A Study to Evaluate the Safety and Efficacy of SCTB35 in Combination With Gemcitabine and Oxaliplatin in Patients With Relapsed or Refractory Diffuse Large B-Cell Lymphoma

August 11, 2026 updated by: Sinocelltech Ltd.

A Phase 3 Randomized, Open-label, Multicenter Study to Evaluate the Safety and Efficacy of SCTB35 in Combination With Gemcitabine and Oxaliplatin Versus Rituximab in Combination With Gemcitabine and Oxaliplatin in Patients With Relapsed or Refractory Diffuse Large B-Cell Lymphoma

The purpose of this study is to evaluate the efficacy and safety of SCTB35 in Combination With Gemcitabine and Oxaliplatin vs Rituximab in Combination With Gemcitabine and Oxaliplatin in Patients With Relapsed or Refractory Diffuse Large B-Cell Lymphoma.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
101

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • China
      • Beijing, China, 100142
        • Recruiting
        • Beijing Cancer Hospital
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Age 18-80 years old
  • Histologically confirmed diffuse large B-cell lymphoma according to WHO 2022 criteria
  • Relapsed or refractory (R/R) disease following at least one prior systemic regimen that contained an anti-CD20 monoclonal antibody (mAb) in combination with chemotherapy
  • Participants who have failed after one prior line of therapy are not candidates for high-dose chemotherapy followed by autologous stem cell transplant (ASCT)
  • Presence of measurable or evaluable disease at baseline ECOG PS 0-2
  • ECOG PS 0-2
  • Adequate organ function and bone marrow function
  • Expected survival ≥ 3 months

Exclusion Criteria:

  • Prior treatment with antibodies targeting both CD20 and CD3
  • Contraindication to rituximab, gemcitabine or oxaliplatin, or prior treatment with an anti-CD20 antibody in combination with the GemOx regimen
  • Peripheral neuropathy assessed to be Grade >1 according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) v6.0 at enrollment
  • Known central nervous system (CNS) involvement by lymphoma
  • Known any major episode of active infection requiring treatment with systemic antibiotics within 2 weeks
  • Treatment with chimeric antigen receptor T-cell (CAR-T) therapy within 100 days prior to first SCTB35 administration
  • Autologous HSCT within 100 days prior to first SCTB35 administration, or any prior allogeneic HSCT or solid organ transplantation
  • Major surgery within 4 weeks prior to first SCTB35 administration
  • Chemotherapy and other non-investigational antineoplastic agents (except CD20 mAbs) within 4 weeks or 5 half-lives (whichever is shorter) prior to first SCTB35 administration
  • Administration of a live, attenuated vaccine within 4 weeks before first study treatment administration or anticipation that such a live, attenuated vaccine will be required during the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: R-GemOx
Drug: Rituxumab
Participants will receive IV rituxumab on Day 1 of each cycle for up to 8 cycles.
Drug: Gemcitabine
Participants will receive IV gemcitabine administration for up to 8 cycles.
Drug: Oxaliplatin
Participants will receive IV oxaliplatin administration for up to 8 cycles.
Experimental: SCTB35-GemOx
Drug: SCTB35 injection
SCTB35 will be subcutaneously administered at a dose as specified
Drug: Gemcitabine
Participants will receive IV gemcitabine administration for up to 8 cycles.
Drug: Oxaliplatin
Participants will receive IV oxaliplatin administration for up to 8 cycles.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Adverse Events
Time Frame: Up to approximately 3 years
Treatment-emergent adverse events/serious adverse events/adverse events of special interest
Up to approximately 3 years
Progression free survival (PFS)
Time Frame: Up to approximately 3 years
Defined as the time from the date of randomization to the date of first documentation of progression disease (PD) or the date of death from any cause, whichever occurs first.
Up to approximately 3 years

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Percentage of Participants Achieving Best Overall Response (BOR)
Time Frame: Up to approximately 3 years
BOR is defined as Complete Response (CR) or Partial Response (PR), determined by Lugano criteria
Up to approximately 3 years
Percentage of Participants Achieving CR
Time Frame: Up to approximately 3 years
Percentage of participants who achieve a CR determined per Lugano criteria.
Up to approximately 3 years
Overall Survival (OS)
Time Frame: Up to approximately 3 years
Overall survival is defined as the duration from the date of randomization to the date of the participant's death.
Up to approximately 3 years
Duration of Response (DOR)
Time Frame: Up to approximately 3 years
DOR is defined as the time from the first occurrence of response (CR or PR) to disease progression or death, whichever occurs first.
Up to approximately 3 years
Time to Response (TTR)
Time Frame: Up to approximately 3 years
Time to response is defined for participants achieving a CR/PR as the time from starting therapy to first a CR/PR.
Up to approximately 3 years
Event-Free Survival (EFS)
Time Frame: Up to approximately 3 years
EFS is defined as the duration from randomization to disease progression determined by Lugano criteria as assessed by the investigator, initiation of any non-protocol-specified new anti-lymphoma therapy for any reason, or death (whichever occurs first).
Up to approximately 3 years
Duration of Complete Response (DOCR)
Time Frame: Up to approximately 3 years
DOCR is defined as the time from the first occurrence of CR to disease progression or death, whichever occurs first.
Up to approximately 3 years
Time to Complete Response (TTCR)
Time Frame: Up to approximately 3 years
Time to complete response is defined for participants achieving a CR as the time from starting therapy to first a CR.
Up to approximately 3 years
Blood Concentrations of SCTB35
Time Frame: Up to approximately 1 years
The pharmacokinetics of SCTB35 will be analyzed based on the drug concentrations at respective timepoints in the blood samples (or blood derivative)
Up to approximately 1 years
Anti-drug Antibodies of SCTB35
Time Frame: Up to approximately 3 years
Blood samples (or blood derivative) will be screened for antibodies binding to SCTB35
Up to approximately 3 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Sinocelltech Ltd.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 4, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
April 1, 2029

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 29, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 29, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 6, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 13, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 11, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • SCTB35-B301

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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