A Study of BL-B01D1+PD-1 Monoclonal Antibody in Patients With Recurrent or Metastatic Head and Neck Squamous Cell Carcinoma and Other Solid Tumors

Inclusion Criteria:

1. Subject volunteered to participate in the study and signed an informed consent;
2. Male or female aged ≥18 years and ≤75 years;
3. Expected survival time ≥3 months;
4. ECOG score 0-1;
5. Patients with recurrent or metastatic head and neck squamous cell carcinoma (non-nasopharyngeal carcinoma) and other solid tumors confirmed by histopathology and/or cytology;
6. Patients must provide a documented tumor tissue specimen of the primary or metastatic tumor within 3 years for PD-L1 testing and other testing;
7. At least one measurable lesion meeting the RECIST v1.1 definition was required;
8. No blood transfusion and no use of cell growth factors and/or platelet-raising drugs within 14 days before screening, and the organ function level must meet the requirements;
9. The toxicity of previous antineoplastic therapy has returned to ≤ grade 1 as defined by NCI-CTCAE v5.0;
10. For premenopausal women of childbearing potential, a pregnancy test must be performed within 7 days before the initiation of treatment, a serum or urine pregnancy test must be negative, and the patient must not be lactating; All enrolled patients should take adequate barrier contraception during the entire treatment cycle and for 6 months after the end of treatment.

Exclusion Criteria:

1. Prior treatment with an ADC drug with TOP I inhibitors as a toxin;
2. Before the first delivery within four weeks or five half-life used anti-tumor treatment; Palliative radiotherapy was given within 2 weeks before the first dose;
3. Received any previous systemic antitumor regimen for solid tumors such as recurrent or metastatic head and neck squamous cell carcinoma;
4. Had received immunotherapy and developed ≥ grade 3 irAE or ≥ grade 2 immune-related myocarditis;
5. Use of an immunomodulatory drug within 14 days before the first dose of study drug;
6. Systemic corticosteroids were required within 2 weeks before the first dose of the study;
7. Has a history of severe disease of heart head blood-vessel;
8. Active autoimmune and inflammatory diseases;
9. Other malignant tumors that progressed or required treatment within 3 years before the first dose;
10. With ILD requiring steroid treatment, current ILD, or suspected ILD at screening;
11. Presence of: a) poorly controlled diabetes mellitus before study treatment; b) poorly controlled hypertension; c) history of hypertensive crisis or hypertensive encephalopathy;
12. Unstable thrombotic events requiring therapeutic intervention within 6 months before screening;
13. Patients with active central nervous system metastasis;
14. Patients with pleural effusion, pericardial effusion or ascites with clinical symptoms or requiring repeated drainage;
15. Had allergic history to recombinant humanized antibody or human-mouse chimeric antibody or to any of BL-B01D1's excipients;
16. Prior organ transplantation or allogeneic hematopoietic stem cell transplantation (Allo-HSCT);
17. Human immunodeficiency virus antibody positive, active tuberculosis, active hepatitis B virus infection or active hepatitis C virus infection;
18. Active infection requiring systemic therapy;
19. Had participated in another clinical trial within 4 weeks before the first dose;
20. Who have a history of psychotropic drug abuse and cannot abstain from it or have mental disorders;
21. Other circumstances that the investigator deemed inappropriate for participation in the trial.