Unfortunately, the role of SK4 in different cells and compartments of the tumour microenvironment, that is in noncancerous cells such as tumour‐associated immune cells, endothelial cells and/or cancer‐associated fibroblasts (CAFs) (Koshy et al., 2013; Xu et al., 2014), could not be tested by the present study due to the lack of a conditional SK4 KO mouse line allowing for the generation of cell‐specific SK4 mutants. The gene discussed is KCNN4; the disease is cancer.