The G1202R/Del mutation was detected in 23 pts samples; of which, 15 (65.2%) also harbored EML4-ALK variant 3. ORR was 33.3% (95% CI 16.5-54.0), 75.0% (95% CI 19.4-99.4) and 45.8% (95% CI 25.6-67.2) for variants 1, 2 and 3, respectively, while median DOR was similar for pts with variant 1 or 3 (both 6.9 months)...In this heavily pretreated group of ALK+ NSCLC pts, the presence of an ALK resistance mutation might enrich for EML4-ALK variants 1 and 3. Lorlatinib exhibited antitumor activity irrespective of EML4-ALK variant and across a variety of ALK resistance mutations.