CA 125
Cancer Antigen 125 (CA 125) is a protein often found on the surface of
ovarian cancer cells and in some normal tissues. It is one of the
protein antigens that have been associated with the presence of various
cancers but is most often positive for ovarian cancer. CA 125 levels may
also be high in other types of non-cancerous conditions, including
menstruation, pregnancy, and pelvic inflammatory disease.