PAX5 and adenocarcinoma: LuCaP derived from CRPC-adenocarcinoma stained negative for Pax5 expression, whereas only t-NEPC LuCaP PDXs (LuCaP 93, LuCaP 145.1 LuCaP 145.2, and LuCaP 173.1), stained positive for Pax5 expression.