Cancer antigen 125 (CA 125) is a high-molecular-mass glycoprotein that is used as a tumor marker to monitor disease progression and response to therapy and in early detection of recurrence after treatment for ovarian cancer. The Access 2 (Beckman Coulter, Brea, CA), ADVIA Centaur (Bayer Diagnostics, Tarrytown, NY), ARCHITECT i2000 (Abbott Diagnostics, Abbott Park, IL), AxSYM (Abbott Diagnostics...