A Study of BL-B16D1 in Patients With Locally Advanced or Metastatic Solid Tumors

Inclusion Criteria: 1. Sign the informed consent form voluntarily and follow the protocol requirements; 2. Gender is not limited; 3. Age: ≥18 years old and ≤75 years old (phase Ia); ≥18 years old (phase Ib); 4. Expected survival time ≥3 months; 5. locally advanced or metastatic solid tumors confirmed by histopathology and/or cytology that failed standard treatment or could not obtain standard treatment; 6. Consent to provide archival tumor tissue samples or fresh tissue samples from primary or metastatic lesions within 3 years; 7. At least one measurable lesion meeting the RECIST v1.1 definition was required; 8. ECOG 0 or 1; 9. The toxicity of previous antineoplastic therapy has returned to ≤ grade 1 as defined by NCI-CTCAE v5.0; 10. No severe cardiac dysfunction, left ventricular ejection fraction ≥50%; 11. The organ function level must meet the requirements if the patient has not received blood transfusion or hematopoietic stimulating factor therapy within 14 days before screening; 12. Coagulation function: international normalized ratio ≤1.5, and activated partial thromboplastin time ≤1.5ULN; 13. Urinary protein ≤2+ or ≤1000mg/24h; 14. For premenopausal women with childbearing potential, a pregnancy test must be performed within 7 days before starting treatment, serum pregnancy must be negative, and the patient must not be lactating; All enrolled patients (male or female) should use adequate contraception throughout the treatment cycle and for 6 months after completion of treatment. Exclusion Criteria: 1. Chemotherapy, biological therapy and other anti-tumor therapies have been used within 4 weeks or 5 half-lives before the first dose; Mitomycin and nitrosoureas were administered within 6 weeks before the first dose; Oral drugs such as fluorouracil; 2. History of severe heart disease; 3. Long QT, complete left bundle branch block, III degree atrioventricular block; 4. Active autoimmune and inflammatory diseases; 5. Other malignancies diagnosed within 5 years before the first dose; 6. Hypertension poorly controlled by two antihypertensive drugs; 7. Patients with poor glycemic control; 8. Present with grade ≥2 radiation pneumonitis according to the RTOG/EORTC definition; Previous history of ILD or current ILD, or suspicion of such disease during screening; 9. Complicated with pulmonary diseases leading to clinically severe respiratory function impairment; 10. Active central nervous system metastasis; 11. Patients with a history of allergy to recombinant humanized or human-mouse chimeric antibodies or to any of the excipients of BL-B16D1; 12. Received previous organ transplantation or allogeneic hematopoietic stem cell transplantation (Allo-HSCT); 13. The cumulative dose of anthracyclines \> 360 mg/m2 in previous (new) adjuvant therapy; 14. Human immunodeficiency virus antibody positive, active tuberculosis, active hepatitis B virus infection or active hepatitis C virus infection; 15. Severe infection occurred within 4 weeks before the first dose; Signs of pulmonary infection or active pulmonary inflammation within 2 weeks before the first dose; 16. Patients with massive or symptomatic effusions or poorly controlled effusions; 17. Had participated in another clinical trial within 4 weeks before the first dose; 18. Had the following ocular diseases: a. active infection or corneal ulcer; b. monocular vision; c. a history of corneal transplantation; d. Contact lens dependence; e. Uncontrolled glaucoma; f. Uncontrolled or progressive retinopathy, wet macular degeneration, etc.; 19. Other circumstances that the investigator deemed inappropriate for participation in the trial.