RT Journal Article SR Electronic T1 Tumor Index as a Combined Indicator of Tumor Depth and Size in Gastric Cancer JF Anticancer Research JO Anticancer Res FD International Institute of Anticancer Research SP 1895 OP 1900 VO 36 IS 4 A1 TAKUMA OHASHI A1 SHUHEI KOMATSU A1 DAISUKE ICHIKAWA A1 TOSHIYUKI KOSUGA A1 KAZUMA OKAMOTO A1 HIROTAKA KONISHI A1 ATSUSHI SHIOZAKI A1 HITOSHI FUJIWARA A1 EIGO OTSUJI YR 2016 UL http://ar.iiarjournals.org/content/36/4/1895.abstract AB Background: We investigated the utility of a novel combined indicator of both tumor depth and size in gastric cancer. Patients and Methods: A total of 938 patients with gastric cancer were analyzed. We tested tumor index (TI), calculated by T category × tumor size (mm) as a novel combined indicator of tumor depth and size. Results: Patients were classified into two groups using a cut-off value of 180 (p<0.0001) by the Kaplan–Meier method. TI was significantly positively correlated with older age, tumor located in the upper third of stomach, advanced type of macroscopic appearance, undifferentiated type, lymphatic invasion, venous invasion, lymph node metastasis, and recurrence. TI>180 only correlated with peritoneal recurrence (p=0.0394). A multivariate analysis identified TI>180 as an independent prognostic factor (hazard ratio=2.38, p=0.0004). Conclusion: TI may be a novel combined indicator of tumor status for predicting a poor prognosis and peritoneal recurrence in gastric cancer.