A First-in-Human Study of JAB-8263 in Adult Patients With Advanced Solid Tumors

Inclusion Criteria: Subjects must meet all the following criteria in order to be included in the research study: 1. Subject must be ≥18 years-of-age at the time of signature of the informed consent form (ICF). 2. Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0 or 1. 3. Subjects with histologically or cytologically confirmed advanced solid tumors which have progressed despite standard therapy(ies), or are intolerant to standard therapy(ies), or have a tumor for which no standard therapy(ies) exists. 4. Subjects with life expectancy ≥3 months. 5. Patients must have at least one measurable lesion as defined by RECIST v1.1. 6. Patients who have sufficient baseline organ function. Exclusion Criteria: 1. History (≤3 years) of cancer that is histologically distinct from the cancer under study. 2. Known serious allergy to investigational drug or excipients 3. Active brain or spinal metastases 4. History of pericarditis or Grade ≥2 pericardial effusion 5. History of interstitial lung disease. 6. History of Grade ≥2 active infections within 2 weeks 7. Known human immunodeficiency virus (HIV) infection 8. Seropositive for hepatitis B virus (HBV) 9. Seropositive for hepatitis C virus (HCV), or HCV-RNA viral levels are not detectable. 10. Any severe and/or uncontrolled medical conditions 11. History of myocardial infarction, unstable angina pectoris, coronary artery bypass graft, or cerebrovascular accident 12. Impaired cardiac function or clinically significant cardiac diseases 13. QTcF \>470 msec at screening 14. History of medically significant thromboembolic events or bleeding diathesis 15. Unresolved Grade \>1 toxicity 16. History of malignant biliary obstruction 17. Pregnant or breast-feeding