Recruiting
Phase 2

Zanubrutinib, Bendamustine, Rituximab

Sponsor:

Massachusetts General Hospital

Code:

NCT06561347

Conditions

Waldenstrom Macroglobulinemia

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Interventions

Zanubrutinib

Bendamustine

Rituximab

Study Details

Brief summary:

The purpose of this study is to determine the very good partial response (VGPR) or better rate in participants with Waldenström macroglobulinemia (WM).

The names of the study drugs involved in this study are as follows: zanubrutinib, bendamustine, and rituximab.

Conditions

Waldenstrom Macroglobulinemia

Study ID

NCT06561347

Start date

Dec 20, 2024

Status verified date

Aug, 2026

Completion date

Dec 1, 2027

Anticipated

Primary completion date

Dec 1, 2026

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Inclusion Criteria:

  • Clinicopathological diagnosis of waldenström macroglobulinemia (WM) per the second international workshop on waldenström macroglobulinemia (IWWM2) criteria
  • Presence of any MYD88 and CXCR4 mutation status, including MYD88 L265P mutation plus CXCR4 wild type, MYD88 L265P mutation plus CXCR4 mutation, or MYD88 wild type
  • Meeting criteria for treatment per IWWM2 criteria. At least one of the following:

  • Constitutional Symptoms (at least one of the following)

  • Recurrent fever
  • Night sweats
  • Fatigue
  • Weight loss
  • Progressive or symptomatic lymphadenopathy or splenomegaly
  • Hemoglobin ≤ 10 g/dL
  • Platelet count ≤ 100 k/uL
  • Hyperviscosity syndrome
  • Symptomatic peripheral neuropathy
  • Systemic amyloidosis
  • Renal insufficiency
  • Symptomatic cryoglobulinemia or cold agglutinemia
  • Treatment naive; must have not received any prior systemic therapy for WM
  • Participants with suspected or symptomatic hyperviscosity (e.g. nosebleeds, headaches, blurred vision) must undergo plasmapheresis prior to treatment initiation.
  • Adults age ≥18
  • ECOG performance status ≤2 (Karnofsky ≥60%, see Appendix A)
  • Women of childbearing potential: Females of childbearing potential (FCBP) must agree to use two reliable forms of contraception simultaneously or practice complete abstinence1 from heterosexual intercourse during treatment and for at least 1 week after the last dose of zanubrutinib or at least 12 months after the last dose of rituximab, whichever is later. FCBP must be referred to a qualified provider of contraceptive methods if needed. Also, FCBP must have a pregnancy check with a negative serum pregnancy test obtained 28 days prior to and confirmed by C1D1.
  • Men must agree to use a condom during sexual contact with a female of childbearing potential (FCBP) even if they have had a successful vasectomy 1) while participating in the study; and 2) for at least 1 week following the last dose of zanubrutinib.
  • Participants must meet the following organ and marrow function as defined below:

  • Absolute neutrophil count ≥500/mcL believed to be caused by WM bone marrow involvement. Growth factors are not permitted <14 days prior to C1D1.
  • Platelets ≥30,000/mcL believed to be caused by WM bone marrow involvement. Platelet transfusions are not permitted <14 days prior to C1D1.
  • Hemoglobin ≥ 7 g/dL. RBC transfusions are not permitted <14 days prior to C1D1.
  • Total bilirubin ≤ 1.5 X institutional ULN, or ≤3 x institutional ULN with documented liver metastases and/or Gilbert's Disease
  • AST(SGOT)/ALT(SGPT) ≤2.5 × institutional upper limit of normal, or ≤5 X institutional ULN with documented liver metastases
  • Creatinine clearance ≥30 mL/min using the Cockcroft-Gault formula
  • Able to adhere to the study visit schedule and other protocol requirements.
  • Ability to understand and the willingness to sign a written informed consent document.

Exclusion Criteria:

  • Any serious medical condition, laboratory abnormality, uncontrolled intercurrent illness, or psychiatric illness/social condition that would prevent the participant from signing the informed consent form
  • Female participants who are pregnant, breastfeeding, or planning to become pregnant or breastfeed while enrolled in this study
  • Participants with known CNS involvement by WM
  • Participants with known history of Human Immunodeficiency Virus (HIV)
  • Known active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection based on criteria below:

