A Study of SI-B003, a PD-1/CTLA-4 Bispecific Antibody, in Patients With Advanced Solid Tumors

• Status: Recruiting
• Trial end date: 2022-09-01
• Target enrollment: 0
• Participant gender: All

Summary

In phase Ia study, the safety and tolerability of SI-B003 in patients with recurrent or metastatic solid tumors will be investigated to determine the dose-limiting toxicity (DLT), maximum tolerated dose (MTD) or maximum administered dose (MAD) for MTD is not reached of SI-B003.

In the phase Ib study, the safety and tolerability of SI-B003 in specific tumors will be further investigated by selecting multiple doses based on the results of phase Ia study or/and the fixed-dose administration method with the closest exposure level, and recommended phase II dose (RP2D) for phase II clinical studies will be determined.

• Phase: Phase 1
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: Sichuan Baili Pharmaceutical Co., Ltd.
• Collaborator: SystImmune Inc.

Criteria

Inclusion Criteria:

1. The participants could understand and sign the informed consent form, and must participate voluntarily.

2. No gender limit.

3. Age: ≥18 years old and ≤75 years old (phase Ia); ≥18 years old (phase Ib).

4. Expected survival time ≥ 3 months.

5. It is confirmed by histology or cytology as recurring or metastatic solid tumor, and there is disease progression confirmed by imaging or other objective evidence after receiving standard treatment; or the participant is a patient with a refractory solid tumor, or is intolerant to standard treatment or there are contraindications to standard treatment.

6. Agree to provide tumor tissue samples or fresh tissue samples from the primary tumor or metastasis within 6 months (only for stage Ib). If the patient is unable to provide tumor tissue samples, the research center needs to apply to the sponsor.

7. At least one measurable lesion that meets the definition of RECIST v1.1 at baseline (only for stage Ib).

8. Physical fitness score ECOG 0 or 1 point.

9. No serious cardiac dysfunction, left ventricular ejection fraction (LVEF) ≥50%, (hypersensitivity) troponin T10. The organ function within 7 days prior to the first administration meets the following requirements: a) Bone marrow: absolute neutrophil count (ANC) ≥1.5×109/L, hemoglobin ≥90 g/L, platelet count ≥100×109/L (participants with liver cancer ANC ≥75×109/L); b) Liver: total bilirubin (TBIL) ≤1.5 ULN (TBIL ≤3 ULN in participants with Gilbert's syndrome, liver cancer or liver metastasis), transaminase (AST/ALT) ≤ 3 ULN (for participants with liver cancer or liver metastasis ≤ 5.0 ULN); for participants with liver cancer or liver metastasis, transaminase ≥ 3 ULN and TBIL ≥ 1.5 ULN must be excluded; c) Kidney: Creatinine (Cr) ≤1.5 ULN and creatinine clearance rate (Ccr) ≥ 50mL/min (according to Cockcroft-Gault formula).

11. Female participants with fertility or male participants whose partners are fertile must take effective contraceptive measures from 7 days prior to the first administration to 24 weeks after the administration. Female participants with fertility must have a negative serum/urine pregnancy test in 7 days prior to the first dose.

12. The participants are capable and willing to comply with the visits, treatment plans, laboratory examinations and other study-related procedures stipulated in the study protocol.

Exclusion Criteria:

1. Symptoms of active central nervous system metastasis. However, participants with stable brain metastasis or stable epidural spinal cord compression history can be included. Stable is defined as: a. With or without antiepileptic drugs, the seizure-free state lasts for more than 12 weeks; b. There is no need to use glucocorticoids; c. Continuous multiple MRI (scanning interval at least 8 weeks) showed a stable state in imaging.

2. Those who have participated in any other clinical trials within 28 days prior to the administration of this trial, except for the clinical trials of listed drugs;

3. 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.

4. In 14 days prior to administration of this study, those who have received systemic corticosteroids (>10mg/day prednisone, or equivalent other corticosteroids) or immunosuppressive therapy should be excluded except for those who have received inhaled or topical corticosteroids, or hormone therapy of physiological replacement dose due to adrenal insufficiency.

5. Those who have received live virus vaccines (including live attenuated vaccines) within 28 days prior to the administration of this study.

6. Participants have grade 3 lung disease defined according to NCI-CTCAE v5.0, including participants with resting dyspnea, or requiring continuous oxygen therapy, or a history of interstitial lung disease (ILD).

7. Severe systemic infections occurred within 4 weeks prior to screening, including but not limited to severe pneumonia, bacteremia, or severe infection complications caused by fungi, bacteria, and viruses.

8. Participants at risk of active autoimmune diseases, or with a history of autoimmune diseases, including but not limited to Crohn's disease, ulcerative colitis, systemic lupus erythematosus, sarcoidosis, Wegener syndrome (polyangiitis granuloma Disease, Graves' disease, rheumatoid arthritis, pituitary inflammation, uveitis), autoimmune hepatitis, systemic sclerosis, Hashimoto's thyroiditis, autoimmune vasculitis, autoimmune neuropathy (Guillain-Barré syndrome), etc. Except for the following conditions: Type I diabetes, hormone replacement therapy for stable hypothyroidism (including hypothyroidism caused by autoimmune thyroid disease), psoriasis or vitiligo that does not require systemic treatment.

9. Complicated with other malignant tumors within 2 years prior to the first administration, except for cured skin squamous cell carcinoma, basal cell carcinoma, superficial bladder cancer, prostate/cervix/breast carcinoma in situ (only phase Ib).

10. Participants with human immunodeficiency virus antibody (HIVAb) positive, active tuberculosis, active hepatitis B virus infection (HBV-DNA copy number> 104) or hepatitis C virus (HCV) infection.

11. Participants with poorly controlled hypertension by two kinds of antihypertensive drugs (systolic blood pressure>150 mmHg or diastolic blood pressure>100 mmHg).

12. 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.

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

14. The toxicity of the previous anti-tumor therapy has not recovered to ≤1 (NCI-CTCAE v5.0) or the baseline level, except for peripheral neuropathy (need to be restored to ≤2) and hair loss.

15. Participants with allogeneic bone marrow or organ transplantation history.

16. Participants who have a history of allergies to recombinant humanized antibodies or human-mouse chimeric antibodies or any of the components of SI-B003.

17. In the adjuvant (or neoadjuvant) treatment of anthracyclines, the cumulative dose of anthracyclines is> 360 mg/m2.

18. Pregnant or breastfeeding women.

19. Other conditions that the investigator believes that it is not suitable for participating in this clinical trial.