HECTD2 and bladder transitional cell carcinoma: [HECTD2-AS]HERVH-1 was not significantly expressed in any sample, but [HECTD2-AS]HERVH-2 was found highly expressed specifically in SKCM and UVM, and [HECTD2-AS]HERVH-3 was expressed in BLCA, as well as healthy bladder and reproductive tissues (Fig. 5B).