ClinicalTrials.gov record NCT07420959

ABBV-383 for the Treatment of Relapsed Refractory Waldenström Macroglobulinemia

Record copied from ClinicalTrials.gov: Oct 10, 2026AI summaries generated: Sep 17, 2026

Phase 1/2 Trial of ABBV-383 for Patients With Relapsed Refractory Waldenström Macroglobulinemia

StatusRecruitingThe study is currently enrolling participants. Only the study team can say whether a particular person can join.
Study typeInterventionalA study in which researchers assign participants to one or more interventions, such as a drug, procedure, device, behavioural programme or other approach, to measure their effects.
PhasePhase 1/2A study that combines safety and dose-finding (phase 1) with a first look at whether the treatment has an effect (phase 2).
Age18 years old and older
SexAll
LocationUnited States
AI summaryWhat this study is about, in plain languageShow ▾Hide ▴

AI-written from the registry record, not the study's own wording. May contain errors or omissions. Check the registry text on this page and the original record ↗ before acting on it.

This Phase 1/2 interventional trial gives intravenous ABBV-383 to adults with relapsed or refractory Waldenström macroglobulinemia to find the best dose and study side effects and responses. Treatment is given on 28-day cycles (days 1 and 4 of cycle 1, then day 1 of later cycles) and may continue for up to 12 cycles unless disease progresses or toxicity prevents further treatment. Participants will have blood and urine samples, bone marrow aspiration/biopsy, CT or PET/CT scans if indicated, and questionnaires during the study.

What it is studying. The study seeks to determine the maximum tolerated dose and tolerability of ABBV-383 (Phase 1) and to measure how often participants reach a very good partial response (VGPR) or better and other response outcomes (Phase 2). It also collects data on major response rates, progression-free survival, time to response, duration of response, time to next treatment, overall survival, and the incidence and severity of adverse events including immune-related toxicities.

What the researchers hope to learn. Scientific goals: identify the maximum tolerated dose of ABBV-383; estimate the proportion of patients achieving very good partial response or better; measure major response rate, progression-free survival, time to response, duration of response, time to next treatment, overall survival, and characterize adverse events including cytokine release syndrome and neurotoxicity.

What this study is about

The study's own summary, as published on ClinicalTrials.gov. Underlined terms have a short explanation.

This phase I/II trial studies the side effects and best dose of ABBV-383 and to see how well it works in treating patients with Waldenström macroglobulinemia that has come back after a period of improvement (relapsed) or that does not respond to treatment (refractory). ABBV-383 is a monoclonal antibody that may interfere with the ability of cancer cells to grow and spread. A monoclonal antibody is a type of protein that can bind to certain targets in the body, such as molecules that cause the body to make an immune response (antigens).

Interventions being studied

Being studied in this trial does not mean the treatment or procedure is approved or available for this condition.

Biological
  • Etentamig
Procedure
  • Biospecimen Collection
  • Bone Marrow Aspiration
  • Bone Marrow Biopsy
  • Computed Tomography
  • Positron Emission Tomography
Other
  • Questionnaire Administration

Eligibility

The criteria exactly as listed on ClinicalTrials.gov. Only the study team can say whether they apply to you.

