COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...

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COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
Cowen & Company’s
      37th Annual Healthcare Conference

                     Stephen Doberstein, PhD
Senior Vice President & Chief Scientific Officer

                                     March 7, 2017
COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
This presentation includes forward-looking statements regarding Nektar’s
proprietary drug candidates, the timing of the start and conclusion of ongoing
or planned clinical trials, the timing and outcome of regulatory decisions,
future availability of clinical trial data, and royalty and milestone revenue
potential. Actual results could differ materially and these statements are
subject to important risks detailed in Nektar's filings with the SEC including the
Form 10-K filed on March 1, 2017. Nektar undertakes no obligation to update
forward-looking statements as a result of new information or otherwise.
COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
Building a Biopharmaceutical Growth Company

 Wholly-Owned Research &                          Revenue Drivers               Integrated R&D, Scale-Up
  Development Pipeline                           Partnered Portfolio               and Manufacturing
                                                                                       Capabilities
Immuno-Oncology
NKTR-214
CD122-biased agonist
Multiple Tumor Types
Combination Trials
                                                                 $375-450M
NKTR-255                                                       Annual Revenue
IL-15                                                             By 2021                R&D Center
                                                                                       San Francisco, CA

NKTR-262
                             Revenue Potential

TLR Agonist

Pain
NKTR-181
Abuse-deterrent Opioid NCE                                                       Manufacturing & Scale-Up Facility
                                                                                          Huntsville, AL
Immunology
NKTR-358
Autoimmune Disease

Cancer Chemotherapy
ONZEALD                                                                               R&D Support Facility
Metastatic Breast Cancer                                                               Hyderabad, India
& Brain Metastases                                                     2021
                                                                                                                     3
COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
Revenue from Partnered Programs Supports
                 Growth of Nektar
                                                                                              $375 - 450M Annual Revenue
                                                                                                        By 2021
                                                                                                                                    PEGPH20
                                                                                                                                    (Halozyme)
                                                                                                                                    Amikacin Inhale
                                                                                                                                    (Bayer)

                                                                                                                                    Cipro DPI
                                                                                                                                    (Bayer)
Milestone Potential
   Royalty And

                                                                                                                                   Onzeald (EU only)
                                                                                                                                   (Daiichi Sankyo)

                                                                                                                                    (Shire)

                                                                                                                                    (AstraZeneca)

               2017                                         2019                                                    2021
   Does not include US revenue for Onzeald. Company estimates, undiscounted.
                                                                                                           Adynovate is a registered trademark of Shire plc.
                                                                               Movantik is a registered trademark of the AstraZeneca group of companies.
                                                                                                                                                               4
COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
NKTR-181: A Novel Opioid Poised to Transform
       the Chronic Pain Market
                                                                               $20 Billion+
                                                                           Global Chronic Pain
        NKTR-181 brings unique properties                                    Therapy Market
         to the treatment of chronic pain:
            Slow rate of entry into CNS designed to   Antidepressants     Antiepileptics
                                                            $1.5B              $3.6B
             reduce euphoria and resulting abuse
             liability
                                                                                             Opioids
            Designed to cause less sedation and                                             $12.6B
                                                                     NSAIDs/COX-2s
             reduce risk of respiratory depression                       $5.9B

            Targeting C-III or better scheduling

            Properties are inherent to molecule
                                                                         Chronic pain market includes:
            Received Fast Track Status from FDA                                Chronic back pain
                                                                                 Osteoarthritis
                                                                                  Fibromyalgia
                                                                                Neuropathic pain

Source: 2013 IMS and Decision Resources                                                                  5
COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
NKTR-181 Development Strategy

           Q1 2017                     Q2 2017                          Q3 2017

                                    Initiate Partnering       Discuss early NDA filing based
    Efficacy Study Ongoing in
    Opioid-naïve Patients with          Discussions              upon efficacy and HAL
                                                                       trial results
      Chronic Low Back Pain              Q2 2017
          Topline Data                                                   2H 2017
           March 2017

  Long-term (52-wk) safety study                              Initiate additional trial(s) with
enrollment complete; 6 & 12-month                            Partner to support expansion of
    exposure requirements met                                      label and/or approval

                                              Topline Data
                                               Mid-2017
       Pivotal Human Abuse
      Liability Study Initiated

