The expression level of SLC5A1 mRNA in tumour tissue was significantly higher than that in normal tissue in GSE62165 (P = 0.001, Table 2 and Fig Fig. 2A). The expression level of SLC5A2 mRNA in tumour tissue was significantly lower than that in normal tissue in GSE15471, GSE28735 and GSE62165 (all P < 0.001, Table 2 and Fig. 2B). Here, SLC5A1 is linked to neoplasm.