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目的:病期虽然是影响胃癌预后的主要因素之一，但生物学行为不同的胃癌患者，其预后也大不相同，说明胃癌的生物学行为同样具有重要意义。本研究探讨相同病期下不同生物学行为胃癌患者的临床病理特征，并分析其对预后的影响，为外科治疗提供合理可靠的临床依据。方法:采用回顾性队列研究的方法。收集1980年1月至2012年12月期间，中国医科大学附属第一manbet官网登录 胃肠肿瘤外科行根治性手术的进展期胃癌病例资料。研究对象纳入标准：（1）术后病理证实为进展期胃癌；（2）行根治性手术，均为R 0切除；（3）随访资料完整，无失访。排除标准：（1）既往胃部手术史，术前接受新辅助治疗，术前影像学检查发现有远隔脏器转移；（2）年龄<18岁或>90岁的患者；（3）缺乏临床、病理或随访数据。采用Kaplan-Meier法进行生存分析，Log-rank检验进行预后单因素分析。Cox比例风险回归模型进行预后多因素分析，比较相同病期下不同生物学行为预后的差异。 结果:全组共计2 522例患者，肿瘤TNM分期中，Ⅰ期（ⅠB期，T 2N 0M 0）246例、ⅡA期422例、ⅡB期474例、ⅢA期681例、ⅢB期441例、ⅢC期256例，其5年生存率依次为79.9%、68.5%、56.1%、39.5%、22.5%和8.1%，差异比较有统计学意义（ P<0.001）。预后单因素分析及多因素分析结果显示：（1）Ⅰ期胃癌患者，大体类型为浸润型（HR=1.806，95% CI：1.174~2.780， P=0.007）、生长方式为弥漫型（HR=1.370，95% CI：1.007~1.864， P=0.045）和淋巴管癌栓阳性（HR=2.073，95% CI：1.333~3.224， P=0.001）是影响其预后的独立危险因素；（2）ⅡA期胃癌患者，肿瘤大体类型为浸润型（HR=1.376，95% CI：1.008~1.878， P=0.044）、肿瘤生长方式为弥漫型（HR=1.263，95% CI：1.061~1.505， P=0.009）和淋巴管癌栓阳性（HR=2.296，95% CI：1.753~3.008， P<0.001）为影响其预后的独立危险因素；（3）ⅡB期胃癌患者，大体类型为浸润型（HR=1.445，95% CI：1.056~1.976， P=0.021）和淋巴管癌栓阳性（HR=1.528，95% CI：1.194~1.955， P=0.001）是影响其预后的独立危险因素；（4）ⅢA期胃癌患者，肿瘤大体类型为浸润型（HR=1.395，95% CI：1.095~1.777， P=0.007）、淋巴管癌栓阳性（HR=1.583，95% CI：1.315~1.905， P<0.001）和浆膜分型（腱状型+多彩弥漫型）（HR=1.188，95% CI：1.102~1.282， P<0.001）是影响预后的独立危险因素；（5）ⅢB期胃癌患者，大体类型为浸润型（HR=1.485，95% CI：1.063~2.076， P=0.021）、淋巴管癌栓阳性（HR=1.315，95% CI：1.060~1.631， P=0.013）和浆膜分型（腱状型+多彩弥漫型）（HR=1.146，95% CI：1.052~1.248， P=0.002）是影响预后的独立危险因素；（6）ⅢC期胃癌患者，肿瘤大体类型为浸润型（HR=2.986，95% CI：1.293~6.898， P=0.010）、浆膜分型（腱状型+多彩弥漫型）（HR=1.135，95% CI：1.003~1.283， P=0.045）是影响预后的独立危险因素。 结论:相同TNM分期下，不同的生物学行为其预后大不相同，提示胃癌的生物学行为对患者的预后判断和个体化治疗的指导与病期同样具有重要意义。

Objective:Although stage of disease is one of the main factors affecting the prognosis of gastric cancer, the prognosis of gastric cancer patients with different biological behaviors is also different, indicating that the biological behavior of gastric cancer is also of great significance. This study explores the clinicopathological characteristics of gastric cancer patients with different biological behaviors in the same TMN stage, and analyzes its impact on the prognosis, so as to provide reasonable and reliable evidences for surgical treatment.Methods:A retrospective cohort study was carried out. Clinicopathological data of patients with advanced gastric cancer undergoing radical surgery at Department of Gastrointestinal Surgery, the First Affiliated Hospital of China Medical University from January 1980 to December 2012 were collected. Case inclusion criteria: (1) advanced gastric cancer confirmed by postoperative pathology; (2) R0 resections; (3) complete follow-up data. Exclusion criteria: (1) history of previous gastric surgery, preoperative adjuvant therapy, and imaging evidence of distant metastasis before surgery; (2) age of patients <18 or > 90 years; (3) lack of clinical, pathological, or