[Use of subgrafting doses of peripheral stem cells is a new approach to overcoming hematological toxicity of multiple intensive courses of chemotherapy in children].

The authors examined 8 patients with pretreated relapsing or resistant solid tumors (Wilms'--4, rhabdomyosarcoma--3, synovial sarcoma--1) who received 16 courses of chemotherapy: iphosphamide, 1800 mg/m2/day (days 1-5), vepeside, 100 mg/m2/day (days 1-5), and carboplatin 500 mg/m2/day (day 1) (IVC) and 18 courses of therapy wherein iphosphamide was replaced by cyclophosphanum, 400 mg/m2/day (days 1-5) (CVC). The patients received 2-4 induction courses (n = 18) and 1-5 consolidation courses (n = 16) with reinfusion of peripheral stem cells (PSC). All PSC separations were performed after the first or second courses of IVC/CVE. There were no significant increases in the duration of leukopenia and thrombocytopenia, in the incidence of infection with a higher ordinal of a course performed by PSC maintenance. The findings suggest that the small doses of PSC stimulated by colony-stimulating factor can maintain hemopoiesis and decrease the rate of the estimated bone marrow depletion long after repeated courses of chemotherapy in patients with prognostically poor solid tumors.