ERVW-1 and breast cancer: To estimate whether anti-HERV-K Env antibodies would be effective against breast cancer, two breast cell panels, including cancerous ones (MDA-MB-231, MCF-7, SKBR3, MDA-MB-453, T47D, and ZR-75-1) and non-cancerous (MCF-10A and MCF-10AT), were selected and expression of HERV-K Env was assessed in these cell lines via immunoblot, ELISA, immunofluorescence [144].