Micro-organisms play roles in colorectal cancer, is it true?

BACKGROUND: Normal gut bacterial floras play a direct or indirect role in the initiation and progression of tumour by inducing chronic inflammation and producing toxins and metabolites. However, data on the types of bacteria that are significant in the sigmoid colon and rectal tumour are still lacking. This study determined the types of bacteria that are associated with the risk of developing sigmoid colon and rectal cancer.