ERVFRD-1 and neoplasm: Syncytin-2 demonstrated a very weak focal protein expression in surface ciliated tubal type epithelial (mucous producing) cells and in some glandular epithelial cells (Fig. 4) All three ERV-env genes demonstrated a moderate to strong protein expression in the cytosolic (Syncytin-1, Syncytin-2 and erv-3) and membrane regions (Syncytin-1, Syncytin-2) of EnCa epithelial glandular cells with no expression in the tumor stroma (n=2) (Fig. 3,4).