SummaryThe authors recall that gastric neoplasm is very frequent, almost inoperable, and that the after results are desastrous. From the study of 150 cases, they tried to deduce the tactical leading principles to improve the after results of gastrectomy for gastric neoplasm. It seems that female is frequently affected because she represents 30°Qof the total of cancers. The nosological study shows that every man after forty who«feels that he has got a stomach»must be suspected of evoluting neoplasm. The most dangerous cases are those which present the ulcer mask, of which the pains are relieved by feeding. The niche even may disappear at the XRay by filling or scarring of the peptic ulceration of the neoplastic lesion. The same cases otherwise are normal or hyper-chlorydric and that means that gastric intubation helps very little in diagnosis. By examining the future of gastric polypous, the authors reach the conclusion that all become malignant with time and must be extirpated. From rigorous histological criteria, they estimate malignant transformation of the ulcer certain in 10°/aof the cases at least. For the authors, all gastric lesions appearing after forty must be taken in charge by the surgeon : to wait for the clinical confirmation of the cancer means to condemn the patient.