A Study of HYML-122 in Patients With FLT3 Positive Relapsed or Refractory Acute Myeloid Leukemia (AML)

Inclusion Criteria:

• Fully understand the procedures of the clinical study and participate voluntarilywith signed and dated written informed consent form, comply with the requirements ofthe study protocol.

• Males and/or females at least 18 years old when signing the informed consent form.

• Histologically confirmed AML (defined using WHO criteria 2016) with one of thefollowing:

Refractory to at least 1 cycle of induction chemotherapy. Relapsed after achieving remission with a prior therapy.

• Subject is positive for FLT3 mutation in bone marrow or blood after completion ofthe subject's last interventional treatment.

• Eastern cooperative oncology group performance status (ECOG) ≤2 at screening.

• Life expectancy of at least 3 months.

• Women of childbearing potential have a negative pregnancy test at baseline and arewilling to employ an effective method of contraception for the entire duration ofstudy treatment and 6 months after the last dose.

Exclusion Criteria:

• Known or suspected allergies to any of the investigational drug composition (HYML-122, lactose, hydroxypropyl cellulose, hyposubstituted hydroxypropylcellulose, silicon dioxide, magnesium stearate, titanium dioxide and polyethyleneglycol).

• Medical history and surgical history excluded according to the protocol.

• Any previous medical treatment history exclude from the protocol.

• Abnormal laboratory results exclude from the protocol.

• Combination of treatments and/or drugs required during the study period and cannotbe discontinued that excluded from the protocol.

• Alcohol abuse within 6 months prior to screening, defined as long-term drinkinghistory, generally more than 5 years, equivalent to alcohol quantity ≥40g/d for men, ≥20g/d for women, or heavy drinking history within 2 weeks, equivalent to alcoholquantity ≥80g/d. alcohol volume (g) conversion formula=alcohol consumption (mL)*alcohol content (%)*0.8.

• Abortion less than 30 days prior to screening, pregnant and lactating women (currently breast-feeding or less than one year after delivery although notbreast-feeding), women of childbearing potential who are not guaranteed effectivecontraception during the study, planning pregnancy or donating eggs or sperm within 6 months after the last dose.

• History of drug abuse or drug addicts.

• Subjects may not be able to complete the study duo to poor compliance or otherreasons, or unsuitable for the study by the investigator's judgment.