Five-year survival in patients with extensive-stage small cell lung cancer treated with atezolizumab in the Phase III IMpower133 study and the Phase III IMbrella A extension study

作者：Reck M, Dziadziuszko R, Sugawara S, Kao S, Hochmair M, Huemer F, de Castro G Jr, Havel L, Bernabé Caro R, Losonczy G, Lee JS, Kowalski DM, Andric Z, Califano R, Veatch A, Gerstner G, Batus M, Morris S, Kaul M, Cuchelkar V, Li H, Danner BJ, Nabet BY, Liu SV · 发表于：Lung cancer (Amsterdam, Netherlands) · 年份：2024 · DOI：10.1016/j.lungcan.2024.107924 · 研究领域：Antibodies, Monoclonal, Humanized、Small Cell Lung Carcinoma、Lung Neoplasms、Antineoplastic Combined Chemotherapy Protocols、Carboplatin、Humans、Male、Female、Middle Aged、Aged、Neoplasm Staging、Etoposide

OBJECTIVES: IMbrella A is a Phase III extension study that allowed rollover from Roche/Genentech-sponsored atezolizumab trials, including IMpower133, a Phase I/III trial of first-line atezolizumab or placebo plus carboplatin/etoposide in extensive-stage small cell lung cancer. We report outcomes from an exploratory analysis of IMpower133 with extended time-to-event data for patients who rolled over to IMbrella A. MATERIALS AND METHODS: IMpower133 patients could roll over to IMbrella A to receive atezolizumab 1200 mg intravenously every three weeks if they continued to receive atezolizumab at IMpower133 closure or were in survival follow-up after atezolizumab discontinuation. Overall survival and safety were assessed; only serious adverse events and AEs of special interest were collected in IMbrella A. RESULTS: Eighteen of 26 eligible patients rolled over to IMbrella A. At clinical cutoff (March 16, 2023), median follow-up in the atezolizumab plus carboplatin/etoposide arm (IMpower133 and IMbrella A) was 59.4 months. The three-, four-, and five-year overall survival (95 % CI) estimates were 16 % (11 %-21 %), 13 % (8 %-18 %), and 12 % (7 %-17 %), respectively. In IMbrella A, serious adverse events occurred in three patients (16.7 %), and one adverse event of special interest was reported (grade two hypothyroidism). CONCLUSION: This long-term analysis of patients from IMbrella A previously enrolled in IMpower133 provides the first report of five-year overall survival outcomes...