[Changes of intestinal microflora in patients with colorectal benign and malignant tumors in high altitude area and comparison with the normal population in low altitude area].

Compared with the high and low altitude controls, the diversity and abundance of intestinal flora in patients with colorectal benign and malignant tumors at high altitudes are different. And the abundance of species are also diffe-rent at the phylum and genus levels, suggesting that altitude factors may have some influence on intestinal flora.