Minimum tolerable interval of 90yttrium ibritumomab-tiuxetan to autologous stem cell transplantation after high-dose chemotherapy with carmustin, etoposide, cytarabine, and melphalan for relapsed or refractory aggressive B-cell non-Hodgkin lymphoma.

6543 Background: High-dose therapy and autologous stem cell transplantation (ASCT) in patients (pts) with aggressive B-NHL failing from immunochemotherapy including rituximab show poor outcome with 3y PFS of 39% (Gisselbrecht et al. JCO 2010). Combining BEAM with 90yttrium ibritumomab tiuxetan is a promising option to enhance the efficacy of the high-dose regimen. Methods: Pts without disease progression during salvage therapy of relapsed or refractory CD20+ aggressive B-NHL were included in this prospective, multicenter, phase I/II trial. Primary endpoint was the maximum tolerated dose of 90Yttrium ibritumomab tiuxetan given as close as possible to ASCT defined as <2 pts with dose limi…