Brigatinib in Japanese patients with anaplastic lymphoma kinase (ALK)-positive non-small cell lung cancer (NSCLC): First results from the J-ALTA tyrosine kinase inhibitor (TKI)-naive expansion cohort.

Abstract

9042 Background: Brigatinib is a next-generation ALK inhibitor with demonstrated activity against ALK mutations. We report primary analysis results with brigatinib in Japanese patients with ALK-positive NSCLC who have not previously been treated with an ALK TKI in the phase 2 J-ALTA study (NCT03410108). Methods: J-ALTA, a multi-cohort study, included a TKI-naive expansion cohort. Patients in the TKI-naive cohort received brigatinib 180 mg qd with 7-day lead-in at 90 mg. Primary endpoint was 12-month progression-free survival (PFS) as assessed by an independent-review committee (IRC). Secondary endpoints included confirmed objective response rate (ORR; IRC- and investigator-assessed); IRC-assessed PFS and duration of response (DoR); overall survival (OS); intracranial PFS (iPFS by IRC); and safety. Results: A total of 104 patients were enrolled in the whole study; of these, 32 patients had TKI-naive NSCLC (median age, 60.5 y; 94% had adenocarcinoma; 22% had baseline brain metastases; 25% received prior chemotherapy). As of September 29, 2020, median follow-up was 14.2 months and 27 patients remained on treatment. IRC-assessed 12-month PFS was 93% (90% CI, 79–98). Confirmed ORR was 97% (90% CI, 84–100) by IRC, with 2 complete responses and 29 partial responses. Median DoR as assessed by the IRC was not mature; median PFS, iPFS, and OS were not reached. In the TKI-naive cohort, treatment-emergent adverse events (TEAEs) were reported in all 32 patients (most common: increased creatine phosphokinase, 81%; hypertension, 59%; diarrhea, 47%). Grade ≥3 TEAEs were reported in 91% of patients in this cohort (most common: increased creatinine phosphokinase, 44%; hypertension, 34%; increased lipase, 19%) and 75% of all patients. Three cases (9.4%) of interstitial lung disease/pneumonitis were reported in the TKI-naive cohort; all were grade 1 and occurred after day 15 of brigatinib treatment. Dose discontinuations/interruptions/reductions due to AEs in the TKI-naive cohort were 0%/94%/66%, respectively, and in the total study population were 5%/72%/41%. AE frequency and profile were similar in the TKI-naive and overall cohorts. Conclusions: In the J-ALTA TKI-naive cohort, brigatinib demonstrated substantial efficacy and manageable safety in the Japanese patient population. Brigatinib remains one of the treatment options in Japanese patients. Clinical trial information: NCT03410108.