SIBP-A18 injection for advanced malignant solid tumors

A Phase I Clinical Trial Evaluating the Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of SIBP-A18 Injection in the Treatment of Advanced Malignant Solid Tumor Patients

This will test whether SIBP-A18 injections are safe and can help adults with advanced solid tumors, including CLDN18.2-positive gastric, pancreatic, or biliary cancers.

Quick facts

• Phase: PHASE1
• Study type: Interventional
• Enrollment: 156 (estimated)
• Ages: 18 Years to 75 Years
• Sex: All
• Sponsor: Shanghai Institute Of Biological Products (industry)
• Drugs / interventions: chemotherapy, immunotherapy, radiation, prednisone
• Locations: 1 site (Beijing, Beijing Municipality)
• Trial ID: NCT06985368 on ClinicalTrials.gov

What this trial studies

This is an open-label, multi-stage Phase 1 program using single- and multiple-dose cohorts with dose escalation, dose expansion, and indication expansion components. Initial dose escalation will follow planned cohorts from 1.0 to 8.0 mg/kg with a possible 3+3 design, followed by dose expansion at selected levels and a determination of the recommended Phase 2 dose (RP2D). Key outcomes include safety, tolerability, pharmacokinetics, immunogenicity, effect on QT/QTc, and preliminary anti-tumor activity, with exploratory biomarker analyses. After RP2D is chosen, three indication-specific expansion cohorts of at least 30 participants each will be enrolled to further explore activity in CLDN18.2‑positive cancers.

Who should consider this trial

Good fit: Adults aged 18–75 with advanced solid tumors who have failed, are intolerant of, or lack standard treatments are eligible, with CLDN18.2-positive gastric, pancreatic, or biliary cancer patients prioritized for the indication-expansion phase.

Not a fit: Patients with effectively controlled disease on standard therapy, tumors lacking CLDN18.2 expression, or those with serious uncontrolled comorbidities are unlikely to benefit from participation.

Why it matters

Potential benefit: If successful, SIBP-A18 could provide a new targeted treatment option for patients with advanced solid tumors, especially those with CLDN18.2-positive disease who have exhausted standard therapies.

How similar studies have performed: Other CLDN18.2-targeted antibodies and antibody–drug conjugates have shown encouraging early signals in clinical testing, but SIBP-A18 itself is a novel agent that remains unproven.

Eligibility criteria

Inclusion Criteria:

* Age range from 18 to 75 years old (including boundary values), regardless of gender.
* The clinical diagnosis of enrolled participants should meet the following criteria:

  1. Dose escalation and dose expansion stage: Patients with advanced solid tumor diagnosed by histology and/or cytology, who have previously failed standard treatment, lack standard treatment regimens, are intolerant to standard treatment, or are currently not eligible for standard treatment.
  2. Indications expansion stage:

Queue 1: CLDN18.2 positive late stage gastric cancer/gastroesophageal junction cancer (GC/GEJC) confirmed by histology or cytology with standard treatment failure, intolerance, or no standard treatment.

Queue 2: Late stage CLDN18.2 positive PC confirmed histologically or cytologically with standard treatment failure, intolerance, or no standard treatment.

Queue 3: CLDN18.2 positive late biliary tract cancer (BTC) confirmed histologically or cytologically with standard treatment failure, intolerance, or no standard treatment.

* Willing and able to provide sufficient fresh collected or archived tumor tissue samples within two years.
* At least one measurable lesion must be selected as the target lesion (according to Response Evaluation Criteria In Solid Tumors (RECIST) v1.1 standard, computed tomography (CT) or magnetic resonance imaging (MRI)) (for lesions that have previously received radiotherapy, only with clear progression can they be selected as the target lesion).
* The patient has not previously received any form of topoisomerase I inhibitor in the past, including antibody drug conjugates
* ECOG score 0-1.
* Expected survival time ≥ 3 months.
* During the screening period, the main organ functions were basically normal (no medical support such as blood transfusion, granulocyte colony-stimulating factor (G-CSF), or other medical support was received within 14 days before the use of the investigational drug):

Blood routine: Absolute value of neutrophils (NE #) ≥ 1.5 × 10\^9/L, platelet (PLT) count

≥ 90 × 10 9/L, hemoglobin (HGB) ≥ 90 g/L.

* Women of childbearing age during the screening period who have a negative blood pregnancy test and are capable of reproduction (including male participants) have no pregnancy plan and voluntarily take effective contraceptive measures during the trial period and within 6 months after the last dose.
* Voluntarily participate in this study and sign an informed consent form.

