Impact of age and gender on the pharmacokinetics of gemtuzumab ozogamicin.

Study Objective. To determine the pharmacokinetic parameters of the components of gemtuzumab ozogamicin and to assess the possible influence of age and gender on the values. Design. Phase II, multicenter, open-label, nonrandomized, parallel study. Setting. Hospitals and outpatient oncology clinics. Patients. Fifty-eight patients with acute myeloid leukemia in first relapse participated. Demographic data included 29 men and 29 women; 34 were younger than 60 years of age (mean age 53 ± 16 yrs). Intervention. Patients received gemtuzumab ozogamicin as a single 2-hour infusion of 9 mg/m 2 . Serial plasma samples were collected over 10 days after the beginning of the infusion. Measurements and Main Results. Plasma concentrations of components of gemtuzumab ozogamicin (hP67.6 antibody, total and unconjugated calicheamicin derivatives) were measured by validated enzyme-linked immunosorbent assays. Pharmacokinetic parameters were determined by noncompartmental methods and comparisons between groups were made by analysis of variance. No significant differences were seen between men and women or between those over 60 and those less than 60 years of age in maximum concentration, time to maximum concentration, area under the curve, clearance, or volume of distribution for components of gemtuzumab ozogamicin. Conclusion. No differences occur in the pharmacokinetics of the components of gemtuzumab ozogamicin (hP67.6 or calicheamicin) based on gender or age.