KCNN4 and breast neoplasm: In line with the pharmacological blockade of SK4 channels in MMTV‐PyMTtg/+ SK4 WT cells, lack of endogenous SK4 channels attenuated the growth of serum‐restimulated breast tumour cells as well as the antigrowth effects of TRAM‐34 (Fig. 2E,F and Fig. S2B).