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Determination of the Recommended Phase 2 Dose of birinapant in - - PowerPoint PPT Presentation

Determination of the Recommended Phase 2 Dose of birinapant in combination with pembrolizumab: Results from the dose escalation phase of BPT-201 Russell J.Schilder 1 , Mark Albertella 2 , James Strauss 3 , Malin Sydvander 2 , Dung Le 4 , Stefan


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SLIDE 1

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Determination of the Recommended Phase 2 Dose of birinapant in combination with pembrolizumab: Results from the dose escalation phase of BPT-201

Russell J.Schilder1, Mark Albertella2, James Strauss3, Malin Sydvander2, Dung Le4, Stefan Norin2, Monica Mita5, Emma Boström2, Siqing Fu6, Linda Basse2, Richard Bethell2.

1 Thomas Jefferson University, Philadelphia, PA, USA; 2 Medivir, Stockholm, Sweden; 3 Mary Crowley Cancer

Research, Dallas, TX, USA; 4 John Hopkins, Baltimore, MD, USA; 5 Cedars Sinai Medical Center, Los Angeles, CA, USA; 6 MD Anderson Cancer Center, Houston, TX, USA.

1

CONFIDENTIAL

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SLIDE 2

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

SMAC mimetics exert anti-tumour activity by facilitating apoptotic cell death

  • Inhibitor of Apoptosis proteins (IAPs) play a

critical role in blocking apoptotic signals of the cell death pathways.

  • IAP genes are frequently amplified in multiple

cancers and may contribute to chemoresistance and treatment failure

  • The activity of IAP is regulated by a second

mitochondrial-derived activator of caspases (SMAC), a natural IAP antagonist

  • Birinapant is a bivalent SMAC mimetic,

potently targeting cellular(c) IAP1 for degradation, thereby promoting apoptotic cell death

2

CONFIDENTIAL

Fulda, S.and Vucic, D. Targeting IAP proteins for therapeutic intervention in cancer. Nature Reviews Drug Discovery 2012; 11: 109

Birinapant controls the switch between pro-survival and pro-apoptotic effect of TNF via main target, cIAP1

TNFα

TNFR

cIAP-1 cIAP-1 SMAC Survival Apoptosis

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SLIDE 3

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII CONFIDENTIAL

Birinapant (BPT) is a potent bivalent SMAC mimetic

  • Total of 460 patients have been treated with BPT; 84 as

monotherapy and 376 in combination with other anti- cancer agents

  • Birinapant monotherapy has predictable dose-

dependent PK with a MTD of 47 mg/m2

  • Pharmacodynamic effects are seen at doses well below

MTD (75% reduction of cIAP at 5.6 mg/m2)

  • In a study combining gemcitabine with BPT at doses of

11 - 22 mg/m2 administrated 2 of 3 weeks, the MTD was 22 mg/m2

  • Greater efficacy and durable regressions are observed

in a variety of preclinical tumor models when birinapant is combined with other apoptotic inducing

  • agents. This was confirmed in clinical trials

3

Benetatos CA et al. Birinapant (TL32711), a bivalent SMAC mimetic, targets TRAF2-associated cIAPs, abrogates TNF-induced NF-κB activation, and is active in patient-derived xenograft models. Mol Cancer Ther, 2014; 13(4): 867-79 Amaravadi RK et al. A phase 1 study of the SMAC-memetic birinapant in adults with refractory solid tumors or lymphoma. Mol Cancer Ther 2015; 14(11): 2569-75 Noonan AM et al. Pharmacodynamic markers and clinical results from the phase iI study of the SMAC-mimetic birinapant in women with relapsed plantinum-resistant or refractory epithelial ovarian cancer. Cancer 2016; 122(4): 588-597

  • Birinapant has been generally well tolerated. Most

adverse events were dose-related, transient and mild

  • r moderate in severity
  • Rare cases of following adverse events were

reported

– Bell’s palsy, self-limited; no case at or below 22mg/m2 – Asymptomatic and reversible grade 3 or 4 increases in amylase and lipase – Constellation of AEs including rash, fever, chills, hypotension, nausea, headache, hypophosphatemia without detectable increase in cytokines.

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SLIDE 4

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Potential synergy between birinapant and pembrolizumab

  • Birinapant controls the switch between the pro-

survival and the pro-apoptotic effect of Tumor Necrosis Factor α (TNFα) via degradation of its main target, cIAP1

  • Birinapant preferentially increases alternative

NF-κB signaling and can lead to activation of the immune system

  • PD1 blockade further increases TNFα production

which augments the pro-apoptotic signal of birinapant

  • Synergistic effects of combining birinapant with

immune checkpoint inhibitors have been demonstrated in preclinical models. Based on these observations, this clinical trial with birinapant and pembrolizumab was initiated (NCT02587962)

4

CONFIDENTIAL

Chesi M et al. IAP antagonists induce anti-tumor immunity in multiple myeloma. Nature Medicine 2016; 22(12): 1411-1423 Beug ST et al. Smac mimetics synergize with immune checkpoint inhibitors to promote tumour immunity against glioblastoma. Nature Communications 2017; 8: 14278 Kaerney CJ et al. PD-L1 and IAPs co-operate to protect tumors from cytotoxic lymphocyte-derived TNF. Cell Death Differ 2017; 24(10): 1705-1716

Caspase-8 Caspase-3 Apoptosis

RIP-1 FADD TRADD TRAF2

cIAPs

NF-κB

RIP-1

Cancer cell T-cell

PD-1 PD-L1 TCR Antigen TNFR1 TNFα TNFα

Pembrolizumab

Alternative pathway (Pro-inflammatory) Classical pathway (Pro-survival)

Birinapant

Adapted from Kearney, et al.

