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Kaposi sarcoma-associated herpesvirus [KSHV, also known as human herpesvirus 8 (HHV-8)] is the most recently identified member of the human herpesvirus family. Kaposi sarcoma (KS), primary effusion lymphoma, and multicentric Castleman disease are all associated with KSHV infection. Although the incidence of KS has declined dramatically in areas with access to highly active antiretroviral therapy, it remains the most common AIDS-associated malignancy in the developed world and is one of the most common cancers in developing nations. Current treatment options for KSHV-associated disease are ineffective, unavailable, or toxic to many affected persons. A growing body of basic science, preclinical, and observational data suggests that antiviral medications may play an important role in the prevention and treatment of KSHV-associated disease.

Since the advent of the HIV-1 pandemic, a close association between HIV-1 infection and the development of selected types of cancers has been brought to light. The discovery of Kaposi sarcoma-associated herpesvirus (KSHV) has led to significant advances in uncovering the virological and molecular mechanisms involved in the pathogenesis of AIDS-related malignancies. Extensive evidence indicates that HIV-1 trans -activating protein Tat plays an oncogenic role in the development of KSHV-associated neoplasms. Comprehensive knowledge of the functions of Tat-1 together with the KSHV genes will contribute to a better understanding of the pathogenesis of virus-associated cancers and the interaction of viruses with their hosts.