• Junichi Shindoh, Xabier de Aretxabala, Thomas A Aloia, Juan Carlos Roa, Ivan Roa, Giuseppe Zimmitti, Milind Javle, Claudius Conrad, Dipen M Maru, Taku Aoki, Luca Vigano, Dario Ribero, Norihiro Kokudo, Lorenzo Capussotti, and Jean-Nicolas Vauthey.
• *Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX †Hepato-biliary-pancreatic Surgery Division, Department of Surgery, Graduate School of Medicine, University of Tokyo, Tokyo, Japan ‡Department of Surgery, Clinica Alemana Santiago, Vitacura, Santiago, Chile §Department of Pathology, Pontificia Universidad Católica, Santiago, Chile ‖Creative Bioscience, Santiago, Chile ¶Department of HPB and Digestive Surgery, Ospedale Mauriziano Umberto I, Turin, Italy **Department of Gastrointestinal Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX ††Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX.
• Ann. Surg. 2015 Apr 1; 261 (4): 733-9.

ObjectiveTo determine the prognostic impact of tumor location in gallbladder cancer.BackgroundDepth of tumor is a strong predictor of survival after curative resection of gallbladder cancer. However, the gallbladder has a unique anatomical relationship with the liver, and the clinical significance of tumor location remains unclear.MethodsFor 437 patients with gallbladder cancer who underwent resection at 4 international institutions, clinicopathologic characteristics and their association with survival were analyzed. Tumor location was defined as "hepatic side" or "peritoneal side," and the prognostic significance of tumor location was evaluated.ResultsAmong the 252 patients with T2 disease, patients with tumors on the hepatic side (T2h, n = 99) had higher rates of vascular invasion, neural invasion, and nodal metastasis than patients with tumors on the peritoneal side (T2p, n = 153) (51% vs 19%, 33% vs 8%, and 40% vs 17%, respectively; P < 0.01 for all). After a median follow-up of 58.9 months, 3-year and 5-year survival rates were 52.1% and 42.6%, respectively, for T2h tumors and 73.7% and 64.7%, respectively, for T2p tumors (P = 0.0006). No such differences were observed in T1 or T3 tumors. Multivariate analysis confirmed the independent association of hepatic-side location with survival in T2 tumors (hazard ratio, 2.7; 95% confidence interval, 1.7-4.2; P < 0.001). This subclassification of T2 tumors predicted recurrence in the liver (23% vs 3%; P = 0.003) and distant lymph nodes (16% vs 3%; P = 0.019) even after radical resection.ConclusionsAfter curative resection of T2 gallbladder cancer, tumor location predicts the pattern of recurrence and survival.

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