Bulk Versus Fractionated Stem Cell Infusions in Patients With Hematologic Malignancies Undergoing Stem Cell Transplantation

The purpose of this study is to find out if getting a blood stem cell transplant with donor stem cells given over several days is better than getting a blood stem cell transplant with donor stem cells given over 1 day. We want to find out which procedure over will result in improved recovery of blood and immune function after transplant. When donor stem cells are given over various days in mice, the blood and immune system recovery is quicker.