CREB1 and ovarian carcinoma: Whereas the above-mentioned studies suggest that PKA-CREB plays a tumor-promoting role in epithelial ovarian cancer, one study suggests that PKA can phosphorylate EZH2 at Thr372 residue, leading to mitochondrial dysfunction, the binding of EZH2 to STAT3 and then inhibiting STAT3 phosphorylation and epithelial ovarian cancer cell growth [102].