It can be hypothesized that there should be regions (such as the dUTPase or part of pol) that should be homologous enough to allow confirmation that human breast cancer contain HMTV (e.g., in fluorescence in situ hybridization with gag/pol primers in env-positive breast cancers and breast cancer cell line but not in chromosomes from normal breast cells). The gene discussed is ERVW-1; the disease is breast cancer.