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

Study Overview
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Brief Summary
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In phase Ia study, the safety and tolerability of BL-B01D1 in patients with locally advanced or metastatic gastrointestinal tumor and other solid tumor will be investigated to determine the dose-limiting toxicity (DLT), maximum tolerated dose (MTD) of BL-B01D1. In phase Ib study, the safety and tolerability of BL-B01D1 at the phase Ia recommended dose will be further investigated, and recommended phase II dose (RP2D) for phase II clinical studies will be determined. In addition, the preliminary efficacy, pharmacokinetic characteristics, and immunogenicity of BL-B01D1 in patients with locally advanced or metastatic gastrointestinal tumor and other solid tumor will be evaluated.

Official Title
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A Phase I Clinical Study to Evaluate the Safety, Tolerability, Pharmacokinetic Characteristics and Preliminary Efficacy of BL-B01D1 in Patients With Locally Advanced or Metastatic Gastrointestinal Tumor and Other Solid Tumor

Conditions
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Gastrointestinal Tumor

Intervention / Treatment
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* Drug: BL-B01D1


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Participants must sign the informed consent form voluntarily and follow the plan requirements. No gender limit. Age: ≥18 years old and ≤75 years old (phase Ia); ≥18 years old (phase Ib). Expected survival time ≥ 3 months. Patients with locally advanced or metastatic triple-negative breast cancer or other solid tumors who have been diagnosed histopathologically and/or cytologically as failing standard therapy, or who are not eligible for standard therapy at this stage, and who are inoperable. Agree to provide archived tumor tissue samples or fresh tissue samples from the primary tumor or metastatic tumor within 3 years (TROP2 protein expression in tumor pathological tissue to explore the correlation between TROP2 protein expression and BL-M02D1 validity index); If subjects are unable to provide tumor tissue samples, they will be admitted after evaluation by the investigator if other admission criteria are met. Participants must have at least one assessable lesion as defined by RECIST V1.1. Has an Eastern Cooperative Oncology Group performance status (ECOG PS) 0-1 The toxicity of previous antitumor therapy was restored to ≤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, grade 2 peripheral neurotoxicity, were excluded). Has adequate organ function before registration, defined as: a) Bone marrow function: Absolute neutrophil count (ANC) ≥1.5×109/L, Platelet count ≥90×109/L, Hemoglobin ≥90 g/L; B) Hepatic function: Total bilirubin (TBIL≤1.5 ULN), AST and ALT ≤2.5 ULN for participants without liver metastasis, AST and ALT ≤5.0 ULN for liver metastases; c) Renal function: Creatinine (Cr) ≤1.5 ULN, or creatinine clearance (Ccr) ≥50 mL/min (according to the Cockcroft and Gault formula). Coagulation function: International normalized ratio (INR)≤1.5, 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. Adequate barrier contraceptive measures should be taken during the treatment and 6 months after the end of treatment for all participants (regardless of male or female). Exclusion Criteria: Patients screened for any of the following conditions will not be included in this study: 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. Prior treatment with ADC drugs targeting TROP2 or ADC drugs using camptothecin derivatives (topoisomerase I inhibitors) as toxins. 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. Participants with prolonged QT interval (male QTc> 450 msec or female QTc> 470 msec), complete left bundle branch block, III grade atrioventricular block. 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). The presence of a second primary tumor within 5 years prior to initial administration, except for radical basal cell carcinoma of the skin, squamous cell carcinoma of the skin, and/or radical resected carcinoma in situ. Screening for unstable thrombotic events such as deep vein thrombosis, arterial thrombosis and pulmonary embolism requiring therapeutic intervention within the first 6 months; Infusion device-related thrombosis is excluded; 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. 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. 