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MA 02 - Emerging Targets (ID 656)
- Event: WCLC 2017
- Type: Mini Oral
- Track: Clinical Design, Statistics and Clinical Trials
- Presentations: 1
MA 02.07 - A Phase II Study of Pembrolizumab in EGFR Mutant, PD-L1+, Tyrosine Kinase Inhibitor (TKI) Naïve Patients with Advanced NSCLC (ID 9525)
11:00 - 12:30 | Author(s): B. Ledezma
Pembrolizumab, a humanized monoclonal antibody that inhibits the interaction between programmed cell death 1 (PD-1) and programmed death-ligand 1 (PD-L1) has demonstrated significant antitumor activity and produced durable responses in non-small cell lung cancer (NSCLC). However, data to date suggests that responses are less frequent in patients whose tumors harbor mutations in the epidermal growth factor receptor (EGFR) gene. Our single center experience with the KEYNOTE-001 trial suggested that EGFR mutation positive NSCLC patients with a history of prior tyrosine kinase inhibitor (TKI) therapy had worse clinical outcomes than those who were TKI naïve. However, that analysis was limited by small sample size. As a result of this observation, we are currently enrolling an open-label, phase II trial, of front-line pembrolizumab in EGFR mutation positive NSCLC patients that are PD-L1+.
This is an open-label, phase II trial of pembrolizumab in patients with EGFR mutation positive NSCLC whose tumors are PD-L1 positive [>1% tumor membranous staining by immunohistochemistry (IHC), 22C3 pharmDx test in a CLIA certified laboratory]. Patients receive pembrolizumab 200mg by IV infusion every three weeks and are evaluated every 9 weeks +/- 1 week with radiographic imaging to assess response to treatment for a maximum of 35 trial treatments of pembrolizumab. After progression on pembrolizumab, patients are followed for evaluation of EGFR TKI efficacy. The primary end point of the study is objective response rate (ORR) to pembrolizumab, per RECIST 1.1. Secondary endpoints include safety and efficacy [progression-free survival (PFS), overall survival (OS)] of front-line pembrolizumab in this population, as well as efficacy [PFS, OS, ORR] of subsequent EGFR TKI after progression on pembrolizumab. Correlative analyses include whole exome sequencing and IHC of patient specimens. To date, 8 out of the 25 planned patients have been enrolled.
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