Within 60 days prior to, or on the day of the pelvic mass surgery, collect up to 35mL of peripheral blood into one 5mL SST tube, which must be drawn first, followed by three separate 10mL EDTA tubes. Serum from SST tube will be prepared at the local study center and used for protein biomarker testing. The EDTA tubes will be shipped to the Medical University of Vienna, where the blood will be pooled and equal volumes processed using two different separation methods on the Parsortix™ system to capture and harvest rare cells. The harvested material from the EDTA tubes will be lysed, and total RNA will be extracted from the cell lysate for evaluation of multiple gene targets using quantitative PCR (qPCR).