Multiple choice CA 125 is a/an antigen which is frequently expressed by mucinous ovarian carcinomas. useful for ovarian cancer screening in the general patient population. ganglioside mucin-type glycoprotein tumor specific transplantation antigen Reveal answer Fill a bubble to check yourself D Correct answer Explanation CA 125 is a mucin-type glycoprotein which is usually not expressed by mucinous tumors. The antigen (CA 125) is expressed by fetal amniotic and coelomic epithelium.