ESR1 and mucinous adenocarcinoma: A large-scale ovarian tumor tissue analysis consortium study revealed the following HR expression: HGSC (n = 1610) (81% of ER, 31% of PRa, and 16% of no ER and PRa); CCC (n = 354) (19.2% of ER, 7.9% of PRa, and 79% of no ER and PRa); and mucinous carcinoma (n = 185) (20.5% of ER, 15.7% of PRa, and 77% of no ER and PRa) [4].