                                                                                                  6
COWEN & COMPANY'S 37TH ANNUAL HEALTHCARE CONFERENCE STEPHEN DOBERSTEIN, PHD SENIOR VICE PRESIDENT & CHIEF SCIENTIFIC OFFICER - MARCH 7, 2017 ...
The Immunity Cycle and Multiple Points of
       Intervention for I-O Therapies

                                                                   4. Trafficking of
                                                                   T cells to tumor

                                           3. Priming
                                               and                                              5. Infiltration
                                           activation                                           of T cells into
                                                                                                    tumors

                                     2. Cancer
                                     antigen                                                    6. Recognition
                                     presentation                                               of cancer cells
                                                                                                   by T cells

                                                                                7. Killing of
                                                        1. Release of
                                                                                cancer cells
                                                         cancer cell
                                                          antigens
Source:
Oncology Meets Immunology: The Cancer-Immunity Cycle
Chen and Mellman
Immunity, Volume 39, Issue 1, 1 - 10                                                                              7
Nektar’s Immuno-Oncology Strategy to Create
Therapies that Cover the Immunity Cycle

                                                                 4. Trafficking of T cells
                                                                     to tumor (CTLs)

                       3. Priming and
                                                                                                      5. Infiltration of T
                          activation
                                                                                                       cells into tumors
    Target as         (APCs & T cells)
                                                                                                      (CTLs, endothelial
                                                                                                              cells)
 many steps as                                                                                                                 Therapies
 possible in the                                                                                                               need to be
  cycle with as                                                                                                               accessible as
 few therapies                                                                                                                 medicines
   as possible       2. Cancer
                      antigen
                   presentation                                                                             6. Recognition
                     (dendritic                                                                             of cancer cells
                    cells/APCs)                                                                                by t cells
                                                                                                             (CTLs, cancer
                                                                                                                 cells)

                                         1. Release of cancer                  7. Killing of cancer cells
                                         cell antigens (cancer                  (immune and cancer
                                               cell death)                                cells)

                                                                                                                                              8
Nektar’s Immuno-Oncology Strategy to Create
Therapies that Cover the Immunity Cycle

                                                                 4. Trafficking of T cells
                                                                     to tumor (CTLs)
                                    NKTR-214 (CD122 Agonist)

                       3. Priming and
                                       Prime, Proliferate, Activate &
                          activation    Increase Tumor-Infiltrating 5.cells
                                                                        Infiltration of T
                                                                            into tumors
    Target as         (APCs & T cells)
                                     Lymphocytes (TILs), Increase PD-1 cells)
                                                                      (CTLs, endothelial

 many steps as                                  expression                                                         Therapies
 possible in the                                                                                                   need to be
  cycle with as                                                                                                   accessible as
 few therapies                                                                                                     medicines
   as possible       2. Cancer
                      antigen
                   presentation
                          NKTR-262
                     (dendritic
                                                                               NKTR-255 6.of(IL-15)
                                                                                             Recognition
                                                                                             cancer cells
                    cells/APCs)                                                                     by t cells

                        (TLR Agonist)                                                             (CTLs, cancer
                                                                                                      cells)
                                                                                   Stimulate NK Cells,
                                                                                      Sustain Immune
                       Activate Dendritic
                                                                                Response & Generate
                         Cell Response
                                1. Release of cancer                           7. Killing of cancer cells
                                         cell antigens (cancer                  (immune T Cell    Memory
                                                                                            and cancer
                                               cell death)                               cells)

                                                                                                                                  9
IL-2 is Master Growth Factor for T Cells and
Natural Killer (NK) Cells

 Native IL-2 has
  pleiotropic effects on the                                IL-2
  immune response

 rhIL-2 protein therapy
  (aldesleukin) requires
  high and frequent dosing     b      CTLs                   Tregs    ab
  in ICU which results in           CD8+ T-Cells    CD4+ Regulatory T-Cells
  severe side effects               and NK Cells

                               Stimulates Immune           Down-Regulates
                                 Response to Kill   Proliferation of CD8+ T-cells
                                   Tumor Cells        and Suppresses Immune
                                                              Response

                                                                                    10
NKTR-214: Biasing Action to CD 122, or IL-2R
Beta, to Stimulate T-Cell Production

 Biases signaling to favor
  the CD122 Receptor (IL-                                   NKTR-214
  2Rβγ complex)

