Abstract 1318P
Background
Sugemalimab (suge) plus platinum-based chemotherapy (chemo) significantly prolonged OS and PFS compared with placebo (pbo) plus chemo in patients (pts) with treatment-naïve, stage IV NSCLC in GEMSTONE-302, a randomized, double-blind, phase 3 study. We report the updated results with approximately 4 years of follow-up.
Methods
Eligible pts were randomized 2:1 to receive suge (1200 mg, IV) or pbo Q3W, plus chemo (squamous [sq] NSCLC: carboplatin+paclitaxel; non-squamous [nsq] NSCLC: carboplatin+pemetrexed) Q3W for up to 4 cycles, followed by maintenance therapy (sq-NSCLC: suge/pbo; nsq-NSCLC: suge/pbo+pemetrexed) for up to 35 cycles. Pts were allowed to continue treatment beyond 35 cycles at the discretion of investigators. Pts in the pbo group were allowed to cross over to receive suge monotherapy upon progressive disease. The primary endpoint was investigator-assessed PFS (INV-PFS), and OS was a key secondary endpoint.
Results
Among 479 pts randomized (suge+chemo, n=320; pbo+chemo, n=159), median time from randomization to data cutoff (May 15, 2023) was 43.5 and 43.0 months, respectively. In the ITT population, median OS was 25.2 months in suge+chemo group versus 16.9 months in pbo+chemo group (HR=0.68 [95% CI, 0.54-0.85]), with estimated 4-year OS rates of 32.1% vs 17.3%. Median INV-PFS was 9.0 months vs 4.9 months (HR=0.49 [95% CI, 0.39-0.60]). Sustained PFS and OS benefits were observed across all subgroups including different tumor histologies and PD-L1 expression levels (Table). Safety profile was consistent with previously reported results.
Table: 1318P
| ITT N=479 | TPS≥50% n=151 | TPS 1-49% n=140 | TPSConclusionsAfter around 4 years of follow-up, suge plus chemo continued to demonstrate prolonged OS and PFS versus pbo plus chemo, irrespective of tumor histology or PD-L1 expression level, without observing increased toxicity. These long-term data continue to support use of suge plus chemo as a standard first-line treatment for metastatic NSCLC. Clinical trial identificationNCT03789604. Editorial acknowledgementMedical writing and editorial assistance were provided by Yuanyuan Feng from CStone Pharmaceuticals. Legal entity responsible for the studyCStone Pharmaceuticals Co., Ltd. FundingCStone Pharmaceuticals. DisclosureC. Zhou: Financial Interests, Personal, Advisory role, Consulting fees: Innovent Biologics, Qilu, Hengrui, TopAlliance Biosciences Inc.; Financial Interests, Personal, Other, Payment or honoraria from: Eli Lilly China, Sanofi, Boehringer Ingelheim, Roche, Merck Sharp & Dohme, Qilu, Hengrui, Innovent Biologics, Alice, C-Stone, LUYE Pharma, TopAlliance Biosciences Inc., Amoy Diagnostics, AnHeart. J. Wang, Q. Wang, B. Wang, H. Dai: Financial Interests, Personal, Full or part-time Employment: CStone Pharmaceuticals; Financial Interests, Personal, Stocks/Shares: CStone Pharmaceuticals. J.J. Yang: Financial Interests, Personal, Full or part-time Employment: CStone Pharmacetuticals; Financial Interests, Personal, Member of Board of Directors: CStone Pharmacetuticals; Financial Interests, Personal, Officer: CStone Pharmacetuticals; Financial Interests, Personal, Stocks/Shares: CStone Pharmacetuticals. All other authors have declared no conflicts of interest. Resources from the same session1260P - Efficacy and safety of sunvozertinib in prior platinum treated NSCLC patients with EGFR exon 20 insertion mutations: Primary analysis from the multinational WU-KONG1B pivotal studyPresenter: Ludovic Doucet Session: Poster session 05 1261P - Efficacy of glecirasib in combination with JAB-3312 as a front-line treatment for patients with KRAS p.G12C mutated NSCLC with PD-L1 expression levels or co-mutationsPresenter: Jie Wang Session: Poster session 05 1262P - Combined molecular analysis of circulating tumour DNA and tumour tissue to identify osimertinib resistancePresenter: Tijmen van der Wel Session: Poster session 05 1263P - Biomarker analysis of plasma samples in YAMATO study: A randomized phase II trial comparing switching treatment of osimertinib following 8 months of afatinib (A) and osimertinib alone (B) in untreated advanced NSCLC patients with common EGFR mutation (TORG1939/WJOG12919L)Presenter: Hiroshige Yoshioka Session: Poster session 05 1264P - Real-world evidence of treatment practices and therapeutic outcomes for newly diagnosed NSCLC patients with non-classical EGFR mutations demonstrates high unmet medical needPresenter: John Heymach Session: Poster session 05 1265P - A promising MET-EGFR bispecific nanobody-drug conjugate therapy for multiple solid tumoursPresenter: xianghai Cai Session: Poster session 05 1266P - Interim analysis from the multicenter ROSE study: Radiation during osimertinib treatment safety and efficacy cohortPresenter: Amanda Tufman Session: Poster session 05 1267P - Sequential afatinib (AFA) to osimertinib (OSI) in EGFR-mutant NSCLC: Primary analysis of Gio-Tag Japan, a multicenter prospective observational studyPresenter: Naoto Takase Session: Poster session 05 1268P - Concordances assessment between MET-positive circulating tumour cells and disease progression in patients with EGFR mutated NSCLCPresenter: Jieun Park Session: Poster session 05 1269P - Preventing infusion-related reactions with intravenous amivantamab: Updated results from SKIPPirr, a phase II studyPresenter: Luis Paz-Ares Session: Poster session 05 This site uses cookies. Some of these cookies are essential, while others help us improve your experience by providing insights into how the site is being used. For more detailed information on the cookies we use, please check our Privacy Policy.
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