The purpose of this single-arm, open-label, dose escalation + cohort expansion study is to evaluate the safety, tolerability, pharmacokinetic and preliminary efficacy of TGRX-678 in Chronic Myelogenous Leukemia patients who had failure with or are intolerant to TKI treatments.

This is the first trial with TGRX-678 conducted to US patients which aims to evaluate the safety profile and preliminary efficacy profile in advanced or refractory CML patients with previous failure or intolerance to TKI treatments. The primary purpose of this study is to evaluate the safety profile of TGRX-678, including determination of the recommended dose for expansion (RDE) and other safety measures of the investigational drug, such as adverse events and abnormal clinical outcomes. Preliminary efficacy profile of TGRX-678 is evaluated based on the changes in peripheral blood cells and disease-associated cytogenetic and molecular markers. Recommended Phase II dose (RP2D) will be determined at end of the study considering safety, tolerability, pharmacokinetic and efficacy data.

Inclusion Criteria:

• Willing to participate in the study with informed consent;
• At least 18 years of age at the time of screening;
• Any sex;
• Diagnosis of CML-CPduring the screening period;
• Intolerant or resistant to TKI treatments;
• Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2;
• Adequate Absolute neutrophil count (ANC), hemoglobin and platelets levels;
• Adequate renal and liver function;
• Normal corrected QT (QTcF) interval as indicated by electrocardiogram (ECG) screening results;
• Negative blood pregnancy test results for female patients of childbearing potential.
• Willing to take highly effective contraceptive measures throughout the trial and for 6 months after last dose of investigational drug for female subjects of child-bearing potential or male subject with female partner of child-bearing potential.

Exclusion Criteria:

• Exposure to other antineoplastic therapies prior to study enrollment;
• Exposure to other investigational agent(s) within 14 days of initiating TGRX-678 therapy;
• Ongoing toxicity from prior therapy greater than grade 1 by CTCAE v. 3 (except alopecia);
• Hematopoietic cell transplantation < 60 days prior to the first dose;
• Evidence of graft versus host disease (GVHD), whether or not requiring immunosuppressive therapy;
• Concomitant immunosuppressive therapy (other than short-term corticosteroid treatment);
• Exposure to drugs related to torsade de pointes;
• Cytological or pathological diagnosis of active central nervous system disorder;
• Significant or uncontrolled cardiovascular diseases as defined in the full clinical protocol;
• Having long QT syndrome, or with family history of idiopathic sudden death or congenital long QT syndrome;
• Uncontrolled hypertension;
• Receipt of Traditional Chinese medication or herbal preparations indicated for anti-cancer purposes within 2 weeks prior to the first dose;
• Severe hemorrhagic disorders unrelated to CML;
• History of pancreatitis;
• History of excessive alcohol use;
• History of elevation in amylase or lipase within 1 year;
• Have Grade 2 or worse interstitial lung disease or interstitial pneumonitis within 4 weeks prior to Screening;
• Uncontrolled hypertriglyceridemia;
• Malabsorption syndrome or other illness that could affect oral absorption.
• Diagnosis of another primary malignancy in the past 3 years;
• Reception of major surgery within 14 days prior to the first dose;
• Active infections that require systemic treatment or other severe infections within 14 days prior to enrollment;
• Known human immunodeficiency virus (HIV) positive; acute or chronic liver disease (including chronic hepatitis B virus (HBV) and hepatitis C virus (HCV) infections);
• Have received or will receive a COVID-19 vaccine within 14 days of study enrollment;
• Have a positive reverse transcriptase polymerase chain reaction (RT-PCR) test result for SARS-CoV-2 within 2 weeks prior to Screening;
• Pregnant or breastfeeding female;
• Female patient of child-bearing potential or male patient who have female partners of child-bearing potential that is unable or unwilling to take highly effective contraceptive measures during the trial and for 6 months after last dose of investigational drug;
• Significant organ dysfunction that could compromise the patient's safety or the evaluation of the drug's safety in the opinion of the investigator or the medical monitor;
• Any condition makes participation in this trial inappropriate in the opinion of the investigator or medical monitor;