RT Journal Article T1 Primary and Acquired Resistance to Immunotherapy in Lung Cancer: Unveiling the Mechanisms Underlying of Immune Checkpoint Blockade Therapy. A1 Boyero, Laura A1 Sánchez-Gastaldo, Amparo A1 Alonso, Miriam A1 Noguera-Uclés, José Francisco A1 Molina-Pinelo, Sonia A1 Bernabé-Caro, Reyes K1 NSCLC K1 PD-1/PD-L1 K1 SCLC K1 immune checkpoint inhibitors K1 immunotherapy K1 lung cancer K1 monoclonal antibodies K1 resistance mechanisms AB After several decades without maintained responses or long-term survival of patients with lung cancer, novel therapies have emerged as a hopeful milestone in this research field. The appearance of immunotherapy, especially immune checkpoint inhibitors, has improved both the overall survival and quality of life of patients, many of whom are diagnosed late when classical treatments are ineffective. Despite these unprecedented results, a high percentage of patients do not respond initially to treatment or relapse after a period of response. This is due to resistance mechanisms, which require understanding in order to prevent them and develop strategies to overcome them and increase the number of patients who can benefit from immunotherapy. This review highlights the current knowledge of the mechanisms and their involvement in resistance to immunotherapy in lung cancer, such as aberrations in tumor neoantigen burden, effector T-cell infiltration in the tumor microenvironment (TME), epigenetic modulation, the transcriptional signature, signaling pathways, T-cell exhaustion, and the microbiome. Further research dissecting intratumor and host heterogeneity is necessary to provide answers regarding the immunotherapy response and develop more effective treatments for lung cancer. SN 2072-6694 YR 2020 FD 2020-12-11 LK https://hdl.handle.net/10668/27496 UL https://hdl.handle.net/10668/27496 LA en DS RISalud RD Apr 17, 2025