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AbstractObjectiveMethodsResultsConclusionThe composition of microbiota which correlates with infiltrating immune cells and clinical signatures is not clarified in CRC.We applied 4 kinds of bioinformatic tools GSVA (version: 1.42.0), ESTIMATE (version: 1.0.13), CIBERSORT (version: 2.0), and immune-related genes.We found that a total of 8 types of microbiotas appeared in the three immune correlation analyses. Among these microbiotas, significant enrichments in relative abundances associated with immune cell infiltration can be found for the dominant phyla Proteobacteria, Firmicutes, and Actinobacteria. Moreover, there existed correlations between some of the 8 microbiotas and clinical-related indicators.We identified some novel microbiotas involved in immune regulation in CRC. [ABSTRACT FROM AUTHOR]