 Eliminates over-activation
  of IL-2 pathway that
  results in serious safety    b      CTLs                   Tregs    ab
  issues                            CD8+ T-Cells    CD4+ Regulatory T-Cells
                                    and NK Cells

 Achieves antibody-like
  dosing schedule in
                               Stimulates Immune           Down-Regulates
  outpatient setting             Response to Kill   Proliferation of CD8+ T-cells
                                   Tumor Cells        and Suppresses Immune
                                                              Response

                                                                                    11
NKTR-214 Selectively Grows T Cells, NK Cells in
Tumor Microenvironment in Cancer Patients
      Analysis of T cell Populations in Tumor
                                                      NKTR-214 drives immune
                                                       activation in the tumor
                                                        • Increase in total T cells, NK
440
                                                          and CD8 T cells
  0

                 29.8                                   • No increase in Tregs
330
  0
                                                        • Increase in PD-1 positive CD8
                                                          T cells
220
  0
                                                        • Increase in newly proliferating
                                                          CD8 T cells
110
  0
                                                        • Activation and expression of
                                      1.6
                                                          anti-tumor genes
 00
              CD8
               C D 8                Tregs
                                    T re g s            • Change in T cell clonality in
                                                          the tumor

         Fold change expressed as Week 3 / predose
            Shown are results from N=10 patients
                                                                                          12
BMS and Nektar Clinical Collaboration for
NKTR-214 and Opdivo®

        •   BMS is global leader in immuno-oncology

        •   BMS and Nektar collaborating exclusively on anti-PD1 and IL-
            2-based mechanisms
        •   Companies to conduct Phase 1/2 development of NKTR-214
            and Opdivo in eight or more cancer indications

        •   BMS and Nektar to split clinical costs 50/50

        •   Nektar retains all rights to NKTR-214

        •   Prior to Sept. 2018, if Nektar chooses to partner NKTR-214,
            BMS has right of first negotiation
        •   Nektar retains ability to conduct its own trials of NKTR-214
            with any anti-PD1/PDL1 agents and can collaborate to run
            trials with any other company outside of anti-PD1/PDL1
            mechanisms
                                        Opdivo is a registered trademark of Bristol-Myers Squibb   13
PIVOT Program: NKTR-214 plus Opdivo® with
Eight Expansion Cohorts Planned
             PIVOT-02                                                       PIVOT-04
          Phase 1 Dose Escalation                                    Phase 2 Expansion Cohorts
           (on label indications)                                             Q2 2017
                 N= 30-40
                                                                                   Melanoma
                                                                                  1st line, N=28
                 Melanoma
                     1st line                                                      Melanoma
                                                                     2nd    line I-O relapsed, N=26
                                                                       Renal Cell Carcinoma
        Renal Cell Carcinoma                                            2nd line I-O naïve, N=26
               2nd line I-O naïve                                      Renal Cell Carcinoma
                                                                     2nd    line I-O relapsed, N=26
                                                                                        NSCLC
                    NSCLC                                              2nd     line I-O naïve, N=36
              2nd line I-O naïve                                                        NSCLC                            New
                                                                                                                      Indication
                                                                    2nd     line I-O relapsed, N=26
Initial Dose Combination Arm:                                    Urothelial Carcinoma (Bladder)
Group 1: 0.006 q3w NKTR-214 + 240 mg q2w nivo
q2w and q3w Parallel Dose Combination Arms:                     1st line, cisplatin ineligible, N=44
Group 2: 0.003 q2w NKTR-214 + 240 mg q2w nivo
Group 3: 0.006 q2w NKTR-214 + 240 mg q2w nivo
                                                                          Triple Negative BC
Group 4: 0.003 q3w NKTR-214 + 360 mg q3w nivo                          2nd    line I-O naïve, N= 36
Group 5: 0.006 q3w NKTR-214 + 360 mg q3w nivo
Group 6: 0.009 q3w NKTR-214 + 360 mg q3w nivo (optional)   Opdivo is a registered trademark of Bristol-Myers Squibb           14
NKTR-214 Provides A Central Mechanism to Combine
with Multiple Modalities in Immuno-Oncology

                            Checkpoint
                             Inhibitors

   Vaccines                                 Cell Therapies
                                          (TIL therapy, ECT)
                      NKTR-214:
                     T Cell Growth
                        Factor

              Small Molecules
               (TLR Agonist,
               other targets)                                  15
PROPEL Program: NKTR-214 plus
TECENTRIQ® (atezolizumab)

