By the insertion of new ligands in the mutated H protein [156], it has been possible to transduce efficiently model cells expressing either CD20 (a marker of B cells), CD8 (a marker of cytotoxic T cells), or EPCAM (a putative marker of early tumor cells [163]) with the same selectivity as reference LV vectors pseudotyped with receptor-targeted measles virus envelope proteins. This evidence concerns the gene ERVW-1 and neoplasm.