- Patients will be enrolled at collection of at least 3.0 x 10^6 CD34 cells/kg of autologous hematopoietic progenitor cells (HPC-A) by apheresis; a minimum of 2 collection procedures is required, unless collection on day # 1 > 5.0 x 10^6, CD34 cells/kg; a maximum of 10 collections is allowed; bone marrow harvest to supplement apheresis is not allowed