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These diseases occur more frequently, though not exclusively, among people living with HIV or other types of immune dysregulation. While limited KS can regress with immune reconstitution, such as through antiretroviral therapy (ART) in people living with HIV, there are currently no curative treatments for advanced KS. Preventive or therapeutic vaccines targeting KSHV could have a significant clinical impact; however, the development and testing of such strategies have been limited by the lack of preclinical models that faithfully recapitulate KS, including the presence of infected spindle cells and a relevant immune microenvironment. HIV\/AIDS is an important cofactor for KS, and globally, the majority of individuals with KS are HIV\u2010infected. Current evidence indicates that HIV\u20101 may enable KS progression through immunosuppression and promote pathogenesis by inducing inflammatory cytokines and producing secreted regulatory proteins like Tat and Nef. The design and testing of new therapeutic approaches based on pathogenesis are hampered by the lack of models that replicate KSHV oncogenesis in the context of HIV\/AIDS. In the present study, we demonstrate that KSHV\u2010infected cells can form tumors in an immunocompetent mouse model after in vivo passage in nude mice and EcoHIV infection and\/or morphine treatment, both of which have immunomodulatory and pro\u2010inflammatory effects. These tumors exhibit gene expression profiles and immune microenvironments that closely resemble those observed in human KS lesions. This novel KSHV tumor model in immunocompetent mice provides a valuable platform to test immunotherapeutic strategies for KS, including immunomodulatory agents, targeted antibody therapies, checkpoint inhibitors, and vaccines.<\/jats:p>","DOI":"10.1002\/jmv.71035","type":"journal-article","created":{"date-parts":[[2026,6,29]],"date-time":"2026-06-29T13:02:38Z","timestamp":1782738158000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["HIV Infection and Opioid Treatment Enable the Engraftment of Kaposi Sarcoma\u2010Like Tumors Into Immunocompetent Mice"],"prefix":"10.1002","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6842-6815","authenticated-orcid":false,"given":"Julian","family":"Naipauer","sequence":"first","affiliation":[{"name":"CONICET\u2010Universidad de Buenos Aires, Instituto de Fisiolog\u00eda, Biolog\u00eda Molecular y Neurociencias (IFIBYNE) Buenos Aires Argentina"},{"name":"Department 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