The drug sensitivity of lapatinib showed a negative correlation with KCNQ1 expression in 100 lung cancer cell lines (r = −0.272, p value = 0.006) (Figure 10I and Supplementary File S5) as well as 464 pan-cancer cell lines (r = −0.187, p value < 0.001) (Figure 10J and Supplementary File S6). Here, KCNQ1 is linked to cancer.