The observational study aimed at evaluating the incidence of systemic mastocytosis associated with t(8;21) AML in patients with de novo t(8;21) AML and their responses to first induction, and the prognosis from standard therapy.

This is a multicenter, retrospective and prospective, observational study that aims to collect clinical information on patients with systemic mastocytosis associated with t(8;21) AML from September 2022 to August 2023. No intervention is expected.

The purpose of this study is to identify and characterize the patients with systemic mastocytosis associated with t(8;21) AML, t(8;21) AML without systemic mastocytosis, and OSM (Oligo-mastocytic SM) with associated t(8;21) AML.

In order to estimate the incidence of systemic mastocytosis associated with t(8;21) AML, a survey will be sent every month to all participating sites to collect the number of all diagnoses of systemic mastocytosis associated with t(8;21) AML, t(8;21) AML without systemic mastocytosis, and OSM with associated t(8;21) AML. All patients will be followed until August 2025 in order to have at least 2 years of observation.

Inclusion Criteria:

1. Male or female, Age (years) >= 5;
2. Newly diagnosed as t(8;21) AML patients according to World Health Organization (WHO) classification;
3. Patients who sign the informed consent must have the ability to understand and be willing to participate in the study and sign the informed consent.

Exclusion Criteria:

1. The t(8;21) AML patients with SM have been diagnosed already;
2. Patients with drug abuse or long-term alcoholism that affected the evaluation of trial results;
3. Patients were deemed unsuitable for enrolment by the investigator.

Candidates will come from patients with newly diagnosed t(8;21) acute myeloid leukemia (AML) in the First Affiliated Hospital of Soochow University and the participated centers from September 2022.

Participants should meet the inclusion criteria and not meet exclusion criteria.