Birinapant

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SLIDE 5

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Phase 1/2, multicenter, single-arm, open-label, dose-escalation study of birinapant in combination with pembrolizumab in patients with relapsed

  • r refractory solid tumors (NCT02587962)

5

5

  • 21-day cycle
  • Birinapant (5.6 – 22 mg/m2) IV on days 1 and 8
  • Pembrolizumab 200 mg IV on day 1

CONFIDENTIAL

5.6 mg/m2 Pt 1–3 11 mg/m2 Pt 1–3 17 mg/m2 Pt 1–3 17 mg/m2 Pt 4–6 22 mg/m2 Pt 1–3 22 mg/m2 Pt 4–7

Primary Endpoint: Establishing Safety & Tolerability of a RP2D Secondary Endpoints: Tumor response (RECIST 1.1) Exploratory Endpoints:

  • Multiple Biomarkers including:

PD-L1 and cIAP1 expression, IAP gene copy number, quantification and characterization of Tumor Infiltrating Lymphocytes (TILs) and serum cytokines

  • iRECIST
  • PK of birinapant

3 +3 Dose escalation design

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SLIDE 6

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Key Inclusion Criteria

  • ≥18 years with histologically confirmed solid

malignancy that is metastatic or unresectable and for which standard curative or palliative measures do not exist

  • Measurable disease by RECIST 1.1 criteria
  • Life expectancy greater than 12 weeks
  • Amylase and lipase values < ULN
  • Adequate organ function
  • Resolution of toxic effects from most recent

chemotherapy, radiation therapy or surgery

  • Prior therapy with anti-PD-1, anti-PD-L1, anti-PD-

L2, anti-CD137, anti-CTLA4

  • Prior use of anti-TNF therapies
  • Immune deficiency or use of systemic steroids or

immunosuppressive therapy

  • Active autoimmune disease requiring systemic

treatment

  • Active non-infectious pneumonitis
  • History of interstitial lung disease
  • History of HIV or active hepatitis B or C
  • Live virus vaccination within 30 days
  • Use of blood products or G-CSF within 4 weeks

6

CONFIDENTIAL

Key Exclusion Criteria

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SLIDE 7

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Patient Demographics

Diagnosis Sex Age (years) Number of prior treatment lines Birinapant + Pambrolizumab #Cycles Reason for treatment discontinuation Dose Level 1 5.6 mg/m

2

Sarcoma (spleen) Female 39 4 3 Progression Esophageal adenocarcinoma Female 71 3 6 Progression Colorectal adenocarcinoma (MSS) Male 58 6 27 Active Dose Level 2 11 mg/m2 Rectal cancer (MSS) Male 70 5 4 Progression Ovarian adenocarcinoma Female 69 4 2 Progression Pancreatic adenocarcinoma Female 75 2 3 Progression Dose Level 3 17 mg/m2 Pancreatic cancer Female 64 6 4 Progression Appendiceal cancer Female 68 3 8 Progression Colorectal (MSS/MSI status NA) Female 64 2 3 Progression Sarcoma Female 52 1 9 Withdrawal consent Fallopian tube Female 58 10 2 Unrelated AE Pancreatic Male 55 3 2 Progression Dose Level 4 22 mg/m

2

Liver (neuroendocrine) Female 72 11 Progression Osteosarcoma Male 43 4 9 Active Head and Neck Female 44 1 12 Progression Pancreatic Female 66 2 1 Withdrawal consent Ovarian Female 57 13 6 Progression Pancreatic Male 68 5 1 Progression Colorectal (MSS) Male 64 8 2 Progression 7

CONFIDENTIAL

Median (range) 64 (39-75) 4 (1-13) 3 (1-13)

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SLIDE 8

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Change in tumor burden (%) of target lesions by treatment duration according to RECIST 1.1 (independent Radiologist)

8

CONFIDENTIAL

  • 6
  • 2

2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82

Week in study

  • 50

50

New lesion MSS CRC pancreatic

  • varian

head & neck

  • steosarcoma

neuroendocrine liver sarcoma CRC appendiceal pancreatic pancreatic

  • varian

MSS CRC MSS CRC esophageal cancer sarcoma

Change from baseline (%) 5.6 mg/m2 11 mg/m2 17 mg/m2 22 mg/m2

Patients with at least one post-treatment scan

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SLIDE 9

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Best change in tumor burden (%) of target lesions by RECIST 1.1 (independent radiologist)

