FLT3 Internal Tandem Duplication Positive

This clinical trial aims to evaluate whether molecular MRD-guided chemotherapy can effectively treat FLT3-ITD mutated AML and potentially replace allogeneic hematopoietic stem cell transplantation. It primarily seeks to answer: * What is the complete remission rate after initial induction with Gilteritinib, Venetoclax, and Azacitidine? * What are the survival rates and safety of subsequent high-dose cytarabine consolidation after two cycles of this induction therapy? As a single-arm study, outcomes will be compared against historical data from standard treatments (including transplant) to assess if the new strategy is equally or more effective. Participants will: * Undergo three cycles of high-dose cytarabine consolidation after two cycles of induction therapy, contingent upon achieving deep FLT3-ITD molecular remission. * Start Gilteritinib maintenance therapy after consolidation if FLT3-ITD remains detectable, continuing until deep molecular remission is achieved again.