Clinical trials have shown that the multi-kinase inhibitor midostaurin improves survival in patients with AML. The main objective of this study is to investigate its effect (in conjunction with cytarabine) on progression free survival, as well as overall survival and morphologic response rate in patients with relapsed or refractory AML. This study will also attempt to identify specific populations of patients with relapsed or refractory AML who best respond to treatment with midostaurin to enhance treatment planning.