CD34 and non-Hodgkin lymphoma: Studies of PBSCH have reported several factors associated with poor mobilization [12,13,14,15,16,17,18,19]: older age, low hemoglobin level, low platelet count, low WBC count, mobilization regimen, diagnosis of NHL, bone marrow involvement, previous PBSCH failure, previous use of myelotoxic agents, number of chemotherapy cycles, time from diagnosis to harvest, bone marrow cellularity, and peripheral CD34+ cell count.