The impact of TP53 co-mutations and immunologic microenvironment on outcome of lung cancer with EGFR exon 20 insertions.

Background: EGFR exon20 insertions (ex20ins) are targeted by novel compounds in non-small-cell lung cancer (NSCLC). However, data about outcome under conventional therapies and the influence of molecular features are scarce.
Patients and Methods: We retrospectively analysed 118 patients with evaluation of radiologic response based on RECIST v1.1. TP53 status was available for 88 cases.
Results: Platinum doublets and chemoimmunotherapy showed similar response rates (20-25%), disease control rates (80%) and median progression-free survival (mPFS, ≈7 months), which were longer compared to monochemotherapy (9%, 59%, 4.1 months), EGFR inhibitors (0%, 46%, 3.0) and PD-(L)1 inhibitors (0%, 30%, 2.1; p < 0.05). Overall survival (OS) was not dependent on the choice of first-line treatment, but related to more lines of systemic therapy (p < 0.05). TP53 mutations and brain metastases were associated with shorter PFS under platinum doublets and EGFR inhibitors (HR 3.3-6.1, p < 0.01), and shorter OS for patients receiving both treatments (p < 0.05). More tumour CD8 ⁺ and less Th1 cells were associated with longer OS independent of brain and TP53 status (p < 0.01). No difference in outcome was noted according to the ex20ins site and use of pemetrexed (vs. other cytotoxics) or bevacizumab. Long-lasting responses (>1 year) occasionally occurred under EGFR inhibitors for both 'near-' and 'far-loop' variants.
Conclusions: Platinum doublets and chemoimmunotherapy have the highest activity with ORR of 20-25% and mPFS of approximately 7 months, regardless of the cytotoxic partner, while PD-(L)1 inhibitors show limited efficacy. TP53 mutations, brain metastases and a lower tumour CD8/Th1-cell ratio are independently associated with shorter survival.
Competing Interests: Conflict of interest statement PC: research funding from Amgen, AstraZeneca, Boehringer Ingelheim, Novartis, Roche, Takeda, and advisory board/lecture fees from AstraZeneca, Boehringer Ingelheim, Chugai, Daiichi Sankyo, Gilead, Novartis, Pfizer, Roche, Takeda. JR: lecture fees from AstraZeneca, Boehringer Ingelheim. FCS: research funding from Roche; non-financial support from Lilly; personal fees from Takeda, and Pfizer, outside the submitted work. BH: advisory board/lecture fees from AstraZeneca, Boehringer Ingelheim, BMS, MSD, Roche, Pfizer. JK: research funding from AstraZeneca and Celgene. MJ: speaker's honoraria from Roche, Boehringer, and travel grants from Daiichi Sankyo. DK: advisory boards/speakers honoraria from AstraZeneca, BMS, Boehringer Ingelheim, GSK, MSD, Novartis, Pfizer, Roche, Takeda. FE: speaker's honoraria from Roche. FB: research funding from AstraZeneca, BMS and Roche, and travel grants from BMS and MSD. RS: research funding from BMS, and speaker's honoraria from AstraZeneca and Roche. AT: research funding from BMS. MW: research funding from Roche; Personal fees from Roche, AstraZeneca, Boehringer, Kite, Novartis, Merck, BMS, Heidelberg Pharma; Non-financial support from AstraZeneca, BMS, Glenmark; outside the submitted work. SL: advisory board, speaker's honoraria and travel support from BerGenBio, Novartis, Lilly, BMS, MSD, Roche, Celgene, Takeda, AstraZeneca, Sanofi, as well as research funding from Roche, BMS, BerGenBio. WB: consulting fees from AstraZeneca, Boehringer Ingelheim, BMS, Lilly, MSD, Pfizer, Roche, Sanofi, honoraria for lectures from AstraZeneca, Boehringer Ingelheim, BMS, Lilly, MSD, Pfizer, Roche, Sanofi. Travel grants from AstraZeneca, Boehringer Ingelheim, MSD, Roche. CS: advisory board honoraria from AstraZeneca, Boehringer Ingelheim, BMS, MSD, Novartis, Roche, Pfizer, Takeda. Speaker's honoraria from AstraZeneca, Boehringer, Lilly, Roche, MSD, Takeda. DM: advisory board/lecture fees from AstraZeneca, BMS, Boehringer Ingelheim, Lilly, MSD, Novartis, Roche, Sanofi and Takeda (no personal honoraria) NF: advisory board/lecture fees from AbbVie, AstraZeneca, BMS, Boehringer Ingelheim, Pfizer, Roche, MSD, Takeda. JK: advisory board member without receiving any personal fees for Roche Pharma, Boehringer Ingelheim, BMS, MSD, Amgen, Lilly and Takeda. MR: advisory board/lecture fees from Amgen, AstraZeneca, BMS, Boehringer, Lilly, Merck, MSD, Novartis, Pfizer, Roche, Samsung. FG: grants and personal fees from AstraZeneca, Boehringer Ingelheim, BMS, Eli Lilly, MSD, Novartis, Pfizer, Roche, Takeda, as well as personal fees from AbbVie, Tesaro/GSK, Blueprint Medicines, Amgen. CG: advisory board/lecture fees from Amgen, AstraZeneca, BMS, Boehringer Ingelheim, Eli Lilly, Takeda, MSD, Novartis, Pfizer, Roche, AbbVie, Tesaro/GSK and Blueprints Medicines. AS: advisory board honoraria from BMS, AstraZeneca, ThermoFisher, Novartis, speaker's honoraria from BMS, Illumina, AstraZeneca, Novartis, ThermoFisher, MSD, Roche, and research funding from Chugai and BMS. MT: advisory board honoraria from Novartis, Eli Lilly, BMS, MSD, Roche, Celgene, Takeda, AbbVie, Boehringer Ingelheim, Pfizer, speaker's honoraria from Eli Lilly, MSD, Takeda, Pfizer, research funding from AstraZeneca, BMS, Celgene, Novartis, Roche, Takeda, and travel grants from BMS, MSD, Novartis, Boehringer. All remaining authors have declared no conflicts of interest.
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