In prostate cancer cells, KCa1.1 amplification is observed in the early stages of carcinogenesis (Ohya et al., 2009; Altintas et al., 2013); however, KCa1.1 was more strongly expressed in metastatic breast cancer tissues than in the primary tumor (Supplementary Figure S3B). This evidence concerns the gene KCNMA1 and prostate cancer.