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Canadian Journal of Gastroenterology
Volume 15, Issue 4, Pages 227-230
http://dx.doi.org/10.1155/2001/468125
Original Article

Characteristics of Colorectal Cancer that Produce Positive Immunochemical Occult Blood Test Results on Stool Obtained by Digital Rectal Examination

Hidenori Nakama,1 Bing Zhang,1 ASM Abdul Fattah,1,2 Noboru Kamijo,3 and Xing Zhang1

1Department of Public Health, Shinshu University School of Medicine, Japan
2Department of Internal Medicine, Aizawa Hospital, Japan
3Department of Internal Medicine, Hata Central Hospital, Matsumoto, Japan, Japan

Received 31 March 1999; Accepted 8 January 2001

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

OBEJCTIVE: To clarify the clinicopathological features of colorectal cancer that show positive results on an immunochemical fecal occult blood test of stool obtained by digital rectal examination.

METHODS: In a cross-sectional study, 9952 subjects received both an immunochemical fecal occult blood test of stool obtained by digital rectal examination and colonoscopy annually over a nine-year period of medical checkups; 64 patients with colorectal cancer were identified. The study subjects comprised 39 patients with colorectal cancer who had positive results (positive group) and 25 patients with colorectal cancer who had negative results (negative group) on an immunochemical fecal occult blood test of stool obtained by digital rectal examination. The positive and negative groups were compared in terms of their individual factors, such as site, size, Dukes classification and histological type of the cancer lesions.

RESULTS: The prevalence of rectal cancers was higher in the positive group than in the negative group (P<0.05), but there were no differences between the two groups with respect to any other factors.

CONCLUSIONS: These findings indicate that stool obtained during the digital rectal examination is unsuitable for detecting fecal occult blood, especially for the detection of proximal colon neoplasms.