Inclusion criteria

  • PRE-REGISTRATION: Age ≥ 18 years
  • PRE-REGISTRATION: Histological confirmation of relapsed and/or refractory Waldenstrom macroglobulinemia, with known prior exposure to a Bruton tyrosine kinase (BTK) inhibitor unless medically contraindicated. Note: although not preferred, archival bone marrow tumor tissue that was collected within 12 weeks prior to screening and without intervening anti- BCMA treatment may be used if the patient is unwilling to provide a fresh pretreatment marrow biopsy
  • PRE-REGISTRATION: Measurable disease as defined as serum immunoglobulin M (IgM) levels ≥ 0.5 g/dL (500 mg/dL)
  • PRE-REGISTRATION: Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0, 1 or 2
  • PRE-REGISTRATION: Subject is naïve to treatment with ABBV-383 or anti-BCMA bispecific antibodies
  • PRE-REGISTRATION: Hemoglobin ≥ 8.0 g/dL (obtained ≤ 14 days prior to pre-registration)
  • PRE-REGISTRATION: Absolute neutrophil count (ANC) ≥ 1000/mm\^3 [neutropenia due to marrow infiltration may be supported by granulocyte colony-stimulating factor (GCSF)] (obtained ≤ 14 days prior to pre-registration). Transfusion and/or growth factor support is permitted prior to assessment, but neutrophils, platelets, and hemoglobin must be stable for ≥ 72 hours after transfusion and/or growth factor administration for the subject to be eligible
  • PRE-REGISTRATION: Platelet count ≥ 75,000/mm\^3 (obtained ≤ 14 days prior to pre-registration) EXCEPTION: If thrombocytopenia deemed to be related to the bone marrow infiltration (disease burden) by WM cells, platelet count threshold of ≥ 50,000 is acceptable. Transfusion and/or growth factor support is permitted prior to assessment, but neutrophils, platelets, and hemoglobin must be stable for ≥ 72 hours after transfusion and/or growth factor administration for the subject to be eligible
  • PRE-REGISTRATION: Total bilirubin ≤ 1.5 x upper limit of normal (ULN) (obtained ≤ 14 days prior to pre-registration) (except for subjects with documented Gilbert's syndrome, in which case direct bilirubin must be ≤ 2 x ULN)
  • PRE-REGISTRATION: Alanine aminotransferase (ALT) and aspartate transaminase (AST) ≤ 3 x ULN (obtained ≤ 14 days prior to pre-registration)
  • PRE-REGISTRATION: Prothrombin time (PT)/international normalized ratio (INR)/activated partial thromboplastin time (aPTT) ≤ 1.5 x ULN OR if patient is receiving anticoagulant therapy and INR or aPTT is within target range of therapy (obtained ≤ 14 days prior to pre-registration)
  • PRE-REGISTRATION: Calculated creatinine clearance ≥ 30 ml/min using the Cockcroft-Gault formula (obtained ≤ 14 days prior to pre-registration)
  • PRE-REGISTRATION: Negative pregnancy test done ≤ 7 days prior to pre-registration, for persons of childbearing potential only. Note: Subjects must have 2 negative results for pregnancy tests prior to initiating therapy. The first test (serum) should be performed during the screening period prior to first dose of study drug and the second test (urine, minimum sensitivity of 25 IU/L). If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required
  • PRE-REGISTRATION: Willing to follow strict birth control measures as suggested by the study
  • PRE-REGISTRATION: Female participants: Female participant is eligible to participate if she is not pregnant or breast feeding, and at least one of the following conditions applies:
  • Is not a woman of childbearing potential (WOCBP) OR
  • Due to the risk for embryo-fetal toxicity and prescribed under a pregnancy prevention/controlled distribution program, WOCBP participants will be eligible if they commit to either:
  • Abstain continuously from heterosexual sexual intercourse as their preferred and usual lifestyle (abstinent on a long term and persistent basis) and agree to remain abstinent OR
