Among 17 pts (8 males), median age 49 (range 40-71) with RET fusion+ NSCLC (2 with 450 mg, 13 with 600 mg, 2 with 800 mg), 11 (64%) had been heavily pretreated (≥ 2 prior lines)….The ORR of RET fusion+ NSCLC pts was 41% (95% CI: 18-67%, 7 PRs) and DCR was 82% (95% CI: 56-96%, 7 SDs) by investigators....HA121-28 showed a tolerable safety profile with encouraging efficacy among RET fusion+ NSCLC pts.