9

60 40 20

  • 20
  • 40

Change in tumor burden from baseline (%)

Pancreatic cancer Head & neck cancer Pancreatic cancer MSS CRC Pancreatic cancer MSS rectal cancer Ovarian cancer CRC Ovarian cancer Sarcoma Appendiceal cancer Esophageal cancer Sarcoma Osteosarcoma MSS CRC Neuroendocrine liver

+20% “PD”

  • 30% “PR”

Patients with at least one post-treatment scan

* * *

* Overall response = PD

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SLIDE 10

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

One MSS-CRC patient responding with PR and still active after 27 cycles

10

CONFIDENTIAL

ORR by RECIST 1.1: 5.3 % (1/19) Patient with MSS-CRC Remains on therapy 27+ cycles

Swimmers plot, RECIST 1.1 – independent radiological review (Efficacy data set)

4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 Weeks Pancreatic Pancreatic Pancreatic Ovarian MSS CRC Fallopian tube CRC Sarcoma Esophageal Pancreatic Osteosarcoma Appendiceal Ovarian Sarcoma Head & Neck Neuroendocrine liver MSS CRC Pancreatic MSS CRC PD SD PR Dead In Follow-up Active FU phase Treatment phase

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SLIDE 11

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

  • Most common treatment related AE was grade 2/3 rash reported in 3 out of 19 patients
  • All Level 3 grade 3 AEs occurred in 3 of the 6 patients

Combination of birinapant and pembrolizumab is well tolerated

11

Number of Patients Level 1 5.6 mg Level 2 11 mg Level 3 17 mg Level 4 22 mg (n=3) (n=3) (n=6) (n=7) ≥ grade 3 related AE No events Hypokalemia (1) Maculopapular Rash (1) Diarrhea (1) Increased AST (1) Increased alkaline phosphatase (1) Increased bilirubin (1) Hyponatremia(1) Dehydration (1) Stomatitis (1)* Elevated ALT (1)

On Treatment Related Gr 3 AEs and SAEs

CONFIDENTIAL

* Related SAE

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SLIDE 12

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

AEs Grade 3 or higher and dose modification or death

12

CONFIDENTIAL

One DLT Missed D8 dose due to grade 3 ALT increase in cycle 1 (22 mg/m2) AE’s leading to birinapant dose reduction Grade 3 maculo-papular rash (17 mg/m2) AE’s Leading to treatment discontinuation Grade 2 mucosal inflammation* (17 mg/m2) Grade 3 back pain and dyspnea (17 mg/m2) Grade 3 ascites, bacterial peritonitis, pleural effusion and portal hypertension (22 mg/m2) SAE in 30-day follow-up period Death following hip fracture (unrelated) complicated by pneumonitis (multifactorial though possibly immune related) 20 days after receiving second cycle

* Treatment related

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SLIDE 13

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

AEs of Special Interest

Pembrolizumab: No cases reported of immune- related AEs except for 1 case of pneumonitis considered possibly related

(No colitis, nephritis, hypothyroidism, hyperthyroidism, hypophysitis, hepatitis, pancreatitis, arthritis, type 1 diabetes, skin adverse reactions)

Birinapant:

  • Two patients reported Grade >2

increased lipase (at 5.6 and 17 mg/m2)

  • No cases of Bell’s Palsy
  • No cases of cytokine release

syndrome

13

CONFIDENTIAL

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SLIDE 14

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Predicted plasma concentrations based on monotherapy population PK model and BPT-201 observations

  • All patients were exposed to birinapant
  • Birinapant exposure generally increased with dose in the range 5.6 to 22 mg/m2
  • The vast majority of observations are within the 90% prediction interval based on monotherapy data

14

CONFIDENTIAL

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SLIDE 15

Russell J.Schilder; Thomas Jefferson University, Philadelphia, PA, UsA

GDPR - Level 2 PII

Conclusions

  • Combination of birinapant and pembrolizumab is safe and well tolerated
  • Two patients are still on active combination treatment, one MSS CRC patient who achieved a PR and
  • ne osteosarcoma patient who had PD due to appearance of new lesions (as defined by RECIST 1.1

criteria) but had shrinking target lesions and, therefore, was allowed to stay on study treatment

  • Two patients achieved a PR and seven patients achieved SD as defined by best target lesion response
  • The recommended Phase 2 dose (RP2D) for birinapant is 22 mg/m2 when given in combination with a

fixed dose (200 mg) pembrolizumab

– No major safety issues – No evidence of pembrolizumab effect on birinapant PK

  • Ongoing dose-expansion at RP2D in MSS-CRC patients justified by:

– Encouraging efficacy seen in MSS-CRC – Previous studies with birinapant showed evidence of clinical activity in CRC with reduction in cIAP*

  • Translational data analysis is ongoing

15 CONFIDENTIAL

* Amaravadi RK et al. A phase 1 study of the SMAC-memetic birinapant in adults with refractory solid tumors or lymphoma. Mol Cancer Ther 2015; 14(11): 2569-75 TL32711-POC-078-PTL