Abstract
Purpose
Neoadjuvant chemotherapy (NAC) significantly improved the prognosis of patients with locally advanced gastric cancer (LAGC). Several biomarkers, including HER2 and MMR/MSI are crucial for treatment decisions in the advanced stage but, currently, no biomarkers can guide the choice of NAC in clinical practice. Our aim was to evaluate the role of MSI and HER2 status on clinical outcomes.
Methods
We retrospectively collected LAGC patients treated with NAC and surgery +/- adjuvant chemotherapy from 2006 to 2018. HER2 and MSI were assessed on endoscopic and surgical samples. Pathologic complete response (pCR) rate, overall survival (OS), and event‐free survival (EFS) were estimated and evaluated for association with downstaging and MSI.
Results
We included 76 patients, 8% were classified as MSI-H, entirely consistent between endoscopic and surgical samples. Six percent of patients were HER2 positive on endoscopic and 4% on surgical samples. Tumor downstaging was observed in 52.5% of cases, with three pCR (5.1%), none in MSI-H cancers. According to MSI status, event-free survival (EFS) and overall survival (OS) were higher for MSI-H patients to MSS [EFS not reached vs 30.0 months, p = 0.08; OS not reached vs 39.6 months, p = 0.10].
Conclusion
Our work confirms the positive prognostic effect of MSI-H in the curative setting of LAGC, not correlated with pathologic tumor downstaging. Prospective ad-hoc trial and tumor molecular profiling are eagerly needed.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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We acknowledge patients and their families for the participation in the study.
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Dr. LG designed the study, collected data, interpreted data, and wrote the manuscript. Dr. LB and Dr. MB performed molecular and histologic analysis and revised the content. Dr. MIMM collected data and critically revised the intellectual content. Dr. SP, Dr. CAC, Dr. RB and Dr. UFR and Dr. SDP critically revised the intellectual content. Prof. VB and Dr. IMS performed statistical analysis and critically revised the intellectual content. Dr. NF designed the study, interpreted data, and wrote the manuscript.
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The authors state that they have no conflict of interest directly related to this manuscript. Dr. NF reports Personal Financial Interests: advisory Board for MSD, Institutional Financial Interests: Local PI of trials for Astellas, Beigene, Research grants from MSD, Merck and non-financial Interests with ESMO, GI Faculty member.
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Gervaso, L., Bottiglieri, L., Meneses-Medina, M.I. et al. Role of microsatellite instability and HER2 positivity in locally advanced esophago-gastric cancer patients treated with peri-operative chemotherapy. Clin Transl Oncol 25, 3287–3295 (2023). https://doi.org/10.1007/s12094-023-03179-5
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DOI: https://doi.org/10.1007/s12094-023-03179-5