        PROPEL
    Phase 1 Dose Escalation         NKTR-214 in combination
     (on label indications)
           N= 20-30                  with Roche’s anti-PD-L1
                                     agent, atezolizumab
            NSCLC
  2nd  line – metastatic disease
   with progression following       Nektar sponsored program
  platinum regimen or EGFR or
          targeted therapy
                                     supporting checkpoint
                                     inhibitor combination
  Urothelial Carcinoma               strategy
   2nd line locally advanced or
     metastatic disease with        Study is expected to initiate
      progression following
         platinum regimen            mid-2017

                                                                     16
NKTR-214: Additional Development Programs
  in 2017
                     Initiate triplet combination trial of NKTR-214 with anti-PD-1
                                         and anti-CTLA-4 agents

  Checkpoint
   Inhibitors          Initiate IST in Sarcoma with NKTR-214 and Opdivo® at
                             Memorial Sloan Kettering and MD Anderson

                          Initiate Phase 1 trial of NKTR-214 and TECENTRIQ

  Cell Therapies      Initiate Phase 1/2 trial of NKTR-214 in combination with
(TIL therapy, ECT)
                      Endogenous T Cell regimen in non-small cell lung cancer
                        patients expressing the MAGE-A3 antigen (with MD
                                               Anderson)

     Vaccines        Preclinical studies underway with NKTR-214 and therapeutic
                      tumor vaccines with potential for clinical advancement in
                                                 2017
                                                                                                                       17
                                                            Opdivo is a registered trademark of Bristol-Myers Squibb
Nektar’s Immuno-Oncology Strategy to Create
Therapies That Cover the Immunity Cycle

                                                                 4. Trafficking of T cells

                                    NKTR-214 (CD122 Agonist)         to tumor (CTLs)

                                       Prime, Proliferate, Activate &
                       3. Priming and
                          activation    Increase Tumor-Infiltrating 5.cells
                                                                        Infiltration of T
                                                                            into tumors
    Target as                        Lymphocytes (TILs), Increase PD-1
                      (APCs & T cells)
                                                                      (CTLs, endothelial
                                                                             cells)
 many steps as                                  expression                                                         Therapies
 possible in the                                                                                                   need to be
  cycle with as                                                                                                   accessible as
 few therapies                                                                                                     medicines
   as possible       2. Cancer
                      antigen
                   presentation
                          NKTR-262
                     (dendritic
                                                                                NKTR-2556.of(IL-15)
                                                                                             Recognition
                                                                                             cancer cells
                    cells/APCs)                                                                     by t cells

                        (TLR Agonist)                                                             (CTLs, cancer
                                                                                                      cells)
                                                                                   Stimulate NK Cells,
                                                                                       Sustain Immune
                       Activate Dendritic
                                                                                Response & Generate
                         Cell Response
                                1. Release of cancer                           7. Killing of cancer cells
                                         cell antigens (cancer                  (immune T Cell     Memory
                                                                                            and cancer
                                               cell death)                               cells)

                                                                                                                                  18
NKTR-255: Stimulates Memory T Cell and NK
Cell Activation

 IL-15 delivers T-cell survival
  signal, promotes CD8 memory
  cell formation and activates               NKTR-255 is first
  Natural Killer (NK) cells with           potential medicine to
  minimal CD4 activity                        access the IL-15
   •   Short half-life of native IL-15          pathway by
       requires high and frequent dosing
       with prohibitive side effects        preserving receptor
                                            binding to IL-15Ra
 NKTR-255 designed to
                                             with antibody-like
  overcome native IL-15
  shortcomings                                     dosing

                                                                   19
NKTR-255 Induces Sustained Signaling and Cell
Proliferation In Vivo
                          IL-15                                                                  NKTR-255

       Single dose of NKTR-255 sustains NK and CD8 cell activation
        and proliferation for more than 3 days
       Effect of NKTR-255 also observed on both effector memory
        and central memory CD8 cells

Mice received a single i.v. dose of 0.3 mg/kg NKTR-255 (right) or IL-15 (left), then STAT5 phosphorylation in lymphocyte
subpopulations from whole blood was assessed by flow cytometry.

