Subcutaneous Ig in Allogeneic Stem Cell Transplant Recipients

The purpose of the study is to determine whether home subcutaneous immunoglobulin (ScIG) is tolerated as replacement therapy for hypogammaglobulinemia in patients that have undergone allogeneic hematopoietic cell transplantation (alloHCT). Secondary objective is to perform a financial analysis comparing the cost of ScIG with intravenous immunoglobulin (IVIG). The study hypothesis is that home based SCIG treatment is applicable and tolerated well for replacement treatment in alloHCT patients. This will be examined in two sets of patients recruited: A) Patients already on IVIG replacement therapy and B) Newly diagnosed patients with hypogammaglobulinemia. Economic analysis will be performed by comparing the cost with an equal number of patients retrospectively determined to have undergone treatment with IVIG.