Bendamustine HCL in Relapsed and Primary Refractory Hodgkin Lymphoma

Patients will receive bendamustine 120mg/m\^2, administered as a 30-minute infusion, for two consecutive days. Cycles will be repeated every four weeks and a total of 6 cycles will be planned. Patients will receive pegfilgrastim with each cycle. Treatment will be delayed until the absolute neutrophil count is \> 1000/ul and the platelet count is \> 75,000/ul.