title: Intestinal bacterial changes of the stool before and after surgery, cancer tissue and adjacent tissue from colorectal cancer patients
design: we selected 8 CRC patients and collected their stool before and after surgery, cancer tissue and adjacent tissue. The bacterial community diversity, phylogenetic analysis and principle component analysis (PCA) were performed. This study provides information about the diversity of the intestinal bacterial community of CRC patients, and is conducive to find maker bacteria of colorectal cancer in the further study.