Lai et al., when comparing the expression of BAF250a among 79 cases of EAOC (40 CCC; 33 EnOC; 4 serous carcinomas; 1 adenosquamous carcinoma, and 1 adenosarcoma), revealed loss of BAF250a in 37 (47%) cases but without statistical significance among different subtypes. The gene discussed is ARID1A; the disease is serous adenocarcinoma.