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Appl. Environ. Microbiol., Sep 1995, 3202-3207, Vol 61, No. 9
Copyright © 1995, American Society for Microbiology

Intestinal floras of populations that have a high risk of colon cancer

WE Moore and LH Moore
Anaerobe Laboratory, Virginia Polytechnic Institute and State University, Blacksburg 24061-0305, USA.

The fecal floras of polyp patients, Japanese-Hawaiians, North American Caucasians, rural native Japanese, and rural native Africans were compared. The polyp patients and Japanese-Hawaiians were considered to be groups at high risk of colon cancer, and the rural native Japanese and rural native Africans were considered to be groups at low risk. The North American Caucasians were found to have a flora composition intermediate between these two groups. Fifteen bacterial taxa from the human fecal flora were significantly associated with high risk of colon cancer, and five were significantly associated with low risk of colon cancer. Total concentrations of Bacteroides species and, surprisingly, Bifidobacterium species were generally positively associated with increased risk of colon cancer. Some Lactobacillus species and Eubacterium aerofaciens, which also produces major amounts of lactic acid, showed closest associations with low risk of colon cancer.

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