Figure S1 gives the levels of LRRC4C expression in tumours and matched normal tissues in all TCGA datasets. The expression of LRRC4C was significantly lower in colon, gastric, glioblastoma multiforme, and breast cancer tissues than in normal tissues. These results confirm the downregulation of the LRRC4C gene in various cancers compared with normal tissues. Here, LRRC4C is linked to breast cancer.