Brigatinib (BRG) versus crizotinib (CRZ) in Asian versus non-Asian patients (pts) in the phase III ALTA-1L trial.

Brigatinib (BRG) versus crizotinib (CRZ) in Asian versus non-Asian patients (pts) in the phase III ALTA-1L trial.

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Dr. Sanjay Popat, PhD, disucsses the Phase 3 ALTA-1L sub-analyses. Background: We report an analysis of BRG vs CRZ in Asian vs non-Asian pts with ALK inhibitornaive, ALK+ NSCLC from ALTA-1L (NCT02737501). Methods: Pts were randomized 1:1 to BRG 180 mg QD (7-day lead-in at 90 mg) or CRZ 250 mg BID. Primary endpoint: blinded independent review committee (BIRC)-assessed PFS (RECIST v1.1). Secondary efficacy endpoints: BIRC-assessed ORR, intracranial (i) ORR, and iPFS. Results: 275 pts were randomized; 108 Asian (BRG/CRZ, n = 59/49), 167 non-Asian (n = 78/89); median age: Asian, 55/56 y; non-Asian, 60/60 y. 32/24% of Asians vs 22/28% of non-Asians received prior chemotherapy for advanced disease; 36/33% vs 24/28% had baseline CNS metastases. As of 19 Feb 2018, median follow-up was 10.1/10.0 mo (BRG/CRZ) in Asians vs 11.0/9.0 mo in non-Asians, with 12 vs 20 PFS events in Asians and 24 vs 43 in non-Asians. In Asians, median BIRC-assessed PFS (mo) was not reached (NR; 95% CI 11.2NR) with BRG vs 11.1 (9.2NR) with CRZ (HR 0.41 [95% CI 0.200.86]; log-rank P= 0.0261); in non-Asians, BRG PFS was NR (NR) vs 9.4 (7.3NR) with CRZ (HR 0.54 [0.330.90]; log-rank P= 0.0132) (Table). AE profile of each drug was similar in Asians vs non-Asians. Most common any-grade AEs (?25%) in Asians in BRG arm: diarrhea; elevated blood CPK, ALT, and AST. Discontinuation due to AE (BRG/CRZ): 8.5/6.3% in Asian pts; 14.3/10.1% in non-Asian pts. Conclusions: BRG showed comparable improvement in PFS vs CRZ both in Asians and non-Asians in ALK inhibitornaive ALK+ NSCLC. Clinical trial information: NCT02737501
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