<qa>  What is the name of the drug that helps prevent bladder damage caused by the cyclophoPatients will receive the anti-CD45 with high dose chemotherapy including Ara-C and Cyclophosphamide and radiotherapy. Patients will also receive Mesna which is a drug that helps prevent bladder damage which can be caused by the cyclophosphamide. High dose radiotherapy is also known as Total Body Irradiation or TBI. 