Introduction: As a novel third-generation EGFR tyrosine kinase inhibitor (TKI), SH-1028 (formerly oritinib) is developed to inhibit both sensitizing EGFR mutations and EGFR T790M mutation.
Methods: This was a multicenter, single-arm, open-label, phase 2 trial (NCT03823807). Eligible patients were those with advanced NSCLC with centrally confirmed EGFR T790M mutation who progressed after first- or second-generation EGFR TKIs or with primary EGFR T790M mutations. Each patient received SH-1028 tablets orally at 200 mg/d until disease progression or intolerable toxicity. Tumor response was evaluated every 6 weeks per the Response Evaluation Criteria in Solid Tumors, version 1.1. The primary end point was objective response rate by an independent review committee. The secondary end points were progression-free survival, overall survival (OS), disease control rate, safety, and so on.
Results: A total of 286 patients with EGFR T790M-positive advanced NSCLC were enrolled in this study, including 59 patients in part A (dose-verification study) and 227 patients in part B (second-line registration study). By data cutoff on September 17, 2021, the independent review committee-assessed objective response rate was 55.9% (95% confidence interval [CI]: 42.4-68.8) in part A and 60.4% (95% CI: 53.7-66.8) in part B. The median progression-free survival was 12.4 months (95% CI: 8.3-20.8) in part A and 12.6 months (95% CI: 9.7-15.3) in part B. The median OS was 26.0 months (95% CI: 23.3-not reached) in part A, and OS was immature in part B. Among the 286 patients, 44 of them experienced at least one grade 3 or higher treatment-related adverse event, with the most common ones as increased serum creatinine phosphokinase level (13 [4.5%]), diarrhea (six [2.1%]), and prolonged QT interval (three [1.0%]). Treatment-related skin rash was reported in 26 patients (9.1%), all grade 1 or 2. There was no interstitial lung disease reported in this study.
Conclusions: SH-1028 is efficacious and tolerable in second-line treatment of patients with advanced NSCLC with positive EGFR T790M.
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