In concordance with the data provided in the current study, in a recent study by Hue et. al., which screened 411 human tumor cell lines from the Catalogue Of Somatic Mutations In Cancer (COSMIC) collection, EKVX was found to be positive for a xenotropic MLV-related virus by direct sequencing of viral gag, pol and env genes [8]. This evidence concerns the gene ERVW-1 and neoplasm.