Evaluate Efficacy and Safety/Tolerability Profiles of Antroquinonol in Acute Myeloid Leukemia (AML) Adult Patients

Inclusion Criteria: 1. Diagnosis of relapsed AML after at least 1 chemotherapy regimen or at initial diagnosis when no intensive treatment possible (based on standard criteria). 2. Men and women 18 to 70 years of age. 3. ECOG performance status = 0 or 1. 4. Ability to comply with the study requirements and give written informed consent. 5. Expected survival more than 3 months. 6. Patients with preserved reproductive potential agree to use, with their partner, adequate contraception throughout the study and for 30 days thereafter (contraceptive methods with reliability greater than 90%: cervical caps with spermicide, diaphragms with spermicide, condoms with intravaginal spermicide, non-hormonal intrauterine devices), or true sexual abstinence. Exclusion Criteria: 1. Acute promyelocytic leukemia (APL). 2. Hemoglobin ≤ 7g/dL or platelet ≤ 50,000. 3. Abnormal liver and renal function: * Total bilirubin \> 2 mg/dL; * AST and ALT \> 2.5 × ULN; * Creatinine \> 1.5 × ULN, OR creatinine clearance \< 50 mL/min/1.73m2. 4. The subject has not recovered to grade ≤ 1 adverse events due to investigational or chemotherapeutic drugs or stem cell transplantation which were administered \> 4 weeks prior to study enrollment. 5. Patient who has had in the past 3 years any previous or concomitant malignancy EXCEPT adequately treated basal or squamous cell carcinoma of the skin, in situ carcinoma of the cervix or bladder, in situ ductal carcinoma of the breast. 6. Subjects with any serious active infection (i.e., requiring an intravenous antibiotic, antifungal, or antiviral agent). 7. Subjects with known human immunodeficiency virus, active hepatitis B or C. 8. Subjects who have any other life-threatening illness or organ system dysfunction, which in the opinion of the Investigator, would either compromise subject safety or interfere with the evaluation of the safety of the study drug. 9. Known or suspected substance abuse or alcohol abuse. 10. Patients with history of seizure disorders or central nervous system leukemia. 11. Patients with uncontrolled, intercurrent illness including, but not limited to, symptomatic neurological illness; active, uncontrolled, systemic infection considered opportunistic, life-threatening, or clinically significant at the time of treatment; symptomatic congestive heart failure; unstable angina pectoris; cardiac arrhythmia; significant pulmonary disease or hypoxia; or psychiatric illness/social situations that would limit compliance with study requirements. 12. Inability to swallow oral medications or a recent acute gastrointestinal disorder with diarrhea e.g., Crohn's disease, malabsorption, or CTCAE Grade \> 2 diarrhea of any etiology at baseline. 13. Prior major surgery or trauma within 28 days prior to first dose of study drug. 14. A positive urine pregnancy test (strip) for female patients of childbearing potential.