AML with t(8; 21)(q22; q22) or inv(16)(p13; q22)/t(16; 16)(p13; q22) is known as CBF-AML. KIT mutations are common in CBF-AML, which have a worse prognosis.This study is aimed to evaluate the efficacy of Avapritinib, an highly specific inhibitor of the KIT gene, in CBF-AML with KIT mutations.

Acute Myeloid Leukemia (AML) with the chromosomal abnormality of t(8; 21)(q22; q22) or inv(16)(p13; q22)/t(16; 16)(p13; q22) is known as the Core Binding Factor AML (CBF-AML). KIT mutation is a common mutation in CBF-AML, which is more likely to relapse and have a worse prognosis.

Avapritinib is an oral tyrosine kinase inhibitor (TKI) with selective inhibitory activity against KIT and PDGFRA. Avapritinib has been approved by FDA for the treatment of gastrointestinal stromal tumors(GIST) with PDGFRA mutations and Advanced systemic mastocytosis (AdvSM). However, the efficacy of avapritinib in AML with KIT mutations is uncertain.

This prospective, multicenter clinical study of the efficacy and safety of avapritinib in relapsed refractory or molecular minimal residual disease (MRD)-positive AML with KIT mutations.

Inclusion Criteria:

1. Patients with acute myeloid leukemia accompanied by t(8; 21)/RUNX1-RUNX1T1, or inv(16)/t(16; 16)/CBFβ-MYH11;
2. Accompanied by KIT mutation
3. Disease recurrence after the first remission, or the mol-MRD remains positive after the morphologic remission of AML.
4. No active infection.
5. Liver function: TBIL≤ 2×ULN,ALT/AST≤ 3×ULN, CCr ≥ 50ml/min，NYHA grading ≤2; SaO2 >92%.
6. ECOG <2;

(11) Predicted survival > 12 weeks.

Exclusion Criteria:

1. Accept other AML targeted therapies, such as dasatinib, sorafenib, gilteritinib, etc. simultaneously;
2. The presence of uncontrolled and active infections (including bacterial, fungal or viral infections).
3. Underlying diseases such as myocardial infarction, chronic heart failure, decompensated liver dysfunction, renal failure, etc.
4. Pregnant or lactating women;
5. Accompanied by other malignant tumors requiring treatment;
6. Other interventional clinical studies have been enrolled.