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Phase 1/2 TRIDENT-1 study of repotrectinib in patients with ROS1+ or NTRK plus advanced solid tumorsCho, B. C.; Doebele, R. C.; Lin, J.; Nagasaka, M.; Baik, C.; Van der Wekken, A.; Velcheti, V.; Lee, K. H.; Liu, S.; Solomon, B.; et al. (2021)Introduction: Repotrectinib is a next-generation ROS1/TRK TKI with >90-fold greater potency than crizotinib and entrectinib against ROS1 and >100-fold greater potency than larotrectinib against TRK in engineered Ba/F3 cell proliferation assays. In the Phase 1 portion of TRIDENT-1 study, repotrectinib demonstrated encouraging overall clinical activity in patients (pts) with ROS1 fusion+ NSCLC and TRK fusion+ solid tumors, especially in those pts with ROS1+ NSCLC who are TKI naive. Methods: In Phase 1 portion of the study, the Recommended Phase 2 Dose (RP2D) for repotrectinib was determined to be 160 mg QD for 14 days followed by 160 mg BID if tolerated. Currently, this global trial (Clinical trial information: NCT03093116) is actively enrolling pts whose cancers harbor a ROS1 or NTRK1/2/3 fusion in six phase 2 expansion cohorts (see table). The primary endpoint for the Phase 2 portion is confirmed overall response rate (cORR) by Blinded Independent Central Review (BICR) using RECIST v1.1. An early interim analysis on 39 pts enrolled in Phase 2 was conducted using investigator assessment. Results: Phase 1: Utilizing a 22 July 2019 data cutoff, cORR was 91% by BICR in 11 ROS1 TKI-naïve pts with 5 responses ongoing. The median duration of response (DOR) for the 10 confirmed responders was 23.1 months (95% CI: 5.6enot reached [NR]) and median progression-free survival (PFS) was 24.6 months (95% CI: 7.2 e NR). As of 6 April 2020, with an additional 8.5 months of follow-up, 4 of the 5 previously responding TKI-naïve pts remained in a partial response (PR) per physician assessment data and 7 TKI-naïve pts remained on treatment, range (17.3+ - 34.2+ months). Phase 2: The early Phase 2 TRIDENT-1 dataset utilizing a July 10, 2020 data cutoff includes the first 39 treated pts across six cohorts who have had at least one post-baseline scan. Conclusion: Repotrectinib was well tolerated and continues to demonstrate encouraging overall clinical activity in pts with ROS1 fusion-positive NSCLC and TRK fusion-positive solid tumors. Keywords: repotrectinib TKI-naive response.