Abstract
Background
Resistance to osimertinib in advanced EGFR-mutated non-small cell lung cancer (NSCLC) constitutes a significant challenge for clinicians either in terms of molecular diagnosis and subsequent therapeutic implications.
Methods
This is a prospective single-centre study with the primary objective of characterising resistance mechanisms to osimertinib in advanced EGFR-mutated NSCLC patients treated both in first- and in second-line. Next-Generation Sequencing analysis was conducted on paired tissue biopsies and plasma samples. A concordance analysis between tissue and plasma was performed.
Results
Sixty-five advanced EGFR-mutated NSCLC patients treated with osimertinib in first- (n = 56) or in second-line (n = 9) were included. We managed to perform tissue and liquid biopsies in 65.5% and 89.7% of patients who experienced osimertinib progression, respectively. Acquired resistance mechanisms were identified in 80% of 25 patients with post-progression samples, with MET amplification (n = 8), EGFR C797S (n = 3), and SCLC transformation (n = 2) the most frequently identified. The mean concordance rates between tissue and plasma for the EGFR activating mutation and for the molecular resistance mechanisms were 87.5% and 22.7%, respectively.
Conclusions
Resistance to osimertinib demonstrated to be highly heterogeneous, with MET amplification the main mechanism. Plasma genotyping is a relevant complementary tool which might integrate tissue analysis for the study of resistance mechanisms.
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Funding
Grant by AIRC (Italian Association for Cancer Research) to TM (grant IG2017-20074).
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MR, AR and TM designed the study. LA, PF, BP, MG, BS and TM enrolled patients and collected the clinical data. CA and FL performed blood sampling. MM, DFM, GD and AL performed tissue sampling. MR, VM, PM, AC, BL, LC, LMS and AR conducted molecular analyses. NR, GL and SEM performed cytological and histological examinations. All the authors contributed to the writing of the manuscript and approved the submitted version.
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Competing interests
LA received speakers’ fee for Astra-Zeneca, MSD, Roche, Sanofi and Takeda. LA has been on advisory board for BeiGene, Novartis and Sanofi. TM received speakers’ and consultants’ fee from Astra-Zeneca, Pfizer, Eli-Lilly, BMS, Novartis, Roche, MSD, Boehringer Ingelheim, Otsuka, Takeda, Pierre Fabre, Amgen, Merck, Sanofi. TM received institutional research grants from Astra-Zeneca and Boehringer Ingelheim. AR received institutional grants from Astra-Zeneca.
Ethics approval and consent to participate
The study was approved from the Local Ethic Committee on the 11th of April, 2018 (Protocol 14033, 09/04/2018). Informed consent was obtained prior to any procedure.
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Leonetti, A., Verzè, M., Minari, R. et al. Resistance to osimertinib in advanced EGFR-mutated NSCLC: a prospective study of molecular genotyping on tissue and liquid biopsies. Br J Cancer 130, 135–142 (2024). https://doi.org/10.1038/s41416-023-02475-9
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DOI: https://doi.org/10.1038/s41416-023-02475-9