Moreover, we first analyzed the expression of KCNE4 at the single-cell levels in different cell types using the TISCH (Tumor Immune Single-cell Hub) database, which revealed that KCNE4 was exclusively highly expressed in fibroblasts and was low or not expressed in immune cells, epithelial cells, and tumor cells (Fig. 4k). Here, KCNE4 is linked to neoplasm.