A Study of BL-M08D in Patients With Locally Advanced or Metastatic Digestive Tract Tumors and Other Solid Tumors

Inclusion Criteria: 1. Voluntarily sign the informed consent form and comply with the protocol requirements; 2. No gender restriction; 3. Age: ≥18 years and ≤75 years; 4. Expected survival time ≥3 months; 5. Locally advanced or metastatic gastrointestinal tumors and other solid tumors; 6. Agree to provide archival tumor tissue specimens from the primary or metastatic site within 3 years, or fresh tissue samples; 7. Must have at least one measurable lesion as defined by RECIST v1.1; 8. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1, with no deterioration within 2 weeks prior to the first dose; 9. Toxicities from prior anti-tumor therapy have recovered to ≤ Grade 1 as defined by NCI-CTCAE v6.0; 10. No severe cardiac dysfunction, with left ventricular ejection fraction ≥50%; 11. Organ function levels must meet the requirements; 12. Coagulation function: international normalized ratio ≤1.5, and activated partial thromboplastin time ≤1.5 × upper limit of normal; 13. Urine protein ≤1+ or ≤1000 mg/24 h; 14. For premenopausal women of childbearing potential, a pregnancy test must be performed within 7 days before starting treatment, with serum pregnancy results being negative, and they must be non-lactating; all enrolled patients (regardless of male or female) must adopt adequate barrier contraceptive measures throughout the entire treatment period and for 6 months after the completion of treatment; 15. The trial participant is capable and willing to comply with the visit schedule, treatment plan, laboratory tests, and other study-related procedures specified in the protocol. Exclusion Criteria: 1. Use of chemotherapy, biological therapy, immunotherapy, etc., within 4 weeks or 5 half-lives prior to the first dose; 2. History of severe cardiac or cerebrovascular disease; 3. Prolonged QTc interval, complete left bundle branch block, third-degree atrioventricular block, or frequent and uncontrolled arrhythmias; 4. Active autoimmune diseases and inflammatory diseases; 5. Diagnosis of another malignant tumor within 5 years prior to the first dose; 6. Unstable thrombotic events requiring therapeutic intervention within 6 months prior to the first dose; 7. Hypertension inadequately controlled by antihypertensive medication; 8. Poorly controlled blood glucose; 9. History of interstitial lung disease requiring hormone therapy, or current ILD, or radiation pneumonitis of Grade ≥2; 10. Severe impairment of respiratory function; 11. Active central nervous system metastases; 12. Previous or concurrent central nervous system disorders; 13. History of allergy to recombinant humanized antibodies or human-mouse chimeric antibodies, or allergy to any excipient component of BL-M08D1; 14. Previous organ transplantation or allogeneic hematopoietic stem cell transplantation; 15. Positive for human immunodeficiency virus antibody, active tuberculosis, active hepatitis B virus infection, or active hepatitis C virus infection; 16. Active infection requiring systemic treatment within 4 weeks prior to the first study drug administration; 17. Pleural, abdominal, or pericardial effusion requiring drainage and/or accompanied by symptoms within 4 weeks prior to the first study drug administration; 18. Imaging findings indicating tumor invasion or encasement of abdominal, thoracic, cervical, or other regions; 19. Use of another investigational drug within 4 weeks or 5 half-lives prior to the first dose; 20. Pregnant or breastfeeding women; 21. Other conditions deemed by the investigator to make the patient unsuitable for participation in this clinical trial.