Source: Poster #342 presented at SITC 2016, National Harbor, Maryland                                                      20
Nektar’s Immuno-Oncology Strategy to Create
Therapies that Cover the Immunity Cycle

                                                                 4. Trafficking of T cells

                                    NKTR-214 (CD122 Agonist)         to tumor (CTLs)

                                       Prime, Proliferate, Activate &
                       3. Priming and
                          activation    Increase Tumor-Infiltrating 5.cells
                                                                        Infiltration of T
                                                                            into tumors
    Target as                        Lymphocytes (TILs), Increase PD-1
                      (APCs & T cells)
                                                                      (CTLs, endothelial
                                                                             cells)
 many steps as                                  expression                                                         Therapies
 possible in the                                                                                                   need to be
  cycle with as                                                                                                   accessible as
 few therapies                                                                                                     medicines
   as possible       2. Cancer
                      antigen
                   presentation
                          NKTR-262
                     (dendritic
                                                                                NKTR-2556.of(IL-15)
                                                                                             Recognition
                                                                                             cancer cells
                    cells/APCs)                                                                     by t cells

                        (TLR Agonist)                                                             (CTLs, cancer
                                                                                                      cells)
                                                                                   Stimulate NK Cells,
                                                                                       Sustain Immune
                       Activate Dendritic
                                                                                Response & Generate
                         Cell Response
                                1. Release of cancer                           7. Killing of cancer cells
                                         cell antigens (cancer                  (immune T Cell     Memory
                                                                                            and cancer
                                               cell death)                               cells)

                                                                                                                                  21
NKTR-262: Adding a Unique Intratumoral TLR
Agonist to Nektar’s Immuno-Oncology Portfolio

                                                        M1           Dendritic
 TLR agonists activate innate                      Macrophage         Cell
  immunity, myeloid cell response and
  increase tumor antigen presentation
                                           NKTR-262
    •   Creates tumor-suppressing micro-    activates
        environment by mimicking local       innate              Present antigens
        infection                          immunity               to prime T Cell

 Nektar technology optimizes                                             CD8+
  specific abscopal effect in tumors                                      T Cell
  without systemic exposure of TLR
  agonist
                                              NKTR-214
 NKTR-262 designed to be highly            proliferates &
  synergistic with NKTR-214                expands T Cells

 NKTR-262 with NKTR-214 represent
  a novel, wholly-owned combination
  regimen in immuno-oncology
                                                                                    22
Complete Regression and Abscopal Effect with
                               Combination of NKTR-262 and NKTR-214
                                  Primary (injected) CT-26 Colon Tumor                                                                                 Dosing
                                                                                                                Primary (injected) Tumor
                               1000
   SEM )

                                                                                                                                NKTR-262
                                                   Vehicle
     

                                                                                                                                NKTR-214
 3
   T u m o r V o lu m e (m m

                                500                                                                     Secondary (non-injected) Tumor      D0                D9           D 18
                                                                                   NKTR-214

                                                  NKTR-262
                                                                                  NKTR-262 + NKTR-214                      Survival CT-26 Colon Tumor
                                  0

                                      0   10               20              30       40     50
                                                                                                                                                   NKTR-262 + NKTR-214
                                               D a y s a f te r fir s t d o s e

                               Secondary (non-injected) CT-26 Colon Tumor
                               1000
                                                                                                                                                                NKTR-214
                                                    Vehicle
  SEM )
   
 3

                                                                                   NKTR-214
  T u m o r V o lu m e (m m

                                500
                                                  NKTR-262
                                                                                                                                                             NKTR-262

                                                                                                                                         Vehicle
                                                                           NKTR-262 + NKTR-214
                                  0
                                      0   10               20              30       40     50

                                           D a y s a f te r fir s t d o s e

NKTR-262 0.8 mg in 40 μL volume given in a single IT dose, NKTR-214 0.8 mg/kg q9dx3 IV; N=10 per group                                                                        23
Overcomes Immune                                                                                                                                                                      Promotes Immune
                                 Suppression                                                                                                                                                                           Activation
                                                                                      % T re g s                                                                                                                                                 % C D 8 T C e lls

                                                                        0
                                                                                 1
                                                                                          2
                                                                                                                         3
                                                                                                                              4
                                                                                                                                                                                                                         0
                                                                                                                                                                                                                                         10
                                                                                                                                                                                                                                                           20
                                                                                                                                                                                                                                                                      30
                                                                                                                                                                                                                                                                                40
                                                                                                                                                                                                                                                                                        50
                                              V                                                                                                                                                   V
                                                  e                                                                                                                                                    e
                                                      h                                                                                                                                                    h
                                                              ic                                                                                                                                               ic
                                                                   le                                                                                                                                               le

