A Study of MRG004A in Patients With Tissue Factor Positive Advanced or Metastatic Solid Tumors

Inclusion Criteria:

1. Understands and provides written informed consent and willing to follow therequirements specified in protocol.
2. Age ≥18 years.
3. Life expectancy ≥6 months.
4. For Part B patients, documented Tissue Factor (TF) presence in tumor biopsy specimensobtained from archival or re-biopsy specimens by immunohistochemistry (IHC) proteinexpression.
5. Must have histologically or cytologically confirmed unresectable or metastatic cancerwith documented disease progression during prior therapy, or relapse or progressionfollowing approved standard therapy for their tumor types- Part A and Part B.
6. Part B: Patients who have documented progression during or relapse following standardtherapy, no further treatment options that are known to improve survival, andparticipation in a clinical trial is a reasonable therapeutic option.
7. Patients must have measurable disease per RECIST v1.1.
8. ECOG performance status of 0 or 1.
9. Acceptable bone marrow, hepatic, cardiac, renal, and coagulation function.
10. A negative serum pregnancy test if female and aged between 18-55 years old.
11. Patients, both females and males, of reproductive potential must agree to use adequatecontraception during and for 180 days after the last infusion of MRG004A.

Exclusion Criteria:

1. Archival or biopsy tumor shows TF IHC membrane or cytosolic score of zero, noTF-positive expression or no TF-positive staining in Part B patients.
2. Toxicities (except alopecia & fatigue) due to prior antitumor therapy are greater thanCTCAE v5.0 Grade 1.
3. Toxicities due to prior radiotherapy that have not resolved to Grade ≤ 1 CTCAE v5.0 atleast 21 days prior to the first treatment.
4. Untreated, unstable or uncontrolled central nervous system (CNS) metastases.
5. Any other type of anti-cancer therapy within 21 days of the first dose of studytreatment. Use of any other type of anti-cancer treatment is prohibited throughout thestudy.
6. Patients with increased bleeding risk.
7. Presence of severe cardiac dysfunction.
8. Pulmonary embolism or deep vein thrombosis within 3 months prior to the first dose ofstudy drug.
9. Concurrent malignancy within 5 years prior to entry.
10. Uncontrolled or poorly controlled hypertension.
11. History of ventricular tachycardia, or torsade des pointes.
12. History of moderate to severe dyspnea at rest.
13. Major surgery within 4 weeks of the first dose of study treatment and not fullyrecovered. Minor surgery within 2 weeks prior to study treatment.
14. Known allergic reactions to any component or excipient of MRG004A or known allergicreactions to other prior anti-TF (including investigational) or other monoclonalantibody ≥ Grade 3.
15. Patients who have any known liver disease, including chronic hepatitis B, hepatitis C,autoimmune hepatic disorders, primary biliary cirrhosis or sclerosing cholangitis;Patients who have concurrent, serious, uncontrolled infections or known infection withHIV, or have a diagnosed acquired immunodeficiency syndrome (AIDS); or an uncontrolledautoimmune disease, or have undergone organ transplant.
16. Active uncontrolled bacterial, viral, fungal, rickettsial, or parasitic infection.
17. Use of systemic corticosteroids within 4 weeks prior to the first dose of treatment.
18. Use of strong CYP3A4 inhibitors or inducers with MRG004A.
19. Other excluded medications or treatment: therapeutic anti-coagulative, or long-termanti-platelet treatment; multivitamins, calcium, vitamin D, and prophylacticanti-RANKL (denosumab) and zoledronic acid therapies for bone metastases are allowed.
20. Any patient with a positive pregnancy or is breast-feeding.
21. Any severe and/or uncontrolled systemic disease that at the discretion of investigatorand sponsor makes it undesirable for the patient to participate in this study.