  • To use birth control as follows:
  • Two methods of reliable birth control (one method that is highly effective and one additional effective (barrier) method), beginning 4 weeks prior to initiating treatment with lenalidomide, during therapy, during dose interruptions and continuing for 4 weeks following discontinuation of lenalidomide treatment
  • PRE-REGISTRATION: Male patients: Male participants are eligible to participate if they agree to the following from the time of first dose of study treatment until 28-days after the last dose of lenalidomide, to allow for clearance of any altered sperm:
  • Refrain from donating sperm PLUS either:
  • Be abstinent from heterosexual intercourse as their preferred and usual lifestyle (abstinent on a long term and persistent basis) and agree to remain abstinent. OR
  • Must agree to use contraception/barrier as detailed below:
  • Agree to use a male condom, even if they have undergone a successful vasectomy, and female partner to use an additional highly effective contraceptive method with a failure rate of < 1% per year as when having sexual intercourse with a woman of childbearing potential (including pregnant females)
  • Note: Subjects of childbearing potential must practice at least one of the specified method of birth control with partner(s) initiated prior to first dose of study drug administration to 90 days after the last dose of study drug. These methods include the following:
  • A barrier method of contraception (including male and female condoms with or without spermicide) plus one of the following hormonal contraceptives:
  • Combined (estrogen and progestogen containing) hormonal contraception associated with the inhibition of ovulation
  • Oral, intravaginal or transdermal
  • Progestogen-only hormonal contraception associated with the inhibition of ovulation
  • Oral, injectable, implantable
  • An intrauterine device (IUD)
  • Intrauterine hormone-releasing system (IUS)
  • Bilateral tubal occlusion
  • Vasectomized partner
  • Sexual abstinence (defined as refraining from heterosexual intercourse during the entire period of risk associated with the study treatment, starting the day prior to first dose of study drug, for the duration of the study, and for 90 days after the last dose of study drug). Total sexual abstinence should only be used as a contraceptive method if it is in line with the subjects' usual and preferred lifestyle. Periodic abstinence (e.g., calendar, ovulation, symptothermal, post-ovulation methods), declaration of abstinence for the duration of exposure to the investigational medicinal product (IMP), and withdrawal are not acceptable methods of contraception.
  • PRE-REGISTRATION: Provide written informed consent and is willing to comply with the tests required per the protocol
  • PRE-REGISTRATION: Willingness to provide mandatory blood and bone marrow samples specimens for correlative research
  • PRE-REGISTRATION: Rochester only: Willingness to enroll in Institutional Review Board (IRB) #521-93
  • REGISTRATION: Ability to complete questionnaire(s) by themselves or with assistance
  • REGISTRATION: Negative pregnancy test done ≤ 7 days prior to registration, for persons of childbearing potential only. Note: Subjects must have 2 negative results for pregnancy tests prior to initiating therapy. The first test (serum) should be performed during the screening period prior to first dose of study drug and the second test (urine, minimum sensitivity of 25 IU/L). If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required
  • REGISTRATION: Subject was pre-registered ≤ 14 days prior to registration