                                      N                                                                                                                                                  N
                                          K                                                                                                                                                   K
                                              T                                                                                                                                                   T
                                                  R                                                                                                                                                    R
                                                          -2                                                                                                                                               -2
                                                               1                                                                                                                                                1
                                                                   4                                                                                                                                                4

                                                          T                                                                                                                                                T
                                                              L                                                                                                                                                L
                                                                   R                                                                                                                                                R

                                                                                                                                          % T re g s
                                              C                                                                                                                                                    C
                                                      o
                                                                                                                                                                                                                                                                                                                % C D 8 T C e lls

                                                          m                                                                                                                                            o
                                                               b                                                                                                                                           m
                                                                   o                                                                                                                                            b
                                                                                                                                                                                                                    o

                                                                                                                                                                                                                                                                 % C D11c+ C D8+ D C s
                                                                                                                                                                                                                                                           0
                                                                                                                                                                                                                                                                 10
                                                                                                                                                                                                                                                                           20
                                                                                                                                                                                                                                                                                30
                                                                                                                                                                                                                                                                                      40
                                                                                                                                                                                                                                                                                                               50
                                                                                                                                                                                                                                                                                                                                    60
                                                                                                                                                                                                                                                                                                                                         70

                                          % M a c ro p h a g e s
                                                                                                                                                                                                                                     V
                                                                                                                                                                                                                                         e

                              0
                                              20
                                                                        40
                                                                                 60
                                                                                          80
                                                                                                                                                                                                                                             h
                                                                                                                                                                                                                                                 ic
        V                                                                                                                                                                                                                                             le
            e
                h
                    ic
                         le                                                                                                                                                                                                  N
                                                                                                                                                                                                                                 K
                                                                                                                                                                                                                                     T
N                                                                                                                                                                                                                                        R
    K                                                                                                                                                                                                                                        -2
        T                                                                                                                                                                                                                                         1
            R                                                                                                                                                                                                                                         4
                -2
                     1
                         4
                                                                                                                                                                                                                                                                                                                                                                                              Effects on Distal Tumor

                                                                                                                                                                                                                                             T
                                                                                                                                                                                                                                                 L
                                                                                                                                                                                                                                                      R
                T
                    L
                         R
                                                                                                                                                                                                                                     C
                                                                                                                                                                                                                                         o
                                                                                                                                                                                                                                             m
        C                                                                                                                                                                                                                                         b
            o                                                                                                                                                                                                                                         o
                m
                                                                                                % M a c ro p h a g e s

                     b
                         o
                                                                                                                                                           Combination of
                                                                                                                                                                                                                                                                                                                                              % C D 1 1 c + C D 8 + D e n d r it ic C e lls

                                                                                                                                                       TLR Agonist + NKTR-214

                                                                                 % M o n o c y te s                                                                                                                           % N e u t r o p h ils
                                                                        0
                                                                             2
                                                                                      4
                                                                                            6
                                                                                                                         8
                                                                                                                             10
                                                                                                                                                                                                           0
                                                                                                                                                                                                                         10
                                                                                                                                                                                                                                                 20
                                                                                                                                                                                                                                                            30
                                                                                                                                                                                                                                                                       40
                                                                                                                                                                                                                                                                                 50

                                          V                                                                                                                                      V
                                              e                                                                                                                                      e
                                                  h                                                                                                                                      h
                                                      ic                                                                                                                                     ic
                                                           le                                                                                                                                     le

                                  N                                                                                                                                      N
                                      K                                                                                                                                      K
                                          T                                                                                                                                      T
                                              R                                                                                                                                      R
                                                  -2                                                                                                                                     -2
                                                          1                                                                                                                                   1
                                                              4                                                                                                                                   4

                                                  T                                                                                                                                      T
                                                      L                                                                                                                                      L
                                                           R                                                                                                                                      R

                                          C                                                                                                                                      C
                                                                                                                                  % M o n o c y te s
                                                                                                                                                                                                                                                                                       % N e u t r o p h ils

                                              o                                                                                                                                      o
                                                  m                                                                                                                                      m
                                                          b                                                                                                                                   b
                                                              o                                                                                                                                   o
                                                                                                                                                                                                                                                                                                                                                                                              TLR Agonist + NKTR-214: Synergistic Immune

    24
Auto-Immune Disease is Characterized by
Imbalance of T-Reg Cells to T-Effector Cells

                                         • Current auto-immune
                                           disease therapies work
                       Pathological
                    overpopulation of
                                           by suppressing overall
   Beneficial
 effector T cell
                     antigen-specific      immune system function
                      (self-reactive)
  population
                      effector T cells
                                            – Treat symptoms of the
                                              over-active immune
                                              system
                                            – Do not address
   Insufficient
    T-reg cell
                                              underlying pathology
 population to                              – Block both pathological
   control the                                and beneficial effector T
  pathological
 effector T cells                             cells resulting in
                                              infection, bleeding,
                                              cancer risks, etc.

