Maintenance therapy, which will last for up to 2 years, will be given after you complete all 8 courses of intensive chemotherapy. You will receive vincristine on Day 1 by vein about every 28 days. You will receive prednisone on Days 1-5 by mouth about every 28 days. You will receive dasatinib every day by mouth 2 times a day. During Months 6 and 13, you may receive another course of hyper-CVAD, depending on how you are feeling and if you have presence of disease. You will also receive rituximab during these months if your doctor thinks it is needed.