Because data on the correlation between SLC family genes and CRC are limited, we first obtained the CRC transcriptome data HTSeq-Counts from the UCSC database, and then used the “Deseq2” package to analyze the differences between tumor tissues and adjacent normal tissues of CRC patients; we set p < 0.05, | log2fc | > 0.5, and obtained 107 upregulated genes and 117 downregulated genes. Here, CCL21 is linked to neoplasm.