Prognostic Impact of Histologic Type in Curatively Resected Stage IV Colorectal Cancer: A Japanese Multicenter Retrospective Study

Annals of Surgical Oncology
Junichi ShibataToshiaki Watanabe

Abstract

This study aimed to clarify differences in prognostic factors, metastatic features, and recurrence rates between histologic types in patients with stage 4 colorectal cancer (CRC) who had undergone curative resection. The data from 1131 patients with stage 4 colorectal cancer from the databases of referral institutions were analyzed. The patients were divided into two groups according to histologic types as follows: patients with poorly differentiated adenocarcinoma, mucinous adenocarcinoma, or signet-ring cell carcinoma (Por/Muc/Sig) and patients with well-differentiated or moderately differentiated adenocarcinoma (Wel/Mod). Differences in clinicopathologic features, relapse-free survival (RFS) rates, and cancer-specific survival (CSS) rates between the groups were evaluated. Although RFS did not differ between the Por/Muc/Sig and Wel/Mod groups, CSS was significantly shorter in the Por/Muc/Sig group's than in the Wel/Mod group, and survival after recurrence was significantly worse in the Por/Muc/Sig group than in theWel/Mod group. The incidence of peritoneal or local recurrence was significantly higher for the Por/Muc/Sig patients, whereas the resection recurrence rate was 16.4 %. Multivariate analysis suggested that histologi...Continue Reading

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