Primary tumors of the ovary, oviduct and uterus have epithelial origin.

<p>Immunohistochemistry staining of tumors occurring in the ovary (upper panels), oviduct (middle panels) or endometrium (lower panels). Antibodies to mouse cytokeratin 8 (an epithelial cell marker, left column) and mouse desmin (right column) were used at 1∶50 dilution. Representative images shown. Scale bar −50 µm.</p>