A Safety, Efficacy and Pharmacokinetic Study of BTCT4465A (Mosunetuzumab) as a Single Agent and Combined With Atezolizumab in Non-Hodgkin's Lymphoma (NHL) and Chronic Lymphocytic Leukemia (CLL)

September 9, 2025 updated by: Genentech, Inc.

An Open-Label, Multicenter, Phase I/II Trial Evaluating the Safety, Efficacy, and Pharmacokinetics of Escalating Doses of Mosunetuzumab (BTCT4465A) as a Single Agent and Combined With Atezolizumab in Patients With Relapsed or Refractory B-Cell Non-Hodgkin's Lymphoma and Chronic Lymphocytic Leukemia

This is a Phase 1/2 dose-escalation study of BTCT4465A (Mosunetuzumab) administered as a single agent and in combination with atezolizumab in participants with relapsed or refractory B-cell NHL and CLL. The study will consist of a dose-escalation stage and an expansion stage where participants will be enrolled into indication-specific cohorts.

Study Overview

Status

Status

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

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 (Actual)

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.
713

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 2
  • Phase 1

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Australia
    • New South Wales
      • Darlinghurst, New South Wales, Australia, 2010
        • St Vincent's Hospital Sydney
    • Queensland
      • South Brisbane, Queensland, Australia, 4101
        • Icon Cancer Care South Brisbane
      • Woolloongabba, Queensland, Australia, 4102
        • Princess Alexandra Hospital
    • South Australia
      • Adelaide, South Australia, Australia, 5000
        • Royal Adelaide Hospital
      • Fitzroy, South Australia, Australia, 3065
        • St. Vincent's Hospital Melbourne
    • Tasmania
      • Hobart, Tasmania, Australia, 7000
        • Royal Hobart Hospital
    • Victoria
      • Clayton, Victoria, Australia, 3168
        • Monash Health Clinical Trial Pharmacy department
    • Western Australia
      • Nedlands, Western Australia, Australia, 6009
        • The Perth Blood Institute
  • Canada
    • Ontario
      • Toronto, Ontario, Canada, M5G 2M9
        • Princess Margaret Hospital
    • Quebec
      • Montreal, Quebec, Canada, H3T 1E2
        • Jewish General Hospital
  • Germany
      • Cologne, Germany, 50931
        • Universitatsklinikum Koln
      • Heidelberg, Germany, 69120
        • UniversitatsKlinikum Heidelberg
      • Mainz, Germany, 55101
        • Universitaetsmedizin der Johannes Gutenberg-Universitaet Mainz
      • München, Germany, 83177
        • Klinikum der Universität München, Campus Großhadern
  • South Korea
      • Seoul, South Korea, 03080
        • Seoul National University Hospital
      • Seoul, South Korea, 06351
        • Samsung Medical Center
  • Spain
      • Barcelona, Spain, 08035
        • Hospital Universitario Vall D hebron
      • Madrid, Spain, 280146
        • Hospital Universitario La Paz
      • Salamanca, Spain, 37007
        • Complejo Asistencial Universitario de Salamanca
    • Navarre
      • Pamplona, Navarre, Spain, 31008
        • Clinica Universidad de Navarra
  • United Kingdom
      • London, United Kingdom, EC1A 7BE
        • Barts Cancer Institute
      • Manchester, United Kingdom, M20 4BX
        • The Christie Nhs Foundation Trust
      • Sutton, United Kingdom, SM2 5PT
        • Royal Marsden Hospital;Institute of Cancer Research
  • United States
    • California
      • La Jolla, California, United States, 92093-0698
        • University of California San Diego Moores Cancer Center
      • Santa Barbara, California, United States, 93105
        • Sansum Medical Clinic, Inc.
    • Colorado
      • Denver, Colorado, United States, 80218
        • Rocky Mountain Cancer Center
    • Connecticut
      • New Haven, Connecticut, United States, 06510
        • Yale University School Of Medicine
    • New Jersey
      • Hackensack, New Jersey, United States, 07601
        • Hackensack University Medical Center
      • Montvale, New Jersey, United States, 07645
        • Memorial Sloan Kettering Bergen
    • New York
      • Commack, New York, United States, 11725
        • Memorial Sloan Kettering Cancer Center - Commack
      • Harrison, New York, United States, 10604
        • Memorial Sloan Kettering Cancer Center at Westchester
      • New York, New York, United States, 10016
        • New York Uni Medical Center
    • Oregon
      • Springfield, Oregon, United States, 97477
        • Willamette Valley Cancer Insitute and Research Center
    • Pennsylvania
      • Philadelphia, Pennsylvania, United States, 19103
        • University of Pennsylvania
    • Texas
      • Houston, Texas, United States, 77030
        • MD Anderson Cancer Center

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Key Inclusion Criteria:

  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
  • B-cell hematologic malignancies expected to express the cluster of differentiation 20 (CD20) antigen who have relapsed after or failed to respond to at least one prior treatment regimen and for whom there is no available therapy expected to improve survival
  • Adequate hepatic, hematologic, and renal function

Key Exclusion Criteria:

  • Pregnant or lactating women
  • Monoclonal antibody, radioimmunoconjugate, antibody-drug conjugate, chemotherapy, or other investigational anti-cancer agent within 4 weeks prior to study drug
  • Treatment with radiotherapy within 2 weeks prior to the first BTCT4465A (Mosunetuzumab) administration
  • Systemic immunosuppressive medication within 2 weeks prior to study drug
  • Autologous stem cell transplantation (SCT) within 100 days prior to study drug, or any prior allogeneic SCT or solid organ transplantation
  • Autoimmune disease with the exception of controlled/treated hypothyroidism, disease-related immune thrombocytopenic purpura, or hemolytic anemia
  • History of central nervous system (CNS) lymphoma or other CNS disease
  • Significant cardiovascular or pulmonary disease
  • Hepatitis B or C or human immunodeficiency virus (HIV)
  • Receipt of a live attenuated vaccine within 4 weeks prior to study drug
  • Prior treatment with chimeric antigen receptor T-cell (CAR-T) therapy within 30 days before first BTCT4465A (Mosunetuzumab) administration

