Abstract
BACKGROUND: Dabrafenib plus trametinib (Dab + Tram) is an approved targeted therapy in patients with BRAF (V600+) mutated metastatic non-small cell lung cancer (NSCLC). Here, we report the efficacy, safety, and quality of life (QoL) results of Dab + Tram treatment in Chinese patients with BRAF (V600E) mutation-positive metastatic NSCLC. METHODS: This is a single-arm, open-label, multicentre, phase II study (NCT04452877). Patients received dabrafenib 150 mg twice daily plus trametinib 2 mg once daily. The primary endpoint was overall response rate (ORR) by central independent review per Response Evaluation Criteria in Solid Tumours (RECIST) 1.1 criteria. Secondary endpoints included ORR by investigator assessment, progression-free survival (PFS), duration of response (DOR), overall survival (OS), safety, tolerability, and QoL. RESULTS: At the data cut-off (March 11, 2021), 18 of 20 enrolled patients were still receiving treatment. The median age was 64 years; majority were female (55%), non-smokers (55%), and had ≥3 metastatic sites (70%). Nine patients received prior anticancer therapy in a therapeutic or metastatic setting. The median duration of follow-up was 5 months. The ORR by both central and investigator assessment was 75% [95% confidence interval (CI): 50.9-91.3%]. The median DOR, PFS, and OS were not reached/estimable at the cut-off date. The most common treatment-related adverse events (AEs) (all grades, in ≥30% of patients) were pyrexia, increased aspartate aminotransferase (AST), decreased neutrophil count, and decreased white blood cell (WBC) count. The self-reported QoL was improved or maintained during the treatment period. CONCLUSIONS: Dab + Tram treatment is safe, effective, and can preserve or improve QoL in majority of Chinese patients with BRAF (V600E) mutation-positive metastatic NSCLC. The results are consistent with the global phase II study.