SIK2 and ovarian cancer: Salt‐inducible kinase 2 (SIK2) is overexpressed in adipocyte‐rich metastases41 and can enhance the expression of FASN (one of the rapid‐limiting enzymes in fatty acid synthesis) and HMGCR (one of key enzymes in cholesterol synthesis) to promote ovarian cancer cell multiplication and metastasis in vitro and in vivo.42