Immature stem cells in the bone marrow (soft fatty tissue inside your bones) give rise to blood cells. These blood cells mature and enter the bloodstream. In bone marrow transplant damaged and destroyed bone marrow is replaced with healthy bone marrow stem cells removed from you or from a donor. It is used to Restore stem cells that have been destroyed by high doses of chemotherapy and/or radiation therapy Treat certain blood cancers like multiple myeloma leukemia lymphoma etc. Treat blood disorders like sickle cell anemia thalassemia aplastic anemia etc. There are three different types of bone marrow transplants: Autologous