Mieke Van Hemelrijck, Salvatore Grisanti, Avinash Aujayeb, Martin Forster, Giannis Mountzios, Andrea Napolitano, Bruno Vincenzi, Joachim G J V Aerts, Marina Garassino, Valter Torri, Solange Peters, Alex Friedlaender, Alfredo Addeo, Giuseppe Lo Russo, Roberto Ferrara, Diego Signorelli, Alessandro Russo, So Yeon Kim, Jarushka Naidoo, Scott Gettinger, Heather Wakelee, Martin Sebastian, Mark Awad, Abdul Rafeh Naqash, Alessio Cortellini, Raffaele Giusti, Michele De Tursi, Federica Zoratto, Marco Russano, Rita Chiari, Biagio Ricciuti, Andrea De Giglio, Alain Gelibter, Giuseppe Tonini, Amin H Nassar, Alessandra Curioni-Fontecedro, Eleni Karapanagiotou, Emilio Bria, Jack Bell, Paolo Bironzo, Joao V Alessi, Alessandro Morabito, David J Pinato, Francesco Passiglia, Carlo Genova, Francesca Mazzoni, Alessandro Inno, Francesco Grossi, Luca Cantini, Lorenza Landi, Luigi Della Gravara, Margarita Majem, Uma Mukherjee, Federica Biello, Alessandro Leonetti, Annalisa Guida, Marianna Macerelli, Gabriele Minuti, Giulio Metro, Thomas Newsom-Davis, Eleni Josephides, Andrea Camerini, Elisa Roca, David O’Reilly, Mingjia Li, Laura Mezquita, Teresa Gorría, Claudia A M Fulgenzi, Lauren Young, Joel W Neal, Javier Baena, Francesco Pantano, Jacobo Rogado, Mary Jo Fidler, Teresa Beninato, Federica Pecci, Alessandro Di Federico, Kazuki Takada, Leonardo Brunetti, Talal El Zarif, Laura Moliner, Alberto Servetto, Sukumar Kalvapudi, Sai Yendamuri, Edoardo Garbo, Giuseppina Rita Di Fazio, Monica Loza, Ritujith Jayakrishnan, Michele Montrone, Nichola O Awosika, Bartlomiej Tomasik, Maximilian Rost, Isabelle Monnet, Francesco Agustoni, Artur Katz, Dwight Hall Owen, Michele Ghidini, Armida D’Incecco, Gianpaolo Spinelli, Monica Verrico, Manuel Dupont, Rafael Di Marco Barros, Diego Luigi Cortinovis, Chiara Bennati, Frank Aboubakar Nana, Anne-Marie Dingemans, and Taher Abu Hejleh
Background Pembrolizumab monotherapy is an established front-line treatment for advanced non-small cell lung cancer (NSCLC) with programmed cell death-ligand 1 (PD-L1) tumor proportion score (TPS)≥50%. However, real-world data on its long-term efficacy remains sparse.Methods This study assessed 5-year outcomes of first-line pembrolizumab monotherapy in a large, multicenter, real-world cohort of patients with advanced NSCLC and PD-L1 TPS≥50%, referred to as Pembro-real 5Y. Individual patient-level data (IPD) from the experimental arm of the KEYNOTE-024 trial were extracted (KN024 IPD cohort) to compare the long-term outcomes between the two cohorts. To further assess the reproducibility of clinical trial results, we reconstructed the “KN024 look-alike” cohort by excluding patients with an Eastern Cooperative Oncology Group-performance status (ECOG-PS)≥2, those requiring corticosteroids with doses ≥10 mg of prednisolone/equivalent, patients with positive/unknown epidermal growth factor receptor/anaplastic lymphoma kinase genotype, and those with pre-existing autoimmune disease. We additionally provided a hierarchical organization of determinants of long-term benefit through a conditional inference tree analysis.Results The study included 1050 patients from 61 institutions across 14 countries, with a median follow-up of 70.3 months. The 5-year survival rate was 26.9% (95% CI: 23.8% to 30.2%), and median OS was 21.8 months (95% CI: 19.1 to 25.7), while 32 (3.0%) patients who achieved a complete response remained progression-free at the data cut-off. The KN024 look-alike cohort had a 5-year survival rate of 29.3% (95% CI: 25.5% to 33.6%) and a median OS of 27.5 months (95% CI: 22.8 to 31.3). Neither the overall study population nor the KN024 look-alike cohort exhibited significantly different OS compared with the KN024 IPD cohort. By the data cut-off, 1015 patients (96.7%) had permanently discontinued treatment: 659 (64.9%) due to progressive disease, 156 (15.4%) due to toxicity, 77 (7.6%) due to treatment completion, and 106 (10.4%) due to other reasons. Overall, 222 participants (21.1%) were treated for a minimum period of 24 months, among them the 5-year survival rates were: 31.7%, 72.7%, 78.6%, 84.2% for patients who discontinued treatment due to progressive disease, toxicity, treatment completion, and other reasons, respectively.Conclusion This study provides valuable real-world evidence that confirms the long-term efficacy of pembrolizumab outside of clinical trials. Hierarchical organization indicates ECOG-PS, age and PD-L1-TPS as the most important predictors of 5-year survival, potentially informing clinical practice.