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MET  mutations leading to exon 14 skipping ( MET Δex14) are strong molecular drivers for non–small‐cell lung cancer (NSCLC). Capmatinib is a highly potent, selective oral MET inhibitor that showed clinically meaningful efficacy and a manageable safety profile in a global phase II study (GEOMETRY mono‐1, NCT02414139) in patients with advanced  MET Δex14‐mutated/ MET ‐amplified NSCLC. We report results of preplanned analyses of 45 Japanese patients according to  MET  status ( MET Δex14‐mutated or  MET ‐amplified) and line of therapy (first‐ [1L] or second‐/third‐line [2/3L]). The starting dose was 400 mg twice daily. The primary endpoint was the objective response rate (ORR) assessed by a blinded independent review committee. A key secondary endpoint was duration of response (DOR). Among  MET Δex14‐mutated patients, in the 1L group, one patient achieved partial response (DOR of 4.24 months) and the other had stable disease. In the 2/3L group, the ORR was 36.4% (95% confidence interval [CI] 10.9%‐69.2%), median DOR was not evaluable, and progression‐free survival was 4.70 months. One patient (2/3L group) showed partial resolution of brain lesions per independent neuroradiologist review. In  MET ‐amplified patients with a  MET  gene copy number of ≥10, the ORR was 100% (2/2 patients) in the 1L group and 45.5% (5/11 patients) in the 2/3L group, with DOR of 8.2 and 8.3 months, respectively. Common treatment‐related adverse events among the 45 Japanese patients were blood creatinine increased (53.3%), nausea (35.6%), and oedema peripheral (31.1%); most were grade 1/2 severity. In conclusion, capmatinib was effective and well tolerated by Japanese patients with  MET Δex14/ MET ‐amplified NSCLC, consistent with the overall population.

Capmatinib in Japanese patients with MET exon 14 skipping–mutated or MET ‐amplified advanced NSCLC: GEOMETRY mono‐1 study