A Phase 2, Multicenter, Open-Label Trial to Evaluate Efficacy and Safety of Subcutaneous (SC) Mosunetuzumab in Previously Untreated Low Tumor Burden Follicular Lymphoma (LTB-FL).

NCT ID: NCT07191249

Last Updated: 2025-09-24

Basic Information

• Recruitment Status: NOT_YET_RECRUITING
• Clinical Phase: PHASE2
• Total Enrollment: 30 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-10-10
• Study Completion Date: 2029-03-01

Brief Summary

This is a multi-center, open-label, interventional clinical trial designed to evaluate the efficacy and safety of subcutaneous (SC) Mosunetuzumab as a first-line immunotherapy in patients with low tumor burden follicular lymphoma (LTB-FL), defined by the absence of GELF criteria.

Eligible patients will undergo screening and, upon signing an Informed Consent Form, will receive their first dose of SC Mosunetuzumab.

Mosunetuzumab is administered via SC injection without the need for mandatory hospitalization. The first cycle lasts 21 days, followed by subsequent 28-day cycles. In Cycle 1, Mosunetuzumab is given on Day 1 (5 mg), Day 8 (45 mg), and Day 15 (45 mg). From Cycle 2 onward, a single 45 mg dose is administered on Day 1 of each cycle. Treatment continues for up to 8 cycles (approximately 6 months).

Patients will be monitored for disease status according to standard clinical practice. After completing active treatment, they will enter a post-treatment follow-up phase. Premedication with dexamethasone (20 mg) is mandatory in Cycle 1 and optional in later cycles. Acetaminophen and diphenhydramine may also be administered.

All patients will continue study treatment as per the Schedule of Activities or until premature discontinuation. After treatment discontinuation, disease status assessments will occur approximately every 3 months for up to 24 months. During post-treatment follow-up, PET-CT scans for disease evaluation will be performed every 6 months, as applicable. Patients not under active follow-up will be contacted annually to collect data on disease status and survival.

Throughout the trial, the following data will be collected (as applicable): demographics and baseline characteristics (including sex, age, race, height, and weight), medical history, details of initial diagnosis and treatment history, concomitant medications, adverse events (AEs), serious adverse events (SAEs), disease response, and survival status.

Conditions

Follicular Lymphoma

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Patients with follicular lymphoma with low tumor burden who have not been previously treated

In this study, Mosunetuzumab will be administered subcutaneously over 8 treatment cycles: 5 mg on Day 1 of Cycle 1, followed by 45 mg in all subsequent cycles.

Group Type: EXPERIMENTAL

Mosunetuzumab is a bispecific monoclonal antibody targeting CD20 on B cells and CD3 on T cells, redirecting T cells to eliminate malignant B cells.

Intervention Type: DRUG

In this study, Mosunetuzumab will be administered subcutaneously over 8 treatment cycles: 5 mg on Day 1 of Cycle 1, followed by 45 mg in all subsequent cycles.

Interventions

Mosunetuzumab is a bispecific monoclonal antibody targeting CD20 on B cells and CD3 on T cells, redirecting T cells to eliminate malignant B cells.

In this study, Mosunetuzumab will be administered subcutaneously over 8 treatment cycles: 5 mg on Day 1 of Cycle 1, followed by 45 mg in all subsequent cycles.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• at least 18 years old
• Histologically confirmed classic FL (cFL) (according to WHO-HEAM4R classification)
• Low tumor burden by GELF criteria
• No prior therapy except surgery or radiotherapy for disease that was previously localized
• Ann Arbor Stage III or IV disease
• Bi-dimensionally measurable FDG-avid disease defined by at least one single node or tumor lesion > 1.5 cm assessed by CT scan and/or clinical examination
• Adequate hematologic function defined as follows without growth factors or blood product transfusion within 14 days of first dose of study drug administration:

1. Hemoglobin, without transfusion, 9 g/dL

2. ANC 1.0 109/L

3. Platelet count 75 109/L;

• Eastern Cooperative Oncology Group (ECOG) performance status 0 to 2
• Patient can understand and sign the Informed Consent Form (ICF), can communicate with the Investigator, can understand and comply with the requirements of the protocol

Exclusion Criteria

• 1. An active viral infection with hepatitis B virus (HBV) or hepatitis C virus (HCV) defined by detectable viral DNA in the blood by PCR. Patients with HIV are eligible provided an undetectable viral load and a CD4 count > 200 cell/mcl
• 2. Any of the following laboratory abnormalities:

1. Total Bilirubin or GGT or AST or ALT > 3 X ULN.

2. Creatinine Clearance calculated by Cockcroft and Gault Formula < 40 ml/min

• Presence or history of CNS involvement by lymphoma
• 4. Prior history of malignancies other than Lymphoma (except for Basal Cell or Squamous Cell Carcinoma of the skin or carcinoma in situ of the cervix or breast) unless the subject has been free of the disease for ≥ 2 years
• Contraindication to use Mosunetuzumabor known sensitivity or allergy
• Pregnant or lactating females
• 7. Female patients of childbearing potential who cannot or do not wish to use an effective method of contraception, during the study treatment and for 3 months thereafter

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Hoffmann-La Roche

INDUSTRY

Sponsor Role: collaborator

Tel-Aviv Sourasky Medical Center

OTHER_GOV

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Irit Avivi, MD

Role: PRINCIPAL_INVESTIGATOR

Tel-Aviv Sourasky Medical Center

Central Contacts

Irit Avivi, MD

Role: CONTACT

iritavi@tlvmc.gov.il

+972 3-6974452

Irit Segalovich, B.Sc

Role: CONTACT

iritseg@tlvmc.gov.il

+972 3-6947824

Other Identifiers

0691-24-TLV

Identifier Type: -

Identifier Source: org_study_id