Five-Year Outcomes With Pembrolizumab Versus Chemotherapy for Metastatic Non-Small-Cell Lung Cancer With PD-L1 Tumor Proportion Score ≥ 50.

Purpose: We report the first 5-year follow-up of any first-line phase III immunotherapy trial for non-small-cell lung cancer (NSCLC). KEYNOTE-024 (ClinicalTrials.gov identifier: NCT02142738) is an open-label, randomized controlled trial of pembrolizumab compared with platinum-based chemotherapy in patients with previously untreated NSCLC with a programmed death ligand-1 (PD-L1) tumor proportion score of at least 50% and no sensitizing EGFR or ALK alterations. Previous analyses showed pembrolizumab significantly improved progression-free survival and overall survival (OS).
Methods: Eligible patients were randomly assigned (1:1) to pembrolizumab (200 mg once every 3 weeks for up to 35 cycles) or platinum-based chemotherapy. Patients in the chemotherapy group with progressive disease could cross over to pembrolizumab. The primary end point was progression-free survival; OS was a secondary end point.
Results: Three hundred five patients were randomly assigned: 154 to pembrolizumab and 151 to chemotherapy. Median (range) time from randomization to data cutoff (June 1, 2020) was 59.9 (55.1-68.4) months. Among patients initially assigned to chemotherapy, 99 received subsequent anti-PD-1 or PD-L1 therapy, representing a 66.0% effective crossover rate. Median OS was 26.3 months (95% CI, 18.3 to 40.4) for pembrolizumab and 13.4 months (9.4-18.3) for chemotherapy (hazard ratio, 0.62; 95% CI, 0.48 to 0.81). Kaplan-Meier estimates of the 5-year OS rate were 31.9% for the pembrolizumab group and 16.3% for the chemotherapy group. Thirty-nine patients received 35 cycles (ie, approximately 2 years) of pembrolizumab, 82.1% of whom were still alive at data cutoff (approximately 5 years). Toxicity did not increase with longer treatment exposure.
Conclusion: Pembrolizumab provides a durable, clinically meaningful long-term OS benefit versus chemotherapy as first-line therapy for metastatic NSCLC with PD-L1 tumor proportion score of at least 50%.
Competing Interests: Martin ReckConsulting or Advisory Role: Lilly, MSD Oncology, Merck Serono, Bristol Myers Squibb, AstraZeneca, Boehringer Ingelheim, Pfizer, Novartis, Roche/Genentech, Abbvie, Amgen, Mirati Therapeutics, Samsung BioepisSpeakers' Bureau: Roche/Genentech, Lilly, MSD Oncology, Merck Serono, AstraZeneca, Bristol Myers Squibb, Boehringer Ingelheim, Celgene, Pfizer, Novartis, Amgen, Mirati Therapeutics Delvys Rodríguez-AbreuConsulting or Advisory Role: Roche, Bristol Myers Squibb, MSD, AstraZeneca Spain, NovartisSpeakers' Bureau: Roche, Bristol Myers Squibb, MSDTravel, Accommodations, Expenses: Roche, Bristol Myers Squibb, MSD Andrew G. RobinsonHonoraria: MerckConsulting or Advisory Role: AstraZeneca, Merck, AmgenResearch Funding: AstraZeneca, Merck, Bristol Myers Squibb, Roche Canada Rina HuiHonoraria: Merck Sharp & Dohme, Novartis, Roche, AstraZeneca, Bristol Myers Squibb, Lilly, Pfizer, SeagenConsulting or Advisory Role: Merck Sharp & Dohme, AstraZeneca, Roche, Bristol Myers Squibb, Novartis, Lilly, Pfizer, SeagenResearch Funding: AstraZeneca, Lilly, Novartis, MSD, Roche, Seagen, OncoSecTravel, Accommodations, Expenses: Novartis Tibor CsősziConsulting or Advisory Role: NovartisSpeakers' Bureau: Ipsen, Janssen-CilagTravel, Accommodations, Expenses: Sanofi, Pfizer Andrea FülöpResearch Funding: MSD, AstraZeneca, Janssen Nir PeledHonoraria: AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, MSD, Novartis, Pfizer, Roche, TakedaConsulting or Advisory Role: AstraZeneca, Boehringer Ingelheim, Bristol Myers Squibb, Lilly, MSD, Novartis, Pfizer, RocheResearch Funding: MSD Oncology, Roche/Genentech, AstraZeneca, Takeda, Merck Serono, NovartisTravel, Accommodations, Expenses: Roche/Genentech, MSD Oncology, AstraZeneca, Pfizer Sinead CuffeTravel, Accommodations, Expenses: MSD Oncology, Roche, Pfizer, Bristol Myers Squibb Mary O'BrienHonoraria: Merck, Merck Serono, Abbvie, Bristol Myers SquibbConsulting or Advisory Role: MerckTravel, Accommodations, Expenses: Bristol Myers Squibb Suman RaoHonoraria: Merck, AstraZenecaConsulting or Advisory Role: Galvanize TherapeuticsSpeakers' Bureau: AstraZenecaTravel, Accommodations, Expenses: Merck Katsuyuki HottaHonoraria: AZD, MSD Oncology, Pfizer, Lilly, Taiho Pharmaceutical, Chugai Pharma, TakedaResearch Funding: MSD, Chugai Pharma, Lilly Japan, Bristol Myers Squibb, AZD Ticiana A. LealConsulting or Advisory Role: BeyondSpring Pharmaceuticals, Bristol Myers Squibb, Merck, Takeda, Genentech, InvisionFirst Lung, Novocure, Jazz Pharmaceuticals, AstraZeneca, Bayer, EMD Serono, Boehringer Ingelheim, Blueprint Medicines, Daiichi Sankyo/Lilly, Debiopharm Group, Genentech, LillyTravel, Accommodations, Expenses: Takeda, Abbvie, Bristol Myers Squibb, Genentech, Mirati Therapeutics, AstraZeneca, MerckUncompensated Relationships: Mirati Therapeutics Jonathan W. RiessConsulting or Advisory Role: Medtronic, Boehringer Ingelheim, Novartis, Blueprint Medicines, Genentech, EcoR1 Capital, Teladoc, Daiichi Sankyo, EMD SeronoResearch Funding: Merck, AstraZeneca/MedImmune, Spectrum Pharmaceuticals, Boehringer Ingelheim, Novartis, Revolution Medicines, GlaxoSmithKline Erin JensenEmployment: MerckStock and Other Ownership Interests: Merck Bin ZhaoEmployment: Merck Sharp & DohmeStock and Other Ownership Interests: Merck Sharp & Dohme M. Catherine PietanzaEmployment: MerckStock and Other Ownership Interests: Merck Sharp & Dohme Julie R. BrahmerHonoraria: Roche/GenentechConsulting or Advisory Role: Bristol Myers Squibb, Lilly, Merck, Amgen, Genentech, GlaxoSmithKline, AstraZeneca, Regeneron, SanofiResearch Funding: Bristol Myers Squibb, AstraZeneca, Spectrum Pharmaceuticals, Revolution, RAPT Therapeutics, Genentech/RocheTravel, Accommodations, Expenses: Bristol Myers Squibb, Roche/GenentechOther Relationship: Bristol Myers Squibb, Merck, Janssen OncologyNo other potential conflicts of interest were reported.