MYLK and cancer: SIK2 protein expression was positively correlated with the expression of MYL2‐pS19 (r = 0.87; Pearson correlation coefficient, P = 0.01) (Fig. 6B) and MYLK‐pS343 (r = 0.83, Pearson correlation coefficient, P = 0.02) (Fig. 6C) in these cancer cell lines.