QL1706 Plus Bevacizumab for Unresectable or Metastatic MSI-H/dMMR CRC

Qianfoshan Hospital

Status and phase

Begins enrollment this month

Phase 2

Conditions

Metastatic Colorectal Cancer (CRC)

MSI-H/dMMR Colorectal Cancer

Unresectable Colorectal Cancer

Treatments

Drug: Bevacizumab

Drug: QL1706

Study type

Interventional

Funder types

Other

Identifiers

NCT07009145

YXLL-KY-2025(092)

Details and patient eligibility

About

This is a single-arm, multi-center, exploratory study evaluating the efficacy and safety of iparomlimab and tuvonralimab (QL1706) in combination with bevacizumab for the treatment of patients with microsatellite instability-high (MSI-H) or mismatch repair-deficient (dMMR) unresectable or metastatic colorectal cancer. Eligible participants who meet the inclusion and exclusion criteria will provide written informed consent and receive QL1706 at 5.0 mg/kg and bevacizumab at 7.5 mg/kg on Day 1 of every 3-week cycle (Q3W), until disease progression or completion of 2 years of treatment. The primary endpoint of this study is objective response rate (ORR). Secondary endpoints include disease control rate (DCR), duration of response (DoR), progression-free survival (PFS), overall survival (OS), PFS and OS rates at 6, 12, and 24 months, and safety.

Enrollment

22 estimated patients

Sex

All

Ages

18 to 80 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Voluntarily signs the informed consent form.
Aged between 18 and 80 years (inclusive) at the time of consent; no gender restriction.
Histologically confirmed unresectable locally advanced or metastatic colorectal cancer.
At least one measurable target lesion according to RECIST v1.1.
Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
No prior immunotherapy for unresectable locally advanced or metastatic colorectal cancer.
If previously treated with standard neoadjuvant or adjuvant therapy, the interval from the last dose to the first study treatment must be ≥ 6 months.
Willing and able to provide tumor tissue and blood samples for MSI, RAS, BRAF, and PD-L1 testing.
Estimated life expectancy of ≥ 12 months.
Appropriate laboratory values must be met at screening.
Female participants must be non-lactating, and have a negative pregnancy test result prior to enrollment.
Participants of childbearing potential must agree to use effective contraception from the time of informed consent until at least 180 days after the last dose of study treatment.

Exclusion criteria

Known history of severe allergic reactions to iparomlimab and tuvonralimab or bevacizumab.
Active malignancy other than colorectal cancer within 5 years prior to first treatment.
Large tumor lesions, especially those previously irradiated, with signs of bleeding.
Imaging showing tumor invasion of major blood vessels (e.g., pulmonary artery or superior vena cava), including encasement or invasion of the vessel lumen.
Brain metastases (asymptomatic or treated symptomatic brain metastases stable for >4 weeks allowed).
Active autoimmune disease requiring systemic treatment.
Active pulmonary diseases such as tuberculosis, radiation pneumonitis, drug-induced pneumonitis, or severe pulmonary dysfunction during screening.
Requirement for long-term or high-dose NSAIDs (aspirin >325 mg) or anticoagulant therapy.
History of severe gastrointestinal events within 6 months prior to first treatment.
Severe intestinal obstruction symptoms or signs and unretrieved intestinal stents at screening.
Cardiovascular or cerebrovascular diseases including but not limited to: NYHA class > II heart failure; unstable or severe angina; myocardial infarction or stroke within 6 months; atrial fibrillation or other arrhythmias requiring treatment; symptomatic superior vena cava syndrome; prolonged QT interval (male QT > 450 ms; female QTc > 470 ms); uncontrolled hypertension despite medication (SBP >140 mmHg and/or DBP >90 mmHg) or history of hypertensive crisis or encephalopathy.
Known bleeding disorders or coagulopathies.
Uncontrolled pleural, pericardial, or ascitic effusions requiring drainage.
Active infection or unexplained fever >38.5°C at screening (cancer-related fever allowed).
Use of systemic broad-spectrum antibiotics within 30 days prior to first treatment.
Systemic corticosteroids (>10 mg prednisone equivalent daily) or immunosuppressants within 14 days prior to first treatment, or immunostimulants within 4 weeks.
Major surgery, severe fractures, or therapeutic clinical trials within 4 weeks prior to first treatment; herbal treatment within 2 weeks.
Ongoing adverse events from prior antitumor therapy greater than grade 1.
HIV infection, other congenital or acquired immunodeficiencies, or history of organ or allogeneic bone marrow transplantation (except corneal transplantation).
Positive hepatitis B surface antigen (HBsAg) and/or hepatitis B core antibody (HBcAb) with HBV DNA >10⁴ copies/mL (~2000 IU/mL); or positive hepatitis C antibody with HCV RNA >10³ copies/mL; co-infection with HBV and HCV excluded.
Vaccination with live or attenuated vaccines within 30 days prior to first treatment.
Prior treatment with immune checkpoint inhibitors (e.g., anti-PD-1, anti-PD-L1, anti-CTLA-4, anti-OX-40, anti-CD137).
Prior adjuvant targeted therapy against EGFR, VEGF, or VEGFR (e.g., bevacizumab, cetuximab, panitumumab, apatinib, regorafenib, anlotinib).
Psychiatric disorders, epilepsy, dementia, or substance abuse that may affect compliance.
Other conditions or lab abnormalities that may interfere with study participation or confound results as judged by investigators or sponsors.