SIK2 and breast cancer: We then analyzed the expression levels of SIK2, phosphorylated MYL2 and phosphorylated MYLK in ovarian cancer cell lines (SKOV3, OVCAR8, OVCAR5, OVCAR3 and OVISE) and human breast cancer cell lines (MDA‐MB‐231 and Hs578 t) (Fig. 6A).