Autologous bone marrow transplant means that the stem cells that are extracted, are from the patient's body before it is exposed to high dose chemotherapy or radiation therapy process. The purpose of high-dose chemotherapy is to completely remove cancer cells. The extracted stem cells are preserved in the freezer or by using a specific chemical assistant at very low temperatures. After this procedure stem cells are infused in the patient again to regain the proper functioning of blood cells through stem cells. It usually takes about 2-3 weeks for the injected stem cells to form blood cells again in the body.