Pilot study of hydroxyurea in human immunodeficiency virus-infected children receiving didanosine and/or stavudine

Objective. To evaluate the safety and antiviral and immunologic effects of hydroxyurea given with didanosine (ddI) and/or stavudine (d4T) to symptomatic HIV-infected children. Methods, HIV-infected children with a history of long term nucleoside antiretroviral therapy were treated orally with hydroxyurea (initial dose, 10 to 20 mg/kg once daily; final dose, 30) mg/kg once daily), added to existing therapy that included ddI and/or d4T. Results. Sixteen children were enrolled (mean age, 6.7 years; range, 1.8 to 13.4 years). Antiretroviral therapy used with hydroxyurea included d4T/ddI (12), ddI (2), d4T (1) and d4T/lamivudine (1). Children received between 24 and 48 weeks of therapy, which was well-tolerated. Hydroxyurea was held temporarily during the first month of therapy in 4 cases because of neutropenia; all patients resumed hydroxyurea at full dosage without recurrence of neutropenia, No patient discontinued therapy permanently because of intolerance or toxicity. For the 13 children who completed 48 weeks of study treatment, the mean plasma HIV RNA concentration decreased from 4.6 log(10) copies/ml at baseline to 4.2 log (10) copies/ml at study Week 48 (P = 0.035, paired t test). Fight of these 13 children experienced a 0.5-log(10) copies/ml or greater drop in HIV RNA concentration in the 48 weeks of study treatment. Apprec:iable changes in CD4(+) lymphocyte percentage were not noted. Conclusions. Hydroxyurea, added to existing therapy with ddI and/or d4T, was well-tolerated and safe in HIV-infected children. Evidence of antiviral activity was observed in some cases.