Fig. 1

Descriptive analysis between CRC and healthy groups. A Alpha diversity was used to show species abundance of gut bacteria, with A1, A2, A3 and A4 showing Shannon index, Simpson index, Ace index and Chao index, respectively. B The gut bacteria composition between the groups was plotted. The ordinate is the group name, and the abscissa represents the proportion of bacteria in the sample. Different colors represent different bacterial groups, and the length of the column represents the proportion of bacterial groups. C Histograms of the cumulative percentages of the top 30 most abundant bacteria in both groups were plotted. D Red represents the CRC group, blue marks the healthy group, and the overlap is the number of common bacteria in the two groups. The following is a Venn diagram of the total gut bacteria at the genus level for both groups