Exclusion Criteria:

* Participants with the following tumors:

  * The participant has had other malignant tumors that have not been cured within the past 5 years (excluding malignant tumors that have been clearly cured, such as thyroid cancer, cured basal cell carcinoma of the skin, and cervical carcinoma in situ).
  * The participant has untreated imaging confirmed central nervous system metastasis.
  * Meningeal metastases.
  * Patients with brain metastases who have received systematic or curative brain metastasis treatment (radiotherapy or surgery) in the past, have been confirmed stable by imaging for at least 4 weeks, and have stopped systemic hormone, antiepileptic, convulsive drugs, and other treatments for more than 2 weeks without clinical symptoms can be enrolled.
* Participants with a history of previous treatment or surgery, or those who received the following anti-tumor treatments during the planned trial period:

  * Patients who accepted the instructions clearly containing traditional Chinese patent medicines and simple preparations with anti-tumor effect within 2 weeks before the first administration;
  * Patients undergoing adjuvant therapy within 6 months after surgery;
  * Patients who have not recovered from the toxicity of the previous anti-tumor treatment to normal or ≤ level 1 (excluding hair loss);
  * Patients who have undergone major surgery, radiation therapy, biological therapy, or chemotherapy within 4 weeks prior to their first administration, or who have received systemic treatment such as unhealed surgical wounds, ulcers or fractures, or other clinical trial drugs.
  * Patients who plan to receive any other anti-tumor treatment (chemotherapy, radiation therapy, immunotherapy, cytokine therapy other than erythropoietin) during the trial period should be excluded (excluding testosterone lowering therapy for prostate cancer patients).
  * The dose (prednisone\>10 mg/d or equivalent) at which immunosuppressive effects are achieved by receiving immunosuppressive agents or systemic corticosteroids within one week prior to the use of the investigational drug.
* Participants with a history of previous illnesses or laboratory tests that show the following abnormalities:

Individuals with abnormal coagulation function and a tendency to bleed, or who are undergoing thrombolysis or anticoagulation treatment or have lost blood or donated more than 400 mL within 2 months prior to administration.

* Have a history of immunodeficiency, including HIV testing positive, or other acquired or congenital immunodeficiency diseases, or a history of organ transplantation.
* Have a clear history of neurological or psychiatric disorders, including epilepsy or dementia.

  * Screening period for syphilis spiral antibody positive individuals; Individuals with active hepatitis B virus (HBV) and hepatitis C virus (HCV) infections; Except those with stable hepatitis B (DNA titer below the lower detection limit) and cured hepatitis C (HCV RNA test negative) after drug treatment.
  * Patients with ascites, pleural effusion, and pericardial effusion accompanied by clinical symptoms during the screening period who require drainage, or those who have undergone serous cavity drainage within 4 weeks before the first administration.
  * The screening period is accompanied by severe, progressive, or uncontrollable diseases, and the researcher's evaluation determines that the participation of the participants in the study will increase the risk. Including but not limited to:
* Cerebrovascular accidents or transient ischemic attacks (within the first 6 months of screening); Suffering from heart disease judged by the researcher as unsuitable for participation in this trial, with a severity of cardiac or renal dysfunction ≥ Level II.

  * According to the researcher's judgment, there are accompanying diseases that seriously endanger patient safety or affect patient completion of the study.

    1. Hypertension that cannot be controlled clinically.
    2. Diabetes with poor drug control.
    3. Clinically significant thyroid diseases judged by researchers as unsuitable for inclusion.
    4. Serious infections that occurred within 4 weeks prior to initiating research treatment.
  * Individuals with a history of severe allergies to protein products, Chinese hamster ovary cell (CHO) cell products, and other recombinant human or humanized antibodies, or to the components of the investigational drug.
  * Pregnant and lactating women.
  * Patients deemed unsuitable for inclusion by researchers.

Where this trial is running

Beijing, Beijing Municipality

• Chinese Academy of Medical Sciences and Peking Union Medical College — Beijing, Beijing Municipality, China (RECRUITING)

Study contacts

• Principal investigator: Jing Huang, Docter — Chinese Academy of Medical Sciences and Peking Union Medical College
• Study coordinator: Dandan Chen, Master

Conditions: Solid Tumor Malignancy, ADC, Safety, Efficacy, Pharmacokinetics