Gene expression microarray-based assay to determine tumor site of origin in a series of metastatic tumors to the ovary and peritoneal carcinomatosis of suspected gynecologic origin.

 
"....A combination of Tissue of Origin-Frozen and immunohistochemistry correctly identified the site of origin in 19 of 22 ovarian metastases of known origin. Although conventional pathologic examination and immunohistochemistry are commonly used for assessing the tumor site of origin, Tissue of Origin testing can be useful in difficult cases."