Clinicopathological characteristics of mucinous carcinoma of the colon and rectum

Background and Objectives: Clinicopathological significance of colorectal mucinous carcinoma (MC) remains controversial. The aim of the current study was to investigate the clinicopathological characteristics of colorectal MC. Methods: Eighteen patients with MC and 265 with moderately or well differentiated adenocarcinoma of the colon and rectum, were clinicopathologically compared. Results: MCs occurred in the fight colon significantly more frequently than did non-mucinous carcinomas (NMCs). The maximal size of the tumors in MCs (7.0 ± 2.9 cm) was significantly larger than that in NMCs (5.1 ± 2.1 cm) (P < 0.001). Although the ratio of patients with peritoneal metastasis in MCs (22.2%; 4/18) was significantly higher than that in NMCs (6.0%; 16/265) (P < 0.05), there was no significant difference regarding liver metastasis. The proportion of lymph node metastasis in MCs (72.2%; 13/18) was significantly higher than that in NMCs (44.9%; 119/265) (P < 0.05). There was no significant difference regarding the lymphatic and venous invasion. The 1-, 3-, and 5-year survival rates of patients with MCs were 77.8%, 45.4%, and 30.3%, respectively, and were significantly lower than those in patients with NMCs, that were 88.9%, 65.6%, and 60.8%, respectively (P < 0.05). Conclusions: As colorectal MCs proliferate and metastasize more rapidly than do NMCs, surgeons should realize that more aggressive surgical treatment should be occasionally administered to improve the postoperative prognosis of the patients with colorectal MCs. (C) 2000 Wiley-Liss, Inc.