Methods such as surgery, chemotherapy or radiotherapy are used to treat most cancers. However, sometimes cancer cannot be successfully treated with conventional treatments. In this situation, stem cell transplantation may be a suitable option. This type of stem cell transplant is mainly used in the treatment of various types of blood cancer. From the medical point of view, the exact name of this is Hematopoietic Stem Cell Transplant (HSZT).This book is dedicated to the merciful angels who:The lord of the worlds, who began to guide his servants with the teaching of the pen. My parents, whose presence is a crown of honor for me and their name is a reason for my existence because these two existences after the lord, have been the source of my existence, took my hand and taught me to walk in this valley full of ups and downs.