Exclusion criteria

  • PRE-REGISTRATION: Any of the following because this study involves an investigational agent whose genotoxic, mutagenic, and teratogenic effects on the developing fetus and newborn are unknown:
  • Pregnant persons
  • Nursing persons
  • Persons of childbearing potential (and persons able to father a child) who are unwilling to employ adequate contraception
  • PRE-REGISTRATION: Subject has known allergic reaction, significant sensitivity, or intolerance to constituents of the study drugs (and excipients) and/or other products in the same class
  • PRE-REGISTRATION: Any of the following prior therapies:
  • Major surgery ≤ 4 weeks prior to registration
  • Chemotherapy ≤ 2 weeks prior to registration
  • An investigational therapy, including chemotherapy, radiotherapy, biological, immunotherapy or targeted small molecule agents within 5 half-lives (or 2 weeks, if half-life is unknown) prior to registration
  • Patient has received steroid therapy given with anti-neoplastic intent ≤ 7 days prior registration
  • Autologous stem cell transplant ≤ 12 weeks or allogeneic transplant ≤ 24 weeks prior to registration
  • Organ transplant requiring continued use of immunosuppressants
  • Live, attenuated vaccines ≤ 4 weeks prior to registration
  • Received a monoclonal antibody given with anti-neoplastic intent ≤ 30 days prior to registration
  • PRE-REGISTRATION: Co-morbid systemic illnesses or other severe concurrent disease which, in the judgment of the investigator, would make the patient inappropriate for entry into this study or interfere significantly with the proper assessment of safety and toxicity of the prescribed regimens
  • PRE-REGISTRATION: Immunocompromised patients and patients with a known history of human immunodeficiency virus (HIV). Subjects with HIV may be permitted provided that the subject has an undetectable HIV viral load by standard clinical assays on antiretroviral medication [Highly Active Antiretroviral Therapy (HAART)] and is able to tolerate study treatment per investigator's judgement. Subjects with active, hepatitis C virus or active hepatitis B virus infection [subjects with resolved infection (hepatitis B virus surface antigen (HbsAg) negative, but hepatitis B virus core antibody (antiHBc) or hepatitis B virus surface antibody (antiHBs) positive] must be screened using real-time polymerase chain reaction (PCR) of hepatitis B virus (HBV) deoxyribonucleic acid (DNA).
  • PRE-REGISTRATION: Uncontrolled intercurrent life threatening illness including, but not limited to:
  • Ongoing or active infection
  • Symptomatic congestive heart failure
  • Unstable angina pectoris
  • Cardiac arrhythmia
  • Psychiatric illness/social situations that would limit compliance with study requirements
  • Any organ system dysfunction which, in the investigator's opinion, could compromise the subject's safety, interfere with the metabolism of ABBV 383 or put the study outcomes at undue risk specifically
  • A subject with history of stroke or intracranial hemorrhage within ≤ 24 weeks prior to registration
  • Concurrent light and/or heavy chain amyloidosis or central nervous system (CNS) involvement with Waldenström Macroglobulinemia (WM) (Bing Neel syndrome)
  • Active severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Note: If a subject has signs/symptoms suggestive of SARS-CoV-2 infection, the subject must have a negative molecular (e.g., PCR) test or 2 negative-antigen test results at least 24 hours apart. Subjects who meet SARS-CoV-2 infection exclusion criteria must be screen failed and may only rescreen after they meet the following SARS-CoV-2 infection viral clearance criteria
  • PRE-REGISTRATION: Other active malignancy other than WM ≤ 3 years prior to registration EXCEPTIONS: with the exception of a) adequately treated in situ carcinoma of the cervix uteri, b) adequately treated basal cell carcinoma of the skin or localized squamous cell carcinoma of the skin, c) prostate cancer Gleason grade 6 or lower AND with stable prostate specific antigen levels off treatment; d) previous malignancy confined and surgically resected (or treated with other modalities) with curative intent and unlikely to impact survival during the duration of the study
  • REGISTRATION: If any of the following exist at screening, subject will not be eligible for trial because this trial involves an investigational agent whose genotoxic, mutagenic and teratogenic effects on the developing fetus and newborn are unknown:
  • Pregnant women
  • Nursing women
  • Men or women of childbearing potential who are unwilling to employ adequate contraception (per protocol)

Study description and what participation involves

The registry record has no detailed description beyond the summary above.

AI summaryWhat participation may involve, in plain languageShow ▾Hide ▴

AI-written from the registry record, not the study's own wording. May contain errors or omissions. Check the registry text on this page and the original record ↗ before acting on it.

Participants receive ABBV-383 (given intravenously) on days 1 and 4 of the first 28‑day cycle and on day 1 of each subsequent 28‑day cycle, for up to 12 cycles unless the disease progresses or toxicity prevents further treatment. They will give blood and urine samples, undergo mandatory bone marrow aspiration and biopsy (invasive), and have CT or PET/CT imaging during screening and on study (more frequent imaging if extramedullary disease is present). Participants complete questionnaires and must have pregnancy testing and follow strict contraception rules; transfusions or growth‑factor support are permitted before baseline assessments to meet blood‑count requirements.

How the study is structured. Interventional, single-group (non-randomized), open-label Phase 1/2 trial. Participants receive intravenous ABBV-383 on a set schedule; Phase 1 evaluates dose-limiting toxicities to identify a recommended dose, and Phase 2 evaluates response rates and safety. No masking is used.

Questions you could ask

These questions are suggestions for a conversation with the study team or your own clinician, not advice.

  • The registry lists this study under Recurrent Waldenstrom Macroglobulinemia; Refractory Waldenstrom Macroglobulinemia. Does it apply to my diagnosis?
  • This is an early-phase study, mainly about safety and dose. What is already known about this treatment?
  • The listed sites are in United States. Is any of them reachable for me, and does the study help with travel?
  • Which of the eligibility criteria would need to be checked with tests before I could join?

