A Phase 1/2 interventional study of CRB-601 monoclonal antibody and Anti-PD-1 monoclonal antibody in Solid Tumor, sponsored by Corbus Pharmaceuticals Inc.. Recruiting at 26 sites in 2 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-06-03.
Sponsored by Corbus Pharmaceuticals Inc. · Phase 1/2, Interventional, and Treatment
The purpose of this study is to determine the safety, blood concentrations and treatment effect of CRB-601 in combination with immunotherapy in patients who have advanced solid tumors (cancer) and have exhausted other therapeutic options.CRB-601 targets a protein called avb8 integrin which is expressed by some cancers and not others. This study will focus on tumor types which are know to highly or moderately express this protein.
Researchers will evaluate the side effects caused by treatment, levels of CRB-601 in the blood, and the effect on the participant cancer. This will help researchers understand the right dose of CRB-601 to use for treatment and whether it is an effective treatment to combine with standard of care treatments such as immunotherapy. It will also help the researchers understand whether combining CRB-601 with standard-of-care immunotherapy and immune-priming radiotherapy is a safe and effective approach to treat cancer.
Participants in the study will receive CRB-601 via an infusion every two weeks either alone or in combination with immunotherapy.
There will be assessments to check on the participants general health status (including blood tests) and adverse effects. Participants will also receive regular CT or MRI scans to evaluate the effect of CRB-601 on their cancer. Participants will continue to visit the clinic every two weeks while they are receiving benefit from treatment. If their cancer progresses, participants will be asked to continue to be followed-up by the researchers to understand long-term outcomes, even if they receive other treatments.
CRB-601-01 is a three-part interventional study which aims to:
The study will be run in 3 parts (A-C), run sequentially.
Part A Dose Escalation
Part A is designed to evaluate the safety, tolerability, and determine the MTD of CRB-601 administered as monotherapy in participants with select relapsed/refractory solid tumors that are known to express avb8 integrin. All participants will have had disease progression (PD) after at least one line of therapy or have no other standard therapy of proven clinical benefit currently available or be recommended based on the investigator's individual risk-benefit assessment for the participant.
In Part A, doses will be escalated following the standard Bayesian Optimal Interval Design (BOIN) to determine the MTD and PADR or CRB-601. Three (3) dose groups treated on a 28 cycle with dosing every 2 weeks (Q2W) are predetermined. The target toxicity level is 0.3, the maximum number of participants that can be enrolled at each dose level is 12 participants and the maximum sample size of the BOIN design is 36. Determination of dose-limiting toxicities (DLT) will be based on toxicities observed during the DLT observation period (first 28-days or Cycle 1). Dose escalation /de-escalation decisions are made on the basis of occurrence of DLT.
Part B Combination Safety Lead-in and Signal Seeking
Part B is designed to assess the safety and tolerability of CRB-601 combined with anti-PD(L)-1 therapy. There will be two distinct phases to Part B, a safety lead-in phase with a two-step dose-escalation and an Expansion Phase to seek efficacy signals in select solid tumors. The following cohorts will be initiated:
Safety Lead-in
Additional participants with select tumor-types showing preliminary efficacy will be enrolled in an expansions phase.
Part C Dose Optimization
Part C will follow a time-to-event Bayesian optimal Phase 2 (TOP Bayesian) study design developed for cancer immunotherapy. The aim of dose optimization is to determine the recommended Phase 2 dose (RP2D) by evaluating the efficacy of CRB-601 in combination with anti-PD(L)-1 (in terms of objective response rate [ORR]) when administered at two dose levels in a tumor-type selected based on preliminary efficacy observed in Part A and B. Participants will be randomized into one of two dose levels (low-dose CRB-601 group and high-dose CRB- 601 group) of 12-20 participants. In each arm, eligible participants will receive CRB-601 in combination with anti-PD(L)-1and be monitored for safety and efficacy.
For all enrolled participants (Parts A to C), study intervention will continue until any of the pre-defined criteria for discontinuation of study intervention are met, including intolerable toxicity, death, withdrawal of consent for study intervention, start of a new anti-cancer therapy, or investigator determined PD according to RECIST 1.1 or symptomatic deterioration attributed to PD.
