Intravenous Chemotherapy or Oral Chemotherapy in Treating Patients With Previously Untreated Stage III-IV HIV-Associated Non-Hodgkin Lymphoma

Inclusion Criteria: * Ability to understand and the willingness to provide written informed consent to participate * Adults, 18 years of age or older; date of birth should be determined based on the best possible information or source documentation available * HIV-1 infection, documented by any licensed rapid HIV test or HIV enzyme or chemiluminescence immunoassay (E/CIA) test kit at any time prior to study entry and confirmed by a licensed Western blot or a second antibody test by a method other than the initial rapid HIV and/or E/CIA, or confirmed by HIV-1 antigen or plasma HIV-1 ribonucleic acid (RNA) viral load \> 1,000 copies/mL * NOTE: the term "licensed" refers to a United States (U.S.) Food and Drug Administration (FDA)-approved kit or for sites located in countries other than the United States, a kit that has been certified or licensed by an oversight body within that country and validated internally * WHO (World Health Organization) and CDC (Centers for Disease Control and Prevention) guidelines mandate that confirmation of the initial test result must use a test that is different from the one used for the initial assessment; a reactive initial rapid test should be confirmed by either another type of rapid assay or an E/CIA that is based on a different antigen preparation and/or different test principle (e.g., indirect versus competitive), or a Western blot or a plasma HIV-1 RNA viral load * Biopsy-proven, measurable or assessable systemic NHL that has been co…