Pretreatment Tissue TCR Repertoire Evenness Is Associated with Complete Pathologic Response in Patients with NSCLC Receiving Neoadjuvant Chemoimmunotherapy
Marta Casarrubios, Alberto Cruz-Bermúdez, Ernest Nadal, Amelia Insa, María Del Rosario García Campelo, Martín Lázaro, Manuel Dómine, Margarita Majem, Delvys Rodríguez-Abreu, Alex Martínez-Martí, Javier de Castro-Carpeño, Manuel Cobo, Guillermo López-Vivanco, Edel Del Barco, Reyes Bernabé Caro, Nuria Viñolas, Isidoro Barneto Aranda, Santiago Viteri, Bartomeu Massuti, Miguel Barquín, Raquel Laza-Briviesca, Belén Sierra-Rodero, Edwin R Parra, Beatriz Sanchez-Espiridion, Pedro Rocha, Humam Kadara, Ignacio I Wistuba, Atocha Romero, Virginia Calvo, Mariano Provencio, Marta Casarrubios, Alberto Cruz-Bermúdez, Ernest Nadal, Amelia Insa, María Del Rosario García Campelo, Martín Lázaro, Manuel Dómine, Margarita Majem, Delvys Rodríguez-Abreu, Alex Martínez-Martí, Javier de Castro-Carpeño, Manuel Cobo, Guillermo López-Vivanco, Edel Del Barco, Reyes Bernabé Caro, Nuria Viñolas, Isidoro Barneto Aranda, Santiago Viteri, Bartomeu Massuti, Miguel Barquín, Raquel Laza-Briviesca, Belén Sierra-Rodero, Edwin R Parra, Beatriz Sanchez-Espiridion, Pedro Rocha, Humam Kadara, Ignacio I Wistuba, Atocha Romero, Virginia Calvo, Mariano Provencio
Abstract
Purpose: Characterization of the T-cell receptor (TCR) repertoire may be a promising source for predictive biomarkers of pathologic response to immunotherapy in locally advanced non-small cell lung cancer (NSCLC).
Experimental design: In this study, next-generation TCR sequencing was performed in peripheral blood and tissue samples of 40 patients with NSCLC, before and after neoadjuvant chemoimmunotherapy (NADIM clinical trial, NCT03081689), considering their complete pathologic response (CPR) or non-CPR. Beyond TCR metrics, tissue clones were ranked by their frequency and spatiotemporal evolution of top 1% clones was determined.
Results: We have found a positive association between an uneven TCR repertoire in tissue samples at diagnosis and CPR at surgery. Moreover, TCR most frequently ranked clones (top 1%) present in diagnostic biopsies occupied greater frequency in the total clonal space of CPR patients, achieving an AUC ROC to identify CPR patients of 0.967 (95% confidence interval, 0.897-1.000; P = 0.001), and improving the results of PD-L1 tumor proportion score (TPS; AUC = 0.767; P = 0.026) or tumor mutational burden (TMB; AUC = 0.550; P = 0.687). Furthermore, tumors with high pretreatment top 1% clonal space showed similar immune cell populations but a higher immune reactive gene expression profile. Finally, the selective expansion of pretreatment tissue top 1% clones in peripheral blood of CPR patients suggests also a peripheral immunosurveillance, which could explain the high survival rate of these patients.
Conclusions: We have identified two parameters derived from TCR repertoire analysis that could outperform PD-L1 TPS and TMB as predictive biomarkers of CPR after neoadjuvant chemoimmunotherapy, and unraveled possible mechanisms of CPR involving enhanced tumor immunogenicity and peripheral immunosurveillance.
©2021 The Authors; Published by the American Association for Cancer Research.
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Source: PubMed