Gastric cancer ranks fifth in both incidence and mortality worldwide, according to the report fromthe Global Cancer Observatory (Globocan) as of 2022 (1). When discussing the global gastric cancerreport, it is assumed that it refers to adenocarcinoma. However, it should be pointed out that themost frequent histological types of gastric cancer are adenocarcinoma and lymphoma, the formerbeing the most frequent on average, accounting for over 95 % of all gastric neoplasms (2). In Peru, theLima Metropolitan Cancer Registry ranked gastric cancer as the third most frequent and the leadingcause of mortality for both sexes (3). On the other hand, the synchronous or metachronous diagnosisof these types of gastric cancer, such as adenocarcinoma and lymphoma, is rare. Metachronouscancer, or second primary cancer, is defined as a new tumor that occurs more than six months afterthe diagnosis of the f...