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344 Avelumab + binimetinib in metastatic pancreatic ductal adenocarcinoma (mPDAC): dose-escalation results from the phase 1b/2 JAVELIN PARP MEKi trial
  1. Jordi Rodon1,
  2. Daniel Weng Tan2,
  3. Ignacio Garrido Laguna3,
  4. Wael Harb4,
  5. J Thaddeus Beck5,
  6. Nathan Bahary6,
  7. Sylvie Rottey7,
  8. Zhou Zhu8,
  9. Shibing Deng8,
  10. Karen Kowalski8,
  11. Grainne O’Neill9,
  12. Caimiao Wei10,
  13. Nuzhat Pathan8 and
  14. Wells Messersmith11
  1. 1The University of Texas MD Anderson Cancer Center, Houston, Texas, USA, Houston, TX, USA
  2. 2National Cancer Centre Singapore, Singapore
  3. 3University of Utah Huntsman Cancer Institute, Salt Lake City, Utah, USA, Salt Lake City, UT, USA
  4. 4Horizon Oncology Research, Inc, Lafayette, Indiana, USA, Lafayette, IN, USA
  5. 5Highlands Oncology Group, Fayetteville, Arkansas, USA, Fayetteville, AR, USA
  6. 6UPMC Cancer Pavilion, Pittsburgh, Pennsylvania, USA, Pittsburgh, PA, USA
  7. 7UZ Gent, Gent, Belgium, GENT, Belgium
  8. 8Pfizer, San Diego, California, USA, San Diego, CA, USA
  9. 9Pfizer, Walton Oaks, Surrey, UK, Walton Oaks, UK
  10. 10Pfizer, Groton, Connecticut, USA, Groton, CT, USA
  11. 11University of Colorado Cancer Center, Aurora, Colorado, USA, aurora, CO, USA


Background Preclinical studies of avelumab (anti–PD-L1) + binimetinib (MEK inhibitor [MEKi]) showed encouraging antitumor activity. We report results from the phase 1b JAVELIN PARP MEKi trial (NCT03637491) evaluating avelumab + binimetinib in patients with mPDAC.

Methods Eligible patients had mPDAC and disease progression during or following 1–2 prior lines for advanced or metastatic disease. Patients received avelumab 800 mg intravenously every 2 weeks and binimetinib 30 or 45 mg orally twice daily. The primary endpoint for phase 1b was dose-limiting toxicity (DLT). Secondary endpoints included safety, confirmed objective response per investigator (RECIST 1.1), pharmacokinetics, immunogenicity, and biomarker analyses. PD-L1 expression (SP263 assay) and CD8+ tumor-infiltrating lymphocytes (TILs) in baseline tumor samples were assessed using immunohistochemistry. Molecular alterations were assessed via plasma ctDNA analyses. Blood samples were collected to assess trough concentrations for avelumab, binimetinib, and AR00426032 (binimetinib metabolite) and end-of-infusion concentration for avelumab.

Results 22 patients received avelumab + binimetinib 30 mg (n=10) or 45 mg (n=12); all discontinued treatment. Among 21 DLT-evaluable patients, DLTs occurred in 3/10 (30.0%) in the 30-mg group (mucosal inflammation, dermatitis acneiform, blood creatine phosphokinase increased [n=1 each]) and 5/11 (45.5%) in the 45-mg group (detachment of retinal pigment epithelium, abdominal pain, diarrhea, nausea, vomiting, rash pustular, hypertension, blood creatine phosphokinase increased [n=1 each]). Any-grade treatment-related adverse events (TRAEs) occurred in all 22 patients; grade =3 TRAEs occurred in 8 (80.0%) and 4 (33.3%) in the 30- and 45-mg groups, respectively, most commonly blood creatine phosphokinase increased (n=3 [30.0%], n=2 [16.7%], respectively). No treatment-related deaths occurred. Objective response rates (95% CI) in the 30- and 45-mg groups were 0% (0.0–30.8) and 8.3% (0.2–38.5; 1 partial response), respectively; 1 (10.0%) and 6 (50.0%) had a best overall response of stable disease. Tumor shrinkage was associated with higher baseline PD-L1 expression, higher number of CD8+ TILs, and MEK1/2, PIK3CA, and RNF43 alterations, whereas ERBB4 alterations correlated inversely with tumor size change. Available data indicate that avelumab, binimetinib, and AR00426032 exposures were within range of previous monotherapy studies.

Conclusions This study was terminated before a recommended phase 2 dose was established. In patients with mPDAC who received avelumab + binimetinib, DLTs occurred in both dose groups, although TRAEs were generally consistent with single agent safety profiles. The 45-mg binimetinib dose had a higher number of patients with stable disease and one confirmed partial response. Biomarker findings provide insights into potential mechanisms of treatment resistance and response.

Trial Registration NCT03637491

Ethics Approval The trial was approved by each site’s independent ethics committee.

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