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: Non-Randomized
  • Interventional Model: Sequential 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.
Experimental: Dose Escalation
Participants will receive BTCT4465A (Mosunetuzumab) via intravenous (IV) infusion or subcutaneous (SC) injection as a single-agent or in combination with atezolizumab. Dose escalation will be guided by the observed incidence of DLTs at each dose level.
Drug: BTCT4465A (Mosunetuzumab) IV
Participants with B-cell NHL and CLL will receive BTCT4465A (Mosunetuzumab) via IV infusion.
Drug: Atezolizumab
Participants assigned to an atezolizumab combination group will receive atezolizumab 1200 mg administered as an IV infusion in combination with BTCT4465A (Mosunetuzumab).
Other Names:
  • Tecentriq
Drug: BTCT4465A (Mosunetuzumab) SC
Participants with B-cell NHL and CLL will receive BTCT4465A (Mosunetuzumab) via SC injection.
Experimental: Dose Expansion
Participants will receive BTCT4465A (Mosunetuzumab) as a single-agent or in combination with atezolizumab.
Drug: BTCT4465A (Mosunetuzumab) IV
Participants with B-cell NHL and CLL will receive BTCT4465A (Mosunetuzumab) via IV infusion.
Drug: Atezolizumab
Participants assigned to an atezolizumab combination group will receive atezolizumab 1200 mg administered as an IV infusion in combination with BTCT4465A (Mosunetuzumab).
Other Names:
  • Tecentriq
Drug: BTCT4465A (Mosunetuzumab) SC
Participants with B-cell NHL and CLL will receive BTCT4465A (Mosunetuzumab) via SC injection.

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
Time Frame
Maximum Tolerated Dose (MTD) of BTCT4465A (Mosunetuzumab)
Time Frame: BTCT4465A (Mosunetuzumab) single agent: Cycle 1; BTCT4465A (Mosunetuzumab) in combination with atezolizumab: during the first cycle that BTCT4465A (Mosunetuzumab) and atezolizumab are administered concurrently (cycle length = 21 days)
BTCT4465A (Mosunetuzumab) single agent: Cycle 1; BTCT4465A (Mosunetuzumab) in combination with atezolizumab: during the first cycle that BTCT4465A (Mosunetuzumab) and atezolizumab are administered concurrently (cycle length = 21 days)
Percentage of Participants With Adverse Events
Time Frame: Cycle 1 Day 1 until 90 days after the last infusion (cycle length = 21 days; up to approximately 14 months)
Cycle 1 Day 1 until 90 days after the last infusion (cycle length = 21 days; up to approximately 14 months)
BTCT4465A (Mosunetuzumab) Serum Concentration
Time Frame: Baseline up to 30 days after the last infusion of BTCT4465A (Mosunetuzumab) (up to approximately 12 months)
Baseline up to 30 days after the last infusion of BTCT4465A (Mosunetuzumab) (up to approximately 12 months)
Atezolizumab Serum Concentration
Time Frame: Baseline up to 30 days after the last infusion of BTCT4465A (Mosunetuzumab) (up to approximately 12 months)
Baseline up to 30 days after the last infusion of BTCT4465A (Mosunetuzumab) (up to approximately 12 months)
Percentage of Participants with Complete Response as Assessed Using Standard Criteria for NHL
Time Frame: Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, or withdrawal)
Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, or withdrawal)

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
Duration of Response as Assessed Using Standard Criteria for NHL
Time Frame: Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, or withdrawal)
Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, or withdrawal)
Progression-Free Survival (PFS) as Assessed Using Standard Criteria for NHL
Time Frame: Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, withdrawal, or death from any cause)
Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, withdrawal, or death from any cause)
Overall Survival
Time Frame: Baseline until death from any cause (up to approximately 4 years)
Baseline until death from any cause (up to approximately 4 years)
European Organisation for Research and Treatment of Cancer Quality-of-Life Questionnaire Core 30 (EORTC QLQ-C30) Scores to Assess Health-Related Quality of Life (HRQoL)
Time Frame: Baseline until disease progression, start of new anti-cancer therapy, or withdrawal (up to approximately 4 years).
The Functional Assessment of Cancer Therapy-Lymphoma (FACT-lym) Subscale, and the EuroQol 5 Dimension-5 Level (EQ-5D-5L) Questionnaire scores will also be used to assess HRQoL
Baseline until disease progression, start of new anti-cancer therapy, or withdrawal (up to approximately 4 years).
Objective Response Rate (ORR)
Time Frame: Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, or withdrawal)
Baseline up to approximately 4 years (assessed at screening and then every 3 months until disease progression, start of new anti-cancer therapy, or withdrawal)

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.
Genentech, Inc.

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Clinical Trials, Hoffmann-La Roche

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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.
September 15, 2015

Primary Completion (Actual)

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.
May 21, 2024

Study Completion (Actual)

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.
September 1, 2025

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).
July 14, 2015

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.
July 14, 2015

First Posted (Estimated)

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.
July 16, 2015

Study Record Updates

Last Update Posted (Estimated)

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.
September 12, 2025

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.
September 9, 2025

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.
September 1, 2025

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.
  • GO29781

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

For eligible studies, qualified researchers may request access to individual patient level clinical data. See Roche's commitment to transparency of clinical study information here: https://go.roche.com/data_sharing.

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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