- Human immunodeficiency virus (HIV)-positivity with cluster of differentiation (CD)4 count < 200 cells/microliter; note that HIV-positive patients are eligible, provided they are under treatment with highly active antiretroviral therapy (HAART) and have a CD4 count >= 200 cells/microliter no more than 30 days prior to registration; note also that HIV testing is not required for eligibility on this protocol