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Ref Type Journal Article
PMID (35969830)
Authors André T, Tougeron D, Piessen G, de la Fouchardière C, Louvet C, Adenis A, Jary M, Tournigand C, Aparicio T, Desrame J, Lièvre A, Garcia-Larnicol ML, Pudlarz T, Cohen R, Memmi S, Vernerey D, Henriques J, Lefevre JH, Svrcek M
Title Neoadjuvant Nivolumab Plus Ipilimumab and Adjuvant Nivolumab in Localized Deficient Mismatch Repair/Microsatellite Instability-High Gastric or Esophagogastric Junction Adenocarcinoma: The GERCOR NEONIPIGA Phase II Study.
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Abstract Text In patients with resectable gastric/gastroesophageal junction (GEJ) adenocarcinoma, surgery plus perioperative platinum-based chemotherapy is the standard of care. Perioperative chemotherapy remains debatable for gastric/GEJ adenocarcinoma with deficient mismatch repair (dMMR)/microsatellite instability-high (MSI-H).NEONIPIGA (ClinicalTrials.gov identifier: NCT04006262) phase II study evaluated neoadjuvant nivolumab 240 mg once every two weeks ×6 and ipilimumab 1 mg/kg once every six weeks ×2, followed by surgery and adjuvant nivolumab 480 mg once every four weeks (nine injections) in patients with locally advanced resectable dMMR/MSI-H, clinical (c) tumor (T)2-T4 node (N)x metastasis (M)0 gastric/GEJ adenocarcinoma. The primary end point was a pathological complete response (pCR) rate.Between October 2019 and June 2021, 32 patients with dMMR/MSI-H gastric/GEJ adenocarcinoma were enrolled. The median age was 65.5 years (range, 40-80). Clinical stages were cT2-T3N0 (n = 9), cT2-T3N1 (n = 22), and cT3N1M1 (n = 1, wrongly included). With a median follow-up of 14.9 months (95% CI, 10.6 to 17.6), 32 patients received neoadjuvant immunotherapy (27 patients completed all cycles). Neoadjuvant therapy-related grade 3/4 adverse events occurred in six patients (19%). Twenty-nine patients underwent surgery; three did not have surgery and had complete endoscopic response with tumor-free biopsies and a normal computed tomography scan (two refused surgery and one had metastasis at inclusion). The rate of surgical morbidity (Clavien-Dindo classification) was 55% (one postoperative death occurred). All 29 patients had an R0 resection, and 17 (58.6%; 90% CI, 41.8 to 74.1) had pCR (pathological T0N0). Becker tumor regression grades 1a, 1b, 2, and 3 were observed in 17 patients, three (including two pathological T0N1), two, and seven patients, respectively. Of the 29 patients with surgery, 23 received adjuvant nivolumab. At database lock, no patient had relapse and one died without relapse.Nivolumab and ipilimumab-based neoadjuvant therapy is feasible and associated with no unexpected toxicity and a high pCR rate in patients with dMMR/MSI-H resectable gastric/GEJ adenocarcinoma.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
MSH6 negative gastric adenocarcinoma sensitive Ipilimumab + Nivolumab Phase II Actionable In a Phase II trial (NEONIPIGA), neoadjuvant Opdivo (nivolumab) and Yervoy (ipilimumab) followed by surgery led to a pathological complete response in 58.6% (17/29) of patients with resectable gastric/gastroesophageal junction adenocarcinoma with high microsatellite instability or deficient mismatch repair (dMMR) (defined by loss of MLH1, PMS2, MSH2, or MSH6 expression by IHC), and 30/31 patients in the per-protocol group were alive and progression-free at the time of analysis (PMID: 35969830; NCT0400626). 35969830
MLH1 negative gastroesophageal junction adenocarcinoma sensitive Ipilimumab + Nivolumab Phase II Actionable In a Phase II trial (NEONIPIGA), neoadjuvant Opdivo (nivolumab) and Yervoy (ipilimumab) followed by surgery led to a pathological complete response in 58.6% (17/29) of patients with resectable gastric/gastroesophageal junction adenocarcinoma with high microsatellite instability or deficient mismatch repair (dMMR) (defined by loss of MLH1, PMS2, MSH2, or MSH6 expression by IHC), and 30/31 patients in the per-protocol group were alive and progression-free at the time of analysis (PMID: 35969830; NCT0400626). 35969830
MSH6 negative gastroesophageal junction adenocarcinoma sensitive Ipilimumab + Nivolumab Phase II Actionable In a Phase II trial (NEONIPIGA), neoadjuvant Opdivo (nivolumab) and Yervoy (ipilimumab) followed by surgery led to a pathological complete response in 58.6% (17/29) of patients with resectable gastric/gastroesophageal junction adenocarcinoma with high microsatellite instability or deficient mismatch repair (dMMR) (defined by loss of MLH1, PMS2, MSH2, or MSH6 expression by IHC), and 30/31 patients in the per-protocol group were alive and progression-free at the time of analysis (PMID: 35969830; NCT0400626). 35969830
MLH1 negative gastric adenocarcinoma sensitive Ipilimumab + Nivolumab Phase II Actionable In a Phase II trial (NEONIPIGA), neoadjuvant Opdivo (nivolumab) and Yervoy (ipilimumab) followed by surgery led to a pathological complete response in 58.6% (17/29) of patients with resectable gastric/gastroesophageal junction adenocarcinoma with high microsatellite instability or deficient mismatch repair (dMMR) (defined by loss of MLH1, PMS2, MSH2, or MSH6 expression by IHC), and 30/31 patients in the per-protocol group were alive and progression-free at the time of analysis (PMID: 35969830; NCT0400626). 35969830