A Study of BL-B01D1 in Patients With Locally Advanced or Metastatic Solid Tumor

Prior treatment

• Chemotherapy, biological therapy, immunotherapy, radical radiotherapy, major surgery, targeted therapy (including small molecule inhibitor of tyrosine kinase), and other anti-tumor therapy within 4 weeks or 5 half-lives (whichever is shorter) prior to the first administration; mitomycin and nitrosoureas treatment within 6 weeks prior to the first administration; oral fluorouracil-like drugs such as S-1, capecitabine, or palliative radiotherapy within 2weeks prior to the first administration.
• Other malignant tumors were diagnosed within 5 years prior to the first administration with the following exceptions: basal cell carcinoma of the skin, squamous cell carcinoma of the skin and/or carcinoma in situ after radical resection.
• Unstable thrombotic events such as deep vein thrombosis, arterial thrombosis and pulmonary embolism requiring therapeutic intervention within 6 months prior to screening; Thrombus formation associated with infusion set is excluded.
• Previous recipients of organ transplantation or allogeneic hematopoietic stem cell transplantation (Allo-HSCT).
• In previous adjuvant therapy with anthracyclines, the cumulative dose of anthracyclines was \> 360 mg/m2.
• Participated in another clinical trial (calculated from the time of the last dose) within 4 weeks prior to the first dose.

Other illness

• Participants with history of severe heart disease, such as: symptomatic congestive heart failure (CHF) ≥ grade 2 (CTCAE 5.0), New York Heart Association (NYHA) ≥ grade 2 heart failure, history of transmural myocardial infarction, unstable angina pectoris etc.
• Active autoimmune diseases and inflammatory diseases, such as: systemic lupus erythematosus, psoriasis requiring systemic treatment, rheumatoid arthritis, inflammatory bowel disease and Hashimoto's thyroiditis, etc., except for type I diabetes, hypothyroidism that can be controlled only by alternative treatment, and skin diseases that do not require systemic treatment (such as vitiligo, psoriasis).
• Participants with poorly controlled hypertension by two kinds of antihypertensive drugs (systolic blood pressure\>150 mmHg or diastolic blood pressure\>100 mmHg).
• Participants have grade 3 lung disease defined according to NCI-CTCAE v5.0, or a history of interstitial lung disease (ILD).
• Symptoms of active central nervous system metastasis. However, patients with stable brain parenchymal metastases can be enrolled. Stable was defined as: a. The seizure-free state lasted for \> 12 weeks with or without the use of antiepileptic drugs; b. Glucocorticoid use is not required; c. Consecutive MRI scans (at least 8 weeks between scans) showed stable imaging status.
• Patients with a history of allergy to recombinant humanized antibody or mouse chimeric antibody or to any excipients of BL-B01D1.
• Positive human immunodeficiency virus antibody (HIVAb), active tuberculosis, active hepatitis B virus infection (HBV-DNA copy number \> 103 IU/ml) or active hepatitis C virus infection (HCV antibody positive and HCV-RNA \> lower limit of detection).
• Active infections requiring systemic treatment, such as severe pneumonia, bacteremia, septicemia, etc.
• The other conditions of participation in this clinical trial were not considered appropriate by the investigators.

Lab values

• Participants with prolonged QT interval (male QTc\> 450 msec or female QTc\> 470 msec), complete left bundle branch block, III grade atrioventricular block.

• Participants must sign the informed consent form voluntarily and follow the plan requirements.
• No gender limit.
• Age: ≥18 years old and ≤75 years old (stage Ia); ≥18 years old (stage Ib).
• Expected survival time ≥ 3 months.
• Locally advanced or metastatic solid tumor confirmed by histopathology and/or cytology, which are incurable or currently without standard treatment.
• Agrees to provide archived tumor tissue specimens or fresh tissue samples from the primary lesion or metastasis within 2 years; If a subject is unable to provide a tumor tissue sample, he/she may be enrolled after being evaluated by the investigator if other inclusion criteria are met.
• Participants must have at least one measurable lesion that meets the definition of RECIST v1.1.
• Physical fitness score ECOG 0 or 1 point
• Toxicity of previous antitumor therapy has returned to ≤ level 1 as defined by NCI-CTCAE v5.0 (except for asymptomatic laboratory abnormalities considered by the investigators, such as elevated ALP, hyperuricemia, and elevated blood glucose; Toxicities with no safety risk, such as hair loss and grade 2 peripheral neurotoxicity, were excluded. Or decreased hemoglobin except ≥90 g/L).
• No serious cardiac dysfunction, left ventricular ejection fraction (LVEF) ≥50%
• The organ function level must meet the following requirements: a) bone marrow function: absolute neutrophilic granulocyte count (ANC) ≥1.5×109/L, platelet count ≥90×109/L, hemoglobin ≥90 g/L; b) Liver function: total bilirubin (TBIL≤1.5 ULN), AST and ALT ≤2.5 ULN in patients without liver metastasis, AST and ALT ≤5.0 ULN in patients with liver metastasis; c) Kidney function: creatinine (Cr) ≤1.5 ULN, or creatinine clearance (Ccr) ≥50 mL/min (according to Cockcroft and Gault formula).
• Coagulation function: International normalized ratio (INR)≤1.5×ULN, and activated partial thromboplastin time (APTT)≤1.5ULN.
• Urinary protein ≤2+ or ≤1000mg/24h.
• For premenopausal women with childbearing potential, a pregnancy test must be taken within 7 days prior to the start of treatment. Serum or urine pregnancy must be negative and must be non-lactating; all participants (regardless of male or female) in the group should be treated throughout the treatment. Adequate barrier contraceptive measures should be taken during the treatment and 6 months after the treatment.