Bendamustine Hydrochloride, Etoposide, Dexamethasone, and Filgrastim For Peripheral Blood Stem Cell Mobilization in Treating Patients With Refractory or Recurrent Lymphoma or Multiple Myeloma

PRIMARY OBJECTIVES: I. To estimate the frequency of bendamustine (bendamustine hydrochloride) combined with GCSF (filgrastim) and dexamethasone to successfully mobilize peripheral blood stem cells (PBSCs) (as determined by collecting a minimum of 2 x 10\^6 cluster of differentiation (CD)34+/kg). SECONDARY OBJECTIVES: I. To evaluate the response rate to bendamustine by diagnosis using established disease-specific response criteria. II. To examine the number of apheresis cycles required to collect a minimum of 2 x 10\^6 CD34+ cells/kg and ideally \>= 5 x 10\^6 CD34+ cells/kg (when achievable). III. To assess the impact of bendamustine on B and T-lymphocyte populations in the peripheral blood (CD20+ cells, natural killer \[NK\] cells, CD4+25+ foxP3- regulatory cells, and CD8 cells). OUTLINE: Patients receive bendamustine hydrochloride intravenously (IV) over 30-60 minutes on days 1 and 2, etoposide IV over 60-240 minutes on days 1-3, dexamethasone orally (PO) on days 1-4, and filgrastim subcutaneously (SC) beginning on day 5 and continuing until peripheral blood stem cell collection is complete. Patients undergo leukapheresis daily for a minimum of 3 days or until \> 5 x 10\^6 CD34+/kg has been collected. After completion of study treatment, patients are followed for up to 5 years.