follow-up data. Cumulative survival was analyzed and plotted by the Kaplan-Meier method. Log-rank test was used for univariate analysis and Cox proportional hazard regression was used for multivariate analysis. Difference of prognosis was compared among different biological behaviors at the same TNM stage.Results:A total of 2522 patients were enrolled, including 246 cases in stage IB (T2N0M0), 422 cases in stage IIA, 474 cases in stage IIB, 681 cases in stage IIIA, 441 cases in stage IIIB, and 256 cases in stage IIIC. Their 5-year survival rates were 79.9%, 68.5%, 56.1%, 39.5%, 22.5%, and 8.1%, respectively, and the difference was statistically significant ( P<0.001). Univariate and multivariate analysis showed that for patients with stage IB gastric cancer, the macroscopic type as infiltration (HR=1.806, 95% CI:1.174-2.780, P=0.007), tissue growth mode as diffusion (HR=1.370, 95% CI:1.007-1.864, P=0.045), and positive lymphovascular cancer embolus (HR=2.073, 95% CI: 1.333-3.224, P=0.001) were independent risk factors of prognosis; for patients with stage IIA gastric cancer, the macroscopic type as infiltration (HR=1.376, 95% CI: 1.008-1.878, P=0.044), tissue growth mode as diffusion (HR=1.263, 95% CI: 1.061-1.505, P=0.009), positive lymphovascular cancer embolus (HR=2.296, 95% CI:1.753-3.008, P<0.001) were independent risk factors of prognosis; for patients with stage IIB gastric cancer, macroscopic type as infiltration (HR=1.445, 95% CI: 1.056-1.976, P=0.021), positive lymphovascular cancer embolus (HR=1.528, 95% CI: 1.194-1.955, P=0.001) were independent risk factors of prognosis; for patients with stage IIIA gastric cancer, macroscopic type as infiltration (HR=1.395, 95% CI: 1.095-1.777, P=0.007), positive lymphovascular cancer embolus (HR=1.583, 95% CI: 1.315-1.905, P<0.001) and serosal type (tendon type+colorful diffusion type) (HR=1.188, 95% CI: 1.102-1.282, P<0.001) were independent risk factors of prognosis; for patients with stage IIIB gastric cancer, macroscopic type as infiltration (HR=1.485, 95% CI: 1.063-2.076, P=0.021), positive lymphovascular cancer embolus (HR=1.315, 95% CI: 1.060-1.631, P=0.013), and serosal type (tendon type+colorful diffusion type) (HR=1.146, 95% CI: 1.052-1.248, P=0.002) were independent risk factors of prognosis; for patients with stage IIIC gastric cancer, macroscopic type as infiltration (HR=2.986, 95% CI: 1.293-6.898, P=0.010) and serosal type (tendon type+colorful diffusion type) (HR=1.135, 95% CI: 1.003-1.283, P=0.045) were independent risk factors of prognosis. Conclusion:Under the same TNM stage, different biological behaviors have very different prognosis, which indicates that the biological behavior of gastric cancer is equally as important as TNM staging for the prognosis of patients and the guidance of individualized treatment.