Idarubicin and high dose cytarabine: a new salvage treatment for refractory or relapsing non-Hodgkin's lymphoma.

Twenty three patients with relapsing (n = 11) or refractory (n = 12) non-Hodgkin's lymphoma (NHL) to one or two prior anthracycline based combination chemotherapy regimens were treated as second or third line regimen with 3 induction cycles of Idarubicin (IDA) (7 mg/m2/d i.v. d1-d3) and high dose cytarabine (HD Ara-C) (1 g/m2/12 h i.v. d1-d3), each cycle was repeated every 3 weeks. Responding patients received a maintenance therapy with monthly cycles of IDA: 15 mg/m2 d1-d3, Etoposide 100 mg/m2 d1-d3, both by oral route. Twenty two patients are evaluable and we observed 13 CR and 1 PR with an overall response rate of 61% (14/23: 95% Cl = 38.5% 80.3%). The median time to progression was 32 months (6.5 - 63 + m.). The response rate to IDA-HD Ara C was not different for patients with (n = 14) or without (n = 9) objective response to the last prior therapy. The main toxicity was hematological: all patients experienced grade 4 neutropenia and 22 patients had grade 4 thrombopenia, but there were no toxic deaths. IDA and HD-Ara-C combination is highly effective in refractory or relapsed. NHL. As hematological toxicity was the limiting factor for further escalation of dose-intensity, further studies might include hematopoietic growth factors support in the therapeutic scheme.