Although previous studies have suggested that KLK7 acts as a proliferative factor in a number of cancer types (Kryza et al., 2016; Stefanini et al., 2015; Walker et al., 2014; Xi et al., 2015), in the M74‐D6 and M74‐H melanoma cell lines, KLK7 overexpression surprisingly suppressed cell growth compared to M74‐mock cells (Fig. 6A). This evidence concerns the gene KLK7 and cancer.