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. Positive human immunodeficiency virus antibody (HIVAb), active tuberculosis, active hepatitis B virus infection (HBV-DNA copy number > 103IU/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. Participated in another clinical trial (calculated from the time of the last dose) within 4 weeks prior to the first dose. The other conditions of participation in this clinical trial were not considered appropriate by the investigators.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Sequential Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Study treatment<br>Participants receive BL-B01D1 as intravenous infusion for the first cycle (3 weeks). Participants with clinical benefit could receive additional treatment for more cycles. The administration will be terminated because of disease progression or intolerable toxicity occurring or other reasons. | Drug: BL-B01D1<br>* Administration by intravenous infusion<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Phase Ia: Dose limiting toxicity (DLT) | DLTs are assessed according to NCI-CTCAE v5.0 during the first cycle and defined as occurrence of any of the toxicities in DLT definition if judged by the investigator to be possibly, probably or definitely related to study drug administration. | Up to 21 days after the first dose | 
| Phase Ia: Maximum tolerated dose (MTD) | MTD is defined as the highest dose level at which no more than 1 in 6 participants experienced a DLT during the first cycle . | Up to 21 days after the first dose | 
| Phase Ib: Recommended Phase II Dose (RP2D) | The RP2D is defined as the dose level chosen by the sponsor (in consultation with the investigators) for phase II study, based on safety, tolerability, efficacy, PK, and PD data collected during the dose escalation study of BL-B01D1 | Up to 21 days after the first dose | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Treatment-Emergent Adverse Event (TEAE) | TEAE is defined as any unfavorable and unintended change in the structure, function, or chemistry of the body temporally emerging, or any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a pre-existing condition during the treatment of BL-B01D1 . The type, frequency and severity of TEAE will be evaluated during the treatment of BL-B01D1 . | Up to approximately 24 months | 
| Cmax | Maximum serum concentration (Cmax) of BL-B01D1 will be investigated. | Up to 21 days after the first dose | 
| Tmax | Time to maximum serum concentration (Tmax) of BL-B01D1 will be investigated | Up to 21 days after the first dose | 
| T1/2 | Half-life (T1/2) of BL-B01D1 will be investigated | Up to 21 days after the first dose | 
| AUC0-t | AUC0-t is defined as area under the serum concentration-time curve from time 0 to the time of the last measurable concentration. | Up to 21 days after the first dose | 
| CL (Clearance) | CL in the serum of BL-B01D1 per unit of time will be investigated | Up to 21 days after the first dose | 
| Ctrough | Ctough is defined as the lowest serum concentration of BL-B01D1 prior to the next dose will be administered | Up to 21 days after the first dose | 
| ADA (anti-drug antibody) | Incidence and titer of ADA of BL-B01D1 will be evaluated | Up to approximately 24 months | 
| Nab (neutralizing antibody) | Incidence and titer of Nab of BL-B01D1 will be evaluated. | Up to approximately 24 months | 
| Objective Response Rate (ORR) | ORR is defined as the percentage of participants, who has a CR (disappearance of all target lesions) or PR (at least a 30% decrease in the sum of diameters of target lesions). The percentage of participants who experiences a confirmed CR or PR is according to RECIST 1.1. | Up to approximately 24 months | 
| Disease Control Rate (DCR) | The DCR is defined as the percentage of participants who has a CR, PR, or Stable Disease (SD: neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease [PD: at least a 20% increase in the sum of diameters of target lesions and an absolute increase of at least 5 mm. The appearance of one or more new lesions is also considered PD]). | Up to approximately 24 months | 
| Duration of Response (DOR) | The DOR for a responder is defined as the time from the participant's initial objective response to the first date of either disease progression or death, whichever occurs first. | Up to approximately 24 months | 
| Progression-free Survival (PFS) | The PFS is defined as the time from the participant's first dose of BL-B01D1 to the first date of either disease progression or death, whichever occurs first. | Up to approximately 24 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Esophageal Cancer (EC), Gastric Cancer (GC), Pancreatic Cancer (PC), Colorectal Cancer (CRC)