More on Waldenström macroglobulinemia

Important dates

Study start
Sep 30, 2026 (estimated)
Primary completion
Sep 30, 2036 (estimated)
Study completion
Sep 30, 2036 (estimated)
Target enrollment
38 participants (estimated)
Last updated on registry
Oct 5, 2026
Data verified
Oct 10, 2026

Sponsor and research team

The lead sponsor funds and oversees the trial. A pharmaceutical or biotech company sponsor typically means the study is testing that company's drug or device; a hospital, university, or government agency usually indicates investigator-initiated or publicly funded research.

Lead sponsor
Mayo Clinic

Central study contact

If you're interested in participating, the central contact can answer general questions about the study — including eligibility requirements and how to find a recruiting site near you. Actual eligibility is determined by the site's medical team.

Participating sites (1)

Terms used on this page · explanations by MedicalUpdates.ai

relapsed
A condition that improved with treatment and has since returned or worsened.
refractory
A condition that has not responded to a treatment. 'Relapsed' means it responded and then came back; 'refractory' means it did not respond in the first place.
contraindicated
A reason a particular test or treatment should not be used for a person, for example a metal implant that rules out an MRI scan.
prior to screening
The checks done before enrolment to see whether a person qualifies, such as tests, scans or a review of medical history.
biopsy
Removal of a small piece of tissue so it can be examined under a microscope. 'Biopsy-proven' or 'histologically confirmed' means the diagnosis was confirmed by examining tissue under a microscope.
ECOG
A scale from 0 to 5 that describes how a person's condition affects daily activity. 0 means fully active; 1 means restricted in strenuous activity; 2 means able to self-care but unable to work; higher numbers mean more limitation.
bispecific
An engineered antibody that attaches to two targets at once, often linking an immune cell to a diseased cell so the immune cell can attack it.
Absolute neutrophil count
The number of neutrophils, a type of white blood cell that fights infection, in a blood sample. Studies often require it to be above a set level.
upper limit of normal
The highest value of a blood test that a laboratory considers normal. Criteria such as '≤ 3 × ULN' mean the result must be no more than three times that value.
creatinine clearance
A measure of kidney function, calculated from a blood creatinine level together with age, weight and sex.
childbearing potential
Studies often ask participants who could become pregnant, or could father a child, to use contraception during the study and for a period afterwards, because the effect of the treatment on a pregnancy is unknown.
study drug
A treatment that is being tested and has not been approved for this use. It may be approved for a different condition. Being studied does not mean it works or is available outside the study.
written informed consent
The process of explaining a study, including its risks and what participation involves, so that a person can decide freely whether to take part. Consent is usually documented in writing, and a participant can choose to leave the study later.
5 half-lives
The time it takes for the amount of a drug in the body to fall by half. 'Five half-lives' is often used as the point at which a previous drug has essentially left the body.
Autologous stem cell transplant
A procedure that replaces blood-forming cells after high-dose treatment. 'Autologous' uses the person's own cells collected beforehand; 'allogeneic' uses cells from a donor.
immunosuppressants
A medicine that reduces the activity of the immune system. Studies of autoimmune conditions often require a stable dose, a prior failure, or a washout of such medicines.
exclusion criteria
The conditions that rule a person out even if they meet the inclusion criteria, for example other illnesses, certain medicines or pregnancy.
Inclusion Criteria
The conditions a person must meet to be considered for the study, for example a confirmed diagnosis, an age range or a test result.

The study record on this page is reproduced from ClinicalTrials.gov, a database of the U.S. National Library of Medicine, where it was submitted by the study sponsor. MedicalUpdates.ai does not own this content, is not affiliated with or endorsed by ClinicalTrials.gov, NIH, or the U.S. Government, and does not verify the record. Plain-language notes, the glossary and the questions above are added by this site; text in the boxes marked "AI summary" was written by an AI model and may contain errors. Registry records change over time. Check the original record for the current version and discuss eligibility or participation with a qualified healthcare professional.

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