KRT20 and bladder urachal adenocarcinoma: The urachal adenocarcinoma is generally positive for CK20 and CK7 in 60% of the cases, and for CK34βE12 in 66% of the cases, but only very focally [66,72]; nuclear staining with β-catenin occurs in 6% [66], normally showing only cytomembranous staining.