                                                                          25
NKTR-358: Growing the Body’s Own Population
of T-Reg Cells to Treat Auto-Immune Disease

                          What if you could grow the
                          body’s own population of T-
                           reg cells and directly treat
                             the underlying disease
                                   pathology?
      Restore balance
       and normalize
      T-reg cell and T-
        effector cell
          function

                                                          26
NKTR-358 is Selective for Enhancing of T-Reg
         Proliferation and Activation in Non-Human Primates

                Fold Change in Treg and Teff                                                           T-Reg Activation Markers

                                                     Treg
                                                     Teff

 Dosing                                                                                 Dosing

     •     Single dose NKTR-358 produced greater Treg expansion than repeat low-dose IL-2
     •     In mice, NKTR-358 treatment promotes >30-fold increase in Treg suppressive activity

            NKTR-358 could be a superior approach to treating multiple auto-immune diseases
              including lupus, transplant, rheumatoid arthritis, Crohn’s disease and psoriasis

1M + 1F cynomolgus monkey per treatment, both agents given at 0.025 mg/kg – single dose SC for NKTR-358 vs QDx5 SC for IL-2.      27
NKTR-358 Suppresses Antigen-Driven Inflammation
  in Preclinical Model of Cutaneous Hypersensitivity
        Sensitization (KLH flank)                                                                                Elicitation in ear (with KLH)

                                                                                                                       Measure ear swelling
  Day 0                                                                                                      Day 5

                                                               Cutaneous Hypersensitivity Response
                                                 16
                      (m m , m e a n  S E M )

                                                 14

                                                 12

                                                                                                                                      V e h ic le
                                                 10
                                                                                                                                      N K T R - 3 5 8 , 0 .0 0 3 m g / k g

                                                  8
                                                                                                                                      N K T R - 3 5 8 , 0 .0 1 m g / k g
                       e a r th ic k n e s s

                                                  6                                                                                   N K T R - 3 5 8 , 0 .0 3 m g / k g

                                                                                                                                      N K T R - 3 5 8 , 0 .1 m g / k g
                                                  4
                                                                                                                                     C y c lo s p o r in A , 1 0 m g / k g

                                                  2                                                                                  N K T R - 3 5 8 , 0 .3 m g / k g

                                                  0

                                                      0   24                      48                     72            96

                                                               T im e a f t e r K L H c h a lle n g e (h )

Dosing begun on Day 0: NKTR-358, SC q3d, Cyclosporin A, PO qd N=10                                                                                                           28
NKTR-358 Suppresses Disease Progression in a
Mouse Model of Systemic Lupus Erythematosus

                                               3                                       Protein Levels in Urine

                                                                                                                                                                                               SLE + Vehicle
             P r o t e in L e v e l ( g /L )

                                               2

                                               1

                                                                                                                                                                                               SLE + NKTR-358
                                                                                                                                                                                               Normal Mouse Control

                                               0
                                                                                                                         7

                                                                                                                                   7

                                                                                                                                               7
                                                                                                             7

                                                                                                                                                                               7

                                                                                                                                                                                           7
                                                                             6

                                                                                       6

                                                                                                   6
                                                       6

                                                                                                                                                        7

                                                                                                                                                                     7
                                                                6

                                                                                                                     -1

                                                                                                                                 -1

                                                                                                                                           -1
                                                                                                           -1

                                                                                                                                                                             -1

                                                                                                                                                                                       -1
                                                                         -1

                                                                                     -1

                                                                                               -1
                                                   -1

                                                                                                                                                       -1

                                                                                                                                                                 -1
                                                               -1

                                                                                                                     n

                                                                                                                               n

                                                                                                                                           n
                                                                                                         n
                                                                         c

