Vinorelbine plus intermediate dose cyclophosphamide is an effective and safe regimen for the mobilization of peripheral blood stem cells in patients with multiple myeloma

Abstract

High dose cyclophosphamide (HD-Cy) is commonly used to mobilize stem cells in multiple myeloma (MM). However, timing of collection is variable and incidence of side effects is substantial. We evaluated a combination of vinorelbine (VNB) (25 mg/m2 day 1) plus Cy (1.5 g/m2 day 2) and G-CSF as mobilizing regimen in 37 patients with MM. Results were compared to those achieved in 41 previously diagnosed patients mobilized with Cy at 4 g/m2. Overall, 36/37 patients receiving VNB-Cy (97%) mobilized, as opposed to 40/41 (97%) in the controls (p:0.51). Median CD34+ cells peak was 94/μl for VNB-Cy patients and 96 for controls, p=0.36; median number of CD34+ cells collected was 9.2 × 106/kg and 8.7 × 106/kg, respectively (p =0.85). Median number of days to the highest CD34 count was shorter for VNB-Cy patients (nine vs 11, p =0.001). No VNB-Cy patient experienced grade 3-4 neutropenia and thrombocytopenia, as opposed to 63 and 19% in the controls (p =0.001 and 0.01, respectively). Hospitalization from toxicity was never required in VNB-Cy patients as compared to 19% in control group (p =0.01). We conclude that an outpatient combination of VNB plus intermediate dose Cy plus G-CSF is a safe, predictable, and highly effective mobilization regimen for patients with newly-diagnosed MM. © Springer-Verlag 2006.