Our previous observation [9] that endometrial serous adenocarcinomas have greater PLAC1 expression levels than do endometrial endometrioid adenocarcinomas is supported in this much smaller panel with the three serous tumors exhibiting an 8.5-fold higher PLAC1 expression than the three endometrioid tumors (P = 0.07). The gene discussed is PLAC1; the disease is endometrial endometrioid adenocarcinoma.