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Abstract  Advanced clear cell carcinomas originating from both ovaries and kidneys with cancerous peritonitis have poor prognoses. Murine double‐minute 2 (MDM2) is a potential therapeutic target for clear cell ovarian carcinomas with WT  TP53 . Herein, we characterized the antiangiogenic and antitumor effects of the MDM2 inhibitors DS‐3032b and DS‐5272 in 6 clear cell ovarian carcinoma cell lines and 2 clear cell renal carcinoma cell lines, as well as in clear cell ovarian carcinomas s.c. xenograft and ID8 (murine ovarian cancer cells with WT  TP53 ) cancer peritonitis mouse models. In clear cell ovarian carcinoma s.c. xenograft mouse models, DS‐3032b significantly reduced WT  TP53  clear cell ovarian carcinoma‐ and clear cell renal carcinoma‐derived tumor volumes. In ID8 mouse models, DS‐5272 significantly inhibited ascites production, reduced body weight, and significantly improved overall survival. Additionally, DS‐5272 reduced the tumor burden of peritoneal dissemination and decreased CD31 +  cells in a dose‐dependent manner. Furthermore, DS‐5272 significantly decreased vascular endothelial growth factor concentrations in both sera and ascites. Combined therapy with MDM2 inhibitors and everolimus showed synergistic, and dose‐reduction potential, for clear cell carcinoma treatment. Our findings suggest that MDM2 inhibitors represent promising molecular targeted therapy for clear cell carcinomas, thereby warranting further studies to evaluate the efficacy and safety of dual MDM2/mTOR inhibitors in clear cell carcinoma patients.

Effect of murine double‐minute 2 inhibitors in preclinical models of advanced clear cell carcinomas originating from ovaries and kidneys