Patients will start treatment on day 1 of cycle 1 with dasatinib. For patients undergoing dasatinib pharmacokinetic (PK) analysis, dasatinib will be administered alone until initial PK assessments are collected. Protracted TMZ will be initiated after initial dasatinib PK assessments are collected and will continue to be administered with dasatinib on a continuous daily dosing schedule. The initial dasatinib PK assessments will be collected over 24 hours between days 3-7 of cycle 1. Patients not undergoing dasatinib PK collections will begin both dasatinib and protracted, daily TMZ together on day 1, cycle 1.