                                                                                   c

                                                                                               c
                                                   v

                                                                                                                                                                           b

                                                                                                                                                                                       b
                                                            c

                                                                                                                                                    b

                                                                                                                                                                 b
                                                                                                                 a

                                                                                                                             a

                                                                                                                                       a
                                                                                                       a
                                                                     e

                                                                                 e

                                                                                           e
                                               o

                                                           e

                                                                                                                                                                         e

                                                                                                                                                                                   e
                                                                                                                                                   e

                                                                                                                                                             e
                                                                                                                -J

                                                                                                                          -J

                                                                                                                                      -J
                                                                                                    -J
                                                                    -D

                                                                              -D

                                                                                          -D

                                                                                                                                                                      -F

                                                                                                                                                                                  -F
                                                       -D

                                                                                                                                               -F

                                                                                                                                                            -F
                                        -N

                                                                                                             1

                                                                                                                         8

                                                                                                                                   5
                                                                                                   4

                                                                                                                                                                     5

                                                                                                                                                                               2
                                                                                                                                               1

                                                                                                                                                        8
                                                                4

                                                                             1

                                                                                       8
                                                       7
                         0

                                                                                                           1

                                                                                                                     1

                                                                                                                                 2

                                                                                                                                                                 1

                                                                                                                                                                             2
                                                               1

                                                                         2

                                                                                     2
             3

MRL/MpJ-Faslpr model (N=15/group), NKTR-358 given SC twice weekly at 0.3 mg/kg from Week 8 – 20, beginning on 30Nov2016.
Mouse protein levels in urine measured by standard methods. In-life completed on 23Feb2017, additional measures ongoing.

                                                                                                                                                                                                                      29
NKTR-358: Phase 1 Clinical Development in
Systemic Lupus Erythematosis
                  Q1-Q3 2017                                   Q3 2017

                    Phase 1                            Initiate Phase 1b
         Single Ascending Dose Trial in        Multiple Ascending Dose Trial in
                Healthy Subjects                     Lupus (SLE) Patients

         Single SQ Dose of NKTR-358            Multiple SQ Doses of NKTR-358
                   (n ~50)                                 (n ~50)

                                               •    3:1 randomization vs. placebo
     •    Evaluate changes in T-reg            •    Evaluate changes in T-reg cells
          cells (number) and activation             and activation markers
                                               •    Establish P2 doses
          markers (function)
                                                   Data expected in Q3/Q4 2018
     •    Evaluate PK/PD to determine
          dosing for multiple dose trial             Additional Phase 1/2 trials
                                                   in other immune disorders are
           Data expected in Q3 2017                        being explored
                                           •       Allergy              •   Rheumatoid arthritis
                                           •       GVHD                 •   Type-1 diabetes
                                           •       Crohn’s disease      •   Multiple sclerosis
                                           •       Ulcerative colitis   •   Psoriasis
                                                                                                   30
2017 Anticipated Milestones

   First Half of 2017:
     •   Topline data from second Cipro DPI Phase 3 efficacy trial in bronchiectasis (Partner Bayer)
     •   Topline data from NKTR-181 Phase 3 efficacy trial in chronic pain (March)
     •   Initiate first Phase 1 clinical trial in healthy volunteers for NKTR-358 (March)
     •   CHMP opinion regarding conditional market authorization for ONZEALD in Europe (Partner Daiichi Sankyo)(Q2)
     •   Topline data from Amikacin Inhale Phase 3 Program in gram-negative pneumonia (Partner Bayer)(June-July)
     •   Potential European approval and launch for ADYNOVATE™ in hemophilia A (Partner Shire)
     •   Data from PIVOT dose-escalation trial (NKTR-214 with Opdivo) in patients with melanoma, non-small cell lung
         cancer, and renal cell carcinoma (June)

   Second Half of 2017:
     •   Dose first patients in Phase 1 PROPEL dose-escalation trial of NKTR-214 in combination with Tecentriq in patients
         with NSCLC and bladder cancer
     •   Continuing data from PIVOT clinical trial of NKTR-214 with Opdivo in patients with melanoma, non-small cell lung
         cancer, renal cell carcinoma, triple-negative breast cancer, bladder (Ongoing)
     •   Data from Phase 1a clinical trial of NKTR-358
     •   Initiate Phase 1b clinical trial of NKTR-358 in lupus
     •   File IND for immuno-oncology candidate NKTR-262

                                                                                                                             31
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