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A. Tan
Author of
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P2.01 - Advanced NSCLC (ID 618)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 10/17/2017, 09:00 - 16:00, Exhibit Hall (Hall B + C)
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P2.01-032 - A Randomized Phase Ii Trial of Selumetinib + Platinum-pemetrexed (Pem-c) in Kras Wildtype (Wt)/Unknown NSCLC: CCTG Ind219 (ID 9083)
09:00 - 09:00 | Author(s): A. Tan
- Abstract
Background:
Selumetinib (SEL), an oral inhibitor of MEK 1 and 2, could be particularly effective in tumours with an activated Ras/Raf/MEK/ERK pathway, but has not been fully studied in KRAS WT nor in the first-line setting. The scheduling of SEL with chemotherapy might impact efficacy and/or toxicity.
Method:
IND219 is an open-label three-arm study of PEM-C±SEL. Arm A: PEM-C+SEL days 2-19; Arm B: PEM-C+SEL days 1-21; Arm C: PEM-C alone. Primary objective was response rate (ORR); secondary objectives were tolerability and progression-free survival (PFS). Pts were stratified by KRAS WT versus unknown and cisplatin versus carboplatin. Before the planned interim analysis (60 pts), pts were allocated 1:1:1 to arm A, B or C, with a plan to continue either Arm A or B plus Arm C a 3:1 ratio to ensure that the final analysis includes Arm A or B and Arm C in a 2:1 ratio. The trial would stop if neither Arm A or B had > 4 responses; if both did, the arm would be selected based on response and toxicity data. Correlative studies included genomic testing.
Result:
Arm A/B/C enrolled 20/21/21 pts. PEM-C exposure was lower with SEL (median cycles 5 versus 6 for Arm C). Seven pts on Arm A (35%; 95% CI 15-59% median duration 3.8m), 13 on Arm B (62%; 95% CI 38-82%; median duration 6.3m), and 5 on Arm C (24%; 95% CI 8-47%; median duration 11.6m) had PR, meeting the criteria to continue. PFS was 7.5m (95% CI 4.0 to 9.0 m) for Arm A, 6.7m (95% CI 4.1 to 8.2 m) on Arm B, and 4.0m on Arm C (95% CI 1.4 to 6.8 m). HR for PFS of Arm A over Arm C was 0.76 (95% CI 0.38 to 1.51, 2-sided p=0.42); HR for PFS of Arm B over Arm C was 0.75 (95% CI 0.37 to 1.54, p=0.43). After adjusting for age, performance status, gender and KRAS, PFS comparisons remained NS. Toxicity was most commonly grade 1-2, but more frequent with SEL especially mucositis, diarrhea, anorexia, dehydration, edema and rash. A high rate of venous thromboembolism (VTE) was seen in all arms, highest in Arm A (Arm A 45 % versus 14 % [p=0.11])
Conclusion:
SEL+PEM-C is associated with higher, but less durable ORR. In this small study, PFS is numerically prolonged adding SEL to PEM-C with expected additive toxicity. Further exploration of these intriguing results is ongoing.
