Clinical Research Directory

Inclusion Criteria: * Male or female, age ≥ 18 and ≤ 65 years * HIV-1 infection * On continuous antiretroviral therapy for at least 12 months without any interruptions of greater than 14 consecutive days, and on a stable regimen that does not include a non-nucleoside reverse transcriptase inhibitor (NNRTI) for at least 4 weeks or any long-acting ART drug that may be active in the participant after ART interruption for up to one year, without plans to modify ART during the study period * Screening plasma HIV RNA levels below the limit of quantification on all available determinations in past 12 months (isolated single values ≥ 40 but \< 200 copies/mL will be allowed if they were preceded and followed by undetectable viral load determinations) * CD4+ T cell count nadir \> 300 cells/mm3 * Screening CD4+ T-cell count ≥ 500 cells/mm3 * Available ART treatment history and the capacity to construct an effective antiretroviral treatment regimen * Willing to pause ART as part of the study Exclusion Criteria: * Pregnant, breastfeeding, or unwilling to practice birth control during participation in the study * ART regimen that includes a long-acting anti-HIV drug and/or NNRTI that may be active in the participant for up to one year after ART interruption * ART regimen that includes protease inhibitor(s) and/or AZT. These drugs may increase the toxicity of cyclophosphamide. * Any history of an HIV-associated malignancy, including Kaposi's sarcoma and any type of lymphoma, or virus-associated cancers * History of or current active hepatitis B (HBV) infection defined as positive HBV surface antigen test. A positive anti-HBc regardless of HBsAg status. * Active hepatitis C (HCV) infection * Active or latent tuberculosis infection * Chronic liver disease * Active and poorly controlled atherosclerotic cardiovascular disease * Unwillingness to abstain from sex or use barrier protection for any sexual activity during the treatment interruption.