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BATLLE-2: KRAS mutation and outcome in a biomarker-integrated study in previously treated patients (pts) with advanced non-small cell lung cancer (NSCLC).
Abstracts that were granted an exception in accordance with ASCO's Conflict of Interest Policy are designated with a caret symbol (^).
Background: BATTLE-2 is building on the personalized medicine approach pioneered in the Biomarker-integrated Approaches of Targeted Therapy for Lung Cancer Elimination (BATTLE-1) trial, and is designed to address mutant KRAS and identify predictive biomarkers for targeted therapies in chemo-refractory pts. Methods: Pts refractory to at least 1 prior therapy, were adaptively randomized (AR), in this phase II, multi-center study, after tumor biopsy and exclusion of sensitizing EGFR mutations (mut+) or ALK fusions to 4 arms: erlotinib (E) 150 mg qd, E plus the AKT inhibitor MK-2206 (M) 135 mg q week, M 100 mg q week plus the MEK inhibitor AZD6244 (A) 100 mg qd, and sorafenib (S) 400 mg bid. The primary objective is 8-week disease control rate (DCR). In Stage 1, 200 pts are randomized and in Stage 2, AR of 200 pts will incorporate the best predictive biomarkers from Stage 1, to be derived from protein expression, gene expression profiling, 16-gene Sequenom mutation analysis and next generation sequencing (NGS) of 182 genes by Foundation Medicine. Results: From 6/2011 to 11/2013, 198 pts randomized to E (22 pts), EM (42 pts), MA (73 pts), S (61 pts). Demographics: Median age 62 (range 22-82); male 48%; ECOG PS 0-1 83%, PS 2 17%; Caucasian 89%, Asian 3%, other 8%; never/former/current smokers 33%/60%/7%; adenocarcinoma 73%, squamous 19%, other NSCLC 8%; prior E 37%, KRAS mut+ 23%, median prior therapies for metastatic NSCLC: 2 (range 1-9). Treatment was well tolerated. With 167 pts evaluable, overall 8-week DCR was 47%, worse with E (20%) than with EM (51%), MA (53%) and S (43%) (Fisher’s exact test p= 0.06, 0.02, and 0.14). For KRAS wild type pts, DCR was worse for E (25%) than all other 3 arms (53%, 50%, and 44%, for EM, MA and S). For KRAS mut+ pts, DCR was highest for MA (61%) (0%, 40%, and 43% for E, EM, and S).Partial responses to MA were seen in 2 pts (KRAS mut+/ ARAF mut+, and CDKN2A/FBXW7/TP53mut+). Conclusions: Improved DCR was observed with EM and MA compared with E. The MA combination is active in KRAS mut+ NSCLC and merits further study. Biomarker analysis is ongoing to define better predictive markers and Stage 2 of BATTLE-2 is being redesigned. (Supported by NCI R01CA155196-01A1). Clinical trial information: NCT01248247.
Abstracts by Vassiliki Papadimitrakopoulou:
Association of epithelial-mesenchymal transition with an immunosuppressive, inflammatory tumor microenvironment with elevated levels of checkpoint inhibitors in lung adenocarcinoma.Meeting: 2015 ASCO Annual Meeting | Abstract No: 3030
Association of inactivation of STK11/ LKB1 with a suppressive immune microenvironment in lung adenocarcinoma (LUAC).Meeting: 2015 ASCO Annual Meeting | Abstract No: 11002Category: Tumor Biology - Immunobiology
Efficacy of rociletinib (CO-1686) in plasma-genotyped T790M-positive non-small cell lung cancer (NSCLC) patients (pts).Meeting: 2015 ASCO Annual Meeting | Abstract No: 8001