Abstract
With the aim to assess the efficacy of subcutaneous cladribine in combination with rituximab, 29 newly diagnosed/pretreated WM patients were enrolled in a multicenter phase II trial. Intended therapy consisted of rituximab on day 1 followed by s.c. cladribine 0.1 mg/kg for 5 consecutive days, administered monthly for 4 cycles. The expression of genes involved in cladribine metabolism was evaluated. With a median follow-up of 50 months the ORR rate observed was 89.6% without any difference between newly or pretreated patients (P=.522). The therapy was well tolerated; no major infections were observed, no patients developed transformation to high-grade NHL nor myelodysplasia. Low expression levels of hCNT1 correlated with the failure to achieve a CR (P=.024). The combination of rituximab/cladribine is safe and effective in WM patients requiring treatment. The pharmacogenomic analysis suggests that hCNT1 might be beneficial in predicting clinical response to such a combination treatment.
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