{Reference Type}: Journal Article {Title}: Cellular Transformation by Human Cytomegalovirus. {Author}: Herbein G; {Journal}: Cancers (Basel) {Volume}: 16 {Issue}: 11 {Year}: 2024 May 22 {Factor}: 6.575 {DOI}: 10.3390/cancers16111970 {Abstract}: Epstein-Barr virus (EBV), Kaposi sarcoma human virus (KSHV), human papillomavirus (HPV), hepatitis B and C viruses (HBV, HCV), human T-lymphotropic virus-1 (HTLV-1), and Merkel cell polyomavirus (MCPyV) are the seven human oncoviruses reported so far. While traditionally viewed as a benign virus causing mild symptoms in healthy individuals, human cytomegalovirus (HCMV) has been recently implicated in the pathogenesis of various cancers, spanning a wide range of tissue types and malignancies. This perspective article defines the biological criteria that characterize the oncogenic role of HCMV and based on new findings underlines a critical role for HCMV in cellular transformation and modeling the tumor microenvironment as already reported for the other human oncoviruses.