General
In all parts, tumor response will be evaluated by the investigator according to RECIST v1.. During the post-treatment follow-up period, only participants who had discontinued study intervention for reasons other than PD or start of a new anti-cancer therapy (e.g., due to toxicity) will undergo tumor assessments. In these participants, tumor assessments will continue until death, confirmed radiographic PD according to RECIST v1.1, symptomatic deterioration attributed to PD, initiation of a subsequent anti cancer therapy, withdrawal of consent for the study or any of the other pre defined criteria for withdrawal from the study are met, whichever occurs first. All discontinued participants (with the exception of the reason of death) will be followed for 3 months for immune-related adverse events (irAEs) unless consent is refused in writing by the participant. Lesions selected for on-treatment biopsy, will be omitted from tumor assessments by RECIST v1.1. Clinical and laboratory adverse events (AEs) will be reported and graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) v5.0. Guidelines for dose interruptions (e.g., for toxicity) are included in the protocol.
Biomarkers will also be measured. Collection of off- and on-treatment biopsies in Parts A to C are considered mandatory, unless agreed with the sponsor. Fresh tumor biopsies or archival tumor formalin fixed paraffin embedded (FFPE) samples are acceptable for baseline evaluation, and on-treatment samples will be collected on C2D15. Blood samples for biomarker and cytokine/chemokine assessments will also be collected.
Corbus Pharmaceuticals Inc. is the lead sponsor of 10 studies on the registry; 3 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Line of therapy
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
RECIST
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Dose 1 of CRB-601 (3mg/Kg) administered intravenously every two weeks
Drug: CRB-601 monoclonal antibody
Dose 2 of CRB-601 (10mg/Kg) administered intravenously every two weeks
Drug: CRB-601 monoclonal antibody
Dose 3 of CRB-601 (30mg/Kg) administered intravenously every two weeks
Drug: CRB-601 monoclonal antibody
Dose (defined in Part A) of CRB-601 administered intravenously in combination with anti-PD(L)-1 therapy dosed as per label.
Drug: CRB-601 monoclonal antibody · Drug: Anti-PD-1 monoclonal antibody
High dose CRB-601 (defined in Part A) of CRB-601 administered intravenously in combination with anti-PD(L)-1 therapy dosed per label.
Drug: CRB-601 monoclonal antibody · Drug: Anti-PD-1 monoclonal antibody
Dose (defined in Part B/ Safety Lead-In) or CRB-601 administered intravenously in combination with anti-PD(L)-1 therapy dosed per label.
Drug: CRB-601 monoclonal antibody · Drug: Anti-PD-1 monoclonal antibody
Participants will receive a low dose of CRB-601 (defined in Part A \&B) in combination with standard of care dose of anti-PD(L)-1 therapy.
Drug: CRB-601 monoclonal antibody · Drug: Anti-PD-1 monoclonal antibody
Participants will receive a high dose of CRB-601 (defined in Part A \&B) in combination with standard of care dose of anti-PD(L)-1 therapy.
Drug: CRB-601 monoclonal antibody · Drug: Anti-PD-1 monoclonal antibody
CRB-601
Anti-PD(L)-1 used as per label
Occurance of Dose-limiting toxicities
Time frame: 28 days
Characterize the safety of CRB-601 in combination anti-PD(L)1 therapy
Incidence of treatment emergent adverse events and clinically significant changes in laboratory parameters, ECG, vital signs and physical exam findings over treatment duration
Time frame: 6 months
To evaluate the efficacy of CRB-601 in terms of DCR when administered in combination with anti-PD(L)-1
Disease Control Rate (Complete Responses plus Partial Responses plus Stable Disease for at least 4 months as determined by the Investigator using RECIST 1.1.
Time frame: 6 months
To evaluate the preliminary antitumor activity of CRB-601 in combination with anti-PD(L)1 therapy
Calculation of the Overall Response Rate (CR + PR + SD as determined by the Investigator using RECIST 1.1)
Time frame: 6 months
To characterize the PK profile of CRB-601
Serum concentrations of CRB-601 expressed as Area under the curve (AUC)
Time frame: 28 Days
To characterize the PK profile of CRB-601
Serum concentrations of CRB-601 expressed as Concentration max (Cmax)
Time frame: 28 Days
Plan to share: No
No publications or documents are linked to this record.
Started Dec 2024 (actual). Primary completion is estimated for Nov 2026, 22 months after the start.
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Corbus Pharmaceuticals Inc.