TRDN and neoplasm: Among them, KCNH2 and CALM3 were highly expressed in the tumour group, KCNQ1, SCN5A, ANK2, KCNE1, KCNE2, KCNJ2, CACNA1C, CAV3, SCN4B, AKAP9, SNTA1, KCNJ5, CALM1, CALM2 and TRDN was highly expressed in the normal group (Figure 2A).