HIV infection is associated with a high incidence of AIDS-related lymphomas (ARL). Since the use of highly active antiretroviral therapy (HAART), the incidence of AIDS-defining illnesses has decreased, leading to a significant improvement in survival of HIV-infected patients. The incidence of ARL has decreased in a lower degree and lymphoma remains the major cause of death of HIV patients. Most treatment procedures disclose a relatively poor outcome of patients with low response rates, high number of relapses and AIDS events. Since the majority of HIV-associated NHL are CD20-positive the addition of rituximab to the standard regimen - CHOP could improve the outcome of these patients