Gastric cancer: French Intergroup clinical practice guidelines for diagnosis, staging, treatment and follow-up (TNCD, SNFGE, FFCD, UNICANCER, GERCOR, SFCD, SFED, AFEF, SFRO, SFP, SFR, ACHBPT, RENAPE, SNFCP)

Introduction:The updated edition of the French Intergroup guidelines for the management of patients with gastric and gastroesophageal junction adenocarcinoma is a collaborative work of several national medical societies, and available on the website of the French Society of Gastroenterology (SNFGE) (www.tncd.org). Methods:The recommendations are graded into three categories (A, B, and C), based on the level of scientific evidence published until January 2026.Results: Initial staging and risk assessment should include physical evaluation, endoscopy and CT scan of the thorax, abdomen, and pelvis.For resectable disease, endoscopic ultrasonography can be used for T and N staging, while laparoscopic exploration may be performed to exclude occult peritoneal metastases, especially for cT3/cT4 and poorly cohesive tumors.Endoscopic or surgical resection alone is appropriate for very early cT1N0 tumors.For locally advanced disease cT2 and/or cN+, the perioperative FLOT chemotherapy is recommended as the standard of care.Recently, the addition of durvalumab to perioperative FLOT followed by durvalumab maintenance therapy was associated with a significant improvement of survival.For metastatic disease, the first-line chemotherapy is based on platinum-fluoropyrimidine combination.The addition of targeted therapy and/or immunotherapy to doublet chemotherapy depends on the tumor biomarker profile, including HER2 (trastuzumab), claudin18.2(zolbetuximab), PD-L1 and MSI phenotype (anti-PD1 monoclonal antibodies).The addition of docetaxel, based on the triplet TFOX regimen may be considered for selected patients with biomarker-negative tumors.Resection of primary tumor and metastases cannot be recommended but may be considered on an individual basis in highly selected patients with oligometastatic disease who respond to systemic treatment.Various drugs are indicated beyond first-line of treatment, including trastuzumab-deruxtecan for HER2-positive tumors. Conclusion:These national guidelines on gastric cancer are intended to facilitate decision-making in daily clinical practice.These recommendations are subject to ongoing review.Each individual case should be discussed within a multidisciplinary team.