Abstract
Fludarabine produces high response rates in patients with B-cell chronic lymphocytic leukemia (CLL). Nevertheless, response to fludarabine of patients with previously treated CLL varies from 17% to 74% (0% to 38% CR). In 68 patients with heavily pretreated and advanced CLL, an overall response rate to fludarabine of 28% (4% CR) was observed. Response correlated with sensitivity of the disease to previous treatments (relapsing vs. refractory disease) (62% vs. 20%; p = 0.005) and, albeit not significantly, with the number of cycles of fludarabine (>3 vs. < or = 3) that patients could receive (36% vs. 15%; p = NS). Responding patients had a longer survival (median, not reached) than those not responding (median, 11 months) (p = 0.03). Severe toxicity was observed in some cases. It is concluded that fludarabine is a highly useful agent in CLL. However, in order to improve its effectiveness and decrease its toxicity, fludarabine should be given as soon as a lack of response to front-line therapy is observed and before the disease becomes completely resistant to therapy.
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