  • Hepatitis B virus (HBV): Patients with positive hepatitis B surface antigen (HBsAg) are excluded. Patients with positive hepatitis B core antibody (antiHBc) and negative HBsAg require hepatitis B polymerase chain reaction (PCR) evaluation before enrollment. Patients who are hepatitis B PCR positive will be excluded.
  • Hepatitis C virus (HCV): positive hepatitis C antibody. If positive hepatitis C antibody result, patient will need to have a negative result for hepatitis C ribonucleic acid (RNA) before enrollment. Patients who are hepatitis C RNA positive will be excluded.
  • Concurrent systemic immunosuppressant therapy. Systemic steroids at doses <20mg prednisone per day are permitted.
  • Active and/or ongoing autoimmune anemia and/or autoimmune thrombocytopenia (eg, idiopathic thrombocytopenia purpura).
  • Concurrent administration of warfarin or warfarin derivatives.
  • Vaccinated with live, attenuated vaccines within 4 weeks of first dose of study drug.
  • Active uncontrolled systemic bacterial, viral, fungal or parasitic infection (except for fungal nail infection), or other clinically significant active disease process which in the opinion of the Investigator and the Sponsor makes it undesirable for the patient to participate in the trial. Screening for chronic conditions is not required. Active uncontrolled systemic bacterial, viral, fungal or parasitic infection (except for fungal nail infection), or other clinically significant active disease process which in the opinion of the Investigator and the Sponsor makes it undesirable for the patient to participate in the trial. Screening for chronic conditions is not required.
  • Major surgery within 4 weeks of first dose of study drug.
  • History of severe bleeding disorder such as hemophilia A, hemophilia B, or history of spontaneous bleeding requiring blood transfusion or other medical intervention. History of stroke or intracranial hemorrhage within 6 months before first dose of study drug.
  • Participants with inability to swallow pills.
  • Inability to comply with outpatient treatment, laboratory monitoring, and required clinic visits for the duration of the study participation.
  • Any uncontrolled or significant cardiovascular disease defined as:

  • Unstable angina within 3 months before screening, or
  • History of myocardial infarction within 6 months prior to planned start of zanubrutinib, or
  • Previously documented left ventricular ejection fraction (LVEF) by any method of ≤ 45% in the 12 months prior to planned start of zanubrutinib; assessment of LVEF via echocardiogram or multigated acquisition (MUGA) scan during Screening should be performed in selected patients as medically indicated, or
  • Any Class 3 or 4 cardiac disease as defined by the New York Heart Association Functional Classification, or
  • Uncontrolled or symptomatic arrhythmias (eg, sustained ventricular tachycardia, ventricular fibrillation, torsades de pointes)
  • Participants with a known hypersensitivity to any of the excipients of Zanubrutinib, Rituximab, or Bendamustine.
  • Participants with a history of non-compliance to medical regimens, which will render the administration of study drug hazardous or obscure the interpretation of toxicity or AEs.
  • Prior malignancy within the past 3 years, except for curatively treated basal or squamous cell skin cancer, non-muscle-invasive bladder cancer, carcinoma in situ of the cervix or breast, or localized Gleason score 6 prostate cancers.
  • Severe or debilitating pulmonary disease.
  • Ongoing alcohol or drug addiction or any psychiatric condition(s) which would compromise ability to comply with study procedures.
  • Ongoing use of a strong CYP3A inducer.

Study Design

Enrollment

65 participants

Anticipated

Intervention Model

Single group

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

experimental: Zanubrutinib + Bendamustine + Rituximab

Zanubrutinib will be taken orally once daily on days 1-28 of cycles 1-15.

Bendamustine will be given by intravenous infusion over about 10 to 60 minutes on days 1 and 2 of cycles 1 to 4.

Rituximab will be given by intravenous infusion over about 30 minutes on day 1 of cycles 1 to 4.

Drug diaries will be provided to participants to document information about the study treatment being taken.

Interventions

Zanubrutinib

A potent, specific, and irreversible Bruton tyrosine kinase (BTK) inhibitor

Bendamustine

Alkylating agent

Rituximab

Monoclonal antibody

Primary outcome measure

  • Very Good Partial Response (VGPR) or Better Response Rate [ Time Frame: Day 1 to 5 years post treatment ]

Central Contacts and Locations

Central contacts

Andrew Branagan, MD, PhD

617-724-4000abranagan@mgh.harvard.edu

Locations

Colorado Blood Cancer Institute (CBCI)

Recruiting

Denver, Colorado, United States, 80218

Contacts

Jeffrey V. Matous, MD

720-754-4800Jeffrey.Matous@HealthONECares.com

Massachusetts General Hospital

Recruiting

Boston, Massachusetts, United States, 02114

Contacts

Andrew Branagan, MD, PhD

617-724-4000abranagan@mgh.harvard.edu

Beth Israel Deaconess Medical Center

Recruiting

Boston, Massachusetts, United States, 02215

Contacts

Gottfried Von Keudell, MD

617-667-7000

Dana Farber Cancer Institute

Recruiting

Boston, Massachusetts, United States, 02215

Contacts

Shayna Sarosiek, MD

617-632-3000Shayna_Sarosiek@DFCI.HARVARD.EDU

University of Texas Southwestern Medical Center

Recruiting

Dallas, Texas, United States, 75390

Contacts

Larry D Anderson, MD, PhD

214-648-4155Larry.anderson@utsouthwestern.edu

More Information

Sponsor

Massachusetts General Hospital

Last update posted

Sep 1, 2026

Last verified

Aug, 2026

Keywords

  • MW
  • Untreated

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-08. This information was provided to ClinicalTrials.gov by Massachusetts General Hospital on 2026-09-01.