AIM:To review the clinicopathological characteristics of concurrent gastrointestinal stromal tumors(GISTs) and gastric adenocarcinoma.METHODS:We retrospectively analyzed eight cases of synchronous adenocarcinoma and GIST in the stomach that had been surgically resected with curative intent between March 2003 and December 2008 in Xinhua hospital and Ruijin hospital.The adenocarcinoma was determined to be the primary tumor based on the histological features.The GIST cells were diffusely and strongly positive for CD34 and CD117.RESULTS:The patients were six men and two women aged 47-80 years(average,68.6 years).GIST was preoperatively detected in only one patient.The average sizes of the gastric adenocarcinomas and GISTs were 6.000 ± 2.6186 cm and 1.825 ± 1.4370 cm,respectively.All GISTs were very low-or low-risk lesions that were detected during evaluation,staging,operation or follow-up for gastric adenocarcinoma.CONCLUSION:We hypothesized that the stomach was influenced by the same unknown carcinogen,resulting in a simultaneous proliferation of different cell lines(epithelial and stromal cell). AIM: To review the clinicopathological characteristics of concurrent gastrointestinal stromal tumors (GISTs) and gastric adenocarcinoma. METHODS: We retrospectively analyzed eight cases of synchronous adenocarcinoma and GIST in the stomach that had been surgically resected with curative intent between March 2003 and December 2008 in Xinhua hospital and Ruijin hospital. The adenocarcinoma was determined to be the primary tumor based on the histological features. The GIST cells were diffusely and strongly positive for CD34 and CD117.RESULTS: The patients were six men and two women aged 47-80 years , 68.6 years) .GIST was preoperatively detected in only one patient. The average sizes of the gastric adenocarcinomas and GISTs were 6.000 ± 2.6186 cm and 1.825 ± 1.4370 cm, respectively. All GISTs were very low-or low-risk lesions that were detected during evaluation, staging, operation or follow-up for gastric adenocarcinoma. CONCLUSION: We hypothesized that the stomach was influenced by the same un known carcinogen, resulting in a simultaneous proliferation of different cell lines (epithelial and stromal cell).