A Study to Evaluate the Tolerance and Pharmacokinetics of TQB2618 Injection in Subjects With Advanced Solid Tumors

Inclusion Criteria: * 1\. Diagnosed as advanced malignant solid tumors and have failed standard treatments or lack effective treatments; 2. 18-75 years old; Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 1; Life expectancy ≥12 weeks; 3. Has at least one measurable lesion; 4. The function of main organs is normal; 5. Female patients of childbearing age must be negative in serum or urine HCG within 7 days before enrollment in the study, and must be non-lactating; patients should agree to use contraceptive measures during the study period and within 6 months after the end of the study period; 6. Understood and signed an informed consent form. Exclusion Criteria: * 1\. Has Autoimmune disease; 2. Has received allogeneic bone marrow transplantation or solid organ transplantation; 3. Has brain disease or brain metastases; 4. Has cavity effusion; 5. Has cardiovascular diseases; 6. Has immunodeficiency diseases; 7. Has liver disease; 8. Has infection; 9. Has diabetes; 10. Has a history of psychotropic drug abuse or have a mental disorder; 11. Have a history of severe allergy to macromolecular drugs or allergy to known components of TQB2618 injection; 12. Has other malignant tumors within 2 years before the first medication; 13. Has received other anti-cancer drugs or anti-cancer treatments, or major surgical operations within 4 weeks before the first medication; 14. Has received any live vaccines or vaccines to prevent infectious diseases within 4 weeks before the first medication; 15. Has received local radiotherapy within 1 week before the first medication; 16. Toxicity (excluding hair loss) caused by previous anti-tumor therapy that has not recovered to CTC AE V5.0 level 1 or below; 17. Has major wound, severe ulcer or fracture that has not healed before 1 day before the first medication; 18. Has used systemic hormones, immune agonists, inhibitors, and regulators before 1 day before the first medication; 19. According to the judgement of the researchers, there are other factors that subjects are not suitable for the study.