Inclusion Criteria:
1. Age 18-75 (inclusive).
2. The Eastern Cooperative Oncology Group (ECOG) score ≤2 and Estimated life expectancy of more than 3 months.
3. Histopathological confirmed advanced or metastatic solid tumors failed to at least first-line treatment or initially diagnosed advanced/metastatic solid tumors that have no National Comprehensive Cancer Network (NCCN) guideline recommended standard firstline therapy. Tumor types include but are not limited to:biliary malignancies, pancreatic cancer, lung cancer, breast cancer, head and neck malignancies, gynecological tumors, etc.
4. The expression of CD73 or AXL antigen is≥50%.
5. At least one measurable lesion at baseline per RECIST version 1.1.
6. Fresh solid tumor samples or formalin-fixed paraffin embedded tumor archival samples within 6 months are necessary; Fresh tumor samples are preferred. Subjects are willing to accept tumor rebiopsy in the process of this study.
7. Adequate organ function as defined by the following criteria:
* Absolute neutrophil count (ANC) ≥ 1 x 10\^9/L, Platelet count ≥75 x 10\^9/ L, hemoglobin (Hgb) ≥ 90g/L ;
* Serum creatinine≤1.5 upper limit of normal (ULN) or creatinine clearance (as estimated by Cockcroft Gault) ≥60 mL/min;
* Serum aspartate amino transferase (AST) and alanine aminotransferase (ALT), ≤3.0 x ULN (≤5 x ULN for patients with liver cancer or metastases); Total serum bilirubin ≤1.5 x ULN(≤3 x ULN for patients with liver cancer or metastases);
* Cardiac ejection fraction ≥ 50%, no evidence of pericardial effusion as determined by an echocardiogram (ECHO), and no clinically significant electrocardiogram (ECG) findings;
* International Normalized Ratio (INR) ≤ 1.5 times the upper limit of normal (ULN), and Activated Partial Thromboplastin Time (APTT) ≤ 1.5 times ULN;
* Baseline oxygen saturation \>91% on room air.
8. Previous treatment must be completed for more than 4 weeks prior to the enrollment of this study, and subjects have recovered to \<= grade 1 toxicity (except for hematological toxicities and clinically non-significant toxicities such as alopecia).
9. Pregnancy tests for women of childbearing age shall be negative; Both men and women agreed to use effective contraception during treatment and during the subsequent 1 year.
10. Ability to understand and sign a written informed consent document.
Exclusion Criteria:
1. Subjects are being treated with either corticosteroids (\>10 mg daily prednisone equivalent) or other immunosuppressive medications within 14 days of enrollment.
2. Received cytotoxic chemicals, monoclonal antibodies, immunotherapy, targeted therapy or other anti-tumor therapy within 4 weeks or 5 half-lives before enrollment.
3. Pregnant, lactating, or breastfeeding females.
4. Known positive test result for human immunodeficiency virus (HIV) or acquired immune deficiency syndrome (AIDS);Active infection of hepatitis B virus (HBV), or hepatitis C virus (HCV).
5. History of allergy or intolerance to study drug components.
6. Prior organ allograft transplantations or allogeneic hematopoietic stem cell transplantation.
7. Major surgery or trauma occurred within 28 days prior to enrollment, or major side effects have not been recovered.
8. Known brain metastases or active central nervous system (CNS).Subjects with CNS metastases who were treated with radiotherapy for at least 3 months prior to enrollment, have no central nervous symptoms and are off corticosteroids, are eligible for enrollment, but require a brain MRI screening.
9. Previous or concurrent cancer within 5 years prior to treatment start except for curatively treated cervical cancer in situ, non-melanoma skin cancer, superficial bladder tumors.
10. Uncontrolled intercurrent illness, including ongoing or active systemic infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia (excluding insignificant sinus bradycardia and sinus tachycardia) or psychiatric illness/social situations and any other illness that would limit compliance with study requirements and jeopardize the safety of the patient.
11. Active bleeding or known hemorrhagic tendency.
12. Vaccination within 30 days of study enrollment.
13. Being participating any other trials or withdraw within 4 weeks.
14. Researchers believe that other reasons are not suitable for clinical trials.
