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Richter SyndromePhase 2NCT06863402

Nemtabrutinib and Pembrolizumab for the Treatment of Richter Transformation, Diffuse Large B-cell Lymphoma Subtype

A Phase 2 study testing Biospecimen Collection, Bone Marrow Biopsy and Computed Tomography in people with Richter Syndrome and Diffuse Large B-Cell Lymphoma, run by Roswell Park Cancer Institute at 1 site in United States.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This phase II trial tests how well nemtabrutinib in combination with pembrolizumab works in treating patients with Richter transformation, diffuse large B-cell lymphoma subtype (RT-DLBCL). Nemtabrutinib is in a class of medications called kinase inhibitors. Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Biospecimen Collection, Bone Marrow Biopsy and Computed Tomography
Could I receive a placebo?
No, everyone receives an active treatment
How many people
32 participants
Where
1 siteUnited States
Study dates
15 Nov 2026to 1 Jun 2030
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patients with biopsy-proven Richter transformation, diffuse large B-cell lymphoma subtype (RT-DLBCL) from an antecedent or concurrently diagnosed chronic lymphocytic leukemia (CLL) and/or small lymphocytic lymphoma (SLL).
  • Be ineligible for frontline anthracycline-based chemoimmunotherapy (determined by treating investigator) OR have clinical evidence of disease progression after any prior treatment for RT-DLBCL.
  • Participants who have adverse events (AEs) due to previous anti-cancer therapies must have recovered to ≤ grade 1 or baseline. Participants with endocrine-related AEs who are adequately treated with hormone replacement or participants who have ≤ grade 2 neuropathy are eligible.
  • Note: Participants who have lingering cytopenias from prior anti-cancer therapy or progressive disease may be eligible at the discretion of the study principal investigator (PI), provided they meet all other study criteria.
  • Have measurable disease as determined by imaging (by positron-emission tomography [PET] and/or computed tomography [CT] scans), immunohistochemistry, and/or flow cytometry, as per the Cheson criteria.
  • Have the ability to swallow and retain oral medication.
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  • Age 18 years and older on the day of signing informed consent.
  • Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0-2.
  • Be free from other malignancy within 2 years prior to enrollment (with the exception of CLL/SLL, low-risk and early stage [T1-T2a- Gleason score ≤ 6, and prostate-specific antigen [PSA] < 10 ng/mL] prostate cancer, or localized skin cancer that has undergone potentially curative therapy).
  • Absolute neutrophil count: ANC ≥ 500 cells/µL (without G-CSF dose within the last 7 days prior to initiation of study treatment
  • Platelets: ≥ 25,000/µL -not requiring transfusion within the last 3 days prior to initiation of study treatment). Patients on medications that increase bleeding risk (e.g. systemic anticoagulation, anti-platelet therapies, etc.) must have a platelet count ≥50,000 /µL and have no history of major bleeding.
  • Hemoglobin: ≥ 7gm/dL (transfusion support allowed).
  • Total bilirubin: ≤ 1.5 x upper limit of normal (ULN) OR direct bilirubin ≤ ULN for participants with total bilirubin levels > 1.5 x ULN.
  • Aspartate aminotransferase (AST)(serum glutamic-oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT)(serum glutamic-pyruvic transaminase [SGPT]): ≤ 2.5 x ULN (≤ 5 x ULN for participants with liver metastases).
  • Creatinine clearance (CrCl): ≥ 30 mL/min (per Cockroft-Gault equation).
  • International normalized ratio (INR) (prothrombin [PT]/activated partial thromboplastin time [aPTT]): ≤ 1.5 x ULN, unless participant is receiving anticoagulant therapy, as long as PT or aPTT is within therapeutic range of intended use of anticoagulants.
  • Patients with history of human immunodeficiency virus (HIV) infection are potentially eligible (after conferring with the PI) if they meet ALL of the following criteria:
  • Must have a CD4+ T-cell count ≥ 350 cells/mm^3 AND an HIV viral load below the detectable level as per locally available testing at the time of screening
  • It is advised that participants must not have had any AIDS-defining opportunistic infections within the past 12 months.
  • Participants on anti-retroviral therapy (ART) must have been on a stable regimen, without changes in drugs or dose modification, for at least 4 weeks before study entry (day 1) and agree to continue ART throughout the study.
  • The combination ART regimen must not contain any antiretroviral medications that interact with strong CYP3A4 inhibitors/inducers/substrates (<https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and-drug-interactions-table-substrates-inhibitors-and-inducers>). Participants receiving ART that are strong CYP3A4 inducers are not eligible to be included in the study.
  • Participants who are hepatitis B surface antigen (HBsAg) positive are eligible if they have received hepatitis B virus (HBV) antiviral therapy for at least 4 weeks and have undetectable HBV viral load prior to randomization.
  • Note: Participants should remain on anti-viral therapy throughout study intervention and follow local guidelines for HBV anti-viral therapy post completion of study intervention. Hepatitis B screening tests, including HBsAg and hepatitis B core antibodies (anti-HBc), are required for all participants.
  • Participants with history of hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable at screening (Participants must have completed curative anti-viral therapy at least 4 weeks prior to the first administration of the study treatment).
  • A person of childbearing potential must have a negative urine or serum pregnancy within 72 hours prior to receiving the first dose of study medication. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required.
  • Participants of child-bearing potential must agree to use 2 methods of birth control or be surgically sterile or abstain from heterosexual activity for the course of the study through 6 months after the last dose of study medication. Should a person of child-bearing potential become pregnant or suspect they are pregnant while they or their partner is participating in this study, they should inform their treating physician immediately.
  • Participant must understand the investigational nature of this study and sign an Independent Ethics Committee/Institutional Review Board approved written informed consent form prior to receiving any study related procedure.

Who cannot join

  • Has received prior therapy with an anti-PD-1, anti-PD-L1, or anti-PDL2 agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (e.g., CTLA-4, OX40, CD137).
  • Has received prior systemic anti-cancer therapy within 5 half-lives or 14 days, whichever is lesser (or within 30 days for cellular therapy or investigational agents, or within 100 days post allogeneic hematopoietic stem cell transplantation and without any grade ≥ 2 graft versus host disease) prior to enrollment.
  • Has received prior radiotherapy within 2 weeks of start of study intervention or has radiation related toxicities requiring corticosteroids. Note: Two weeks or fewer of palliative radiotherapy for non-central nervous system (CNS) disease is permitted. The last radiotherapy treatment must have been performed at least 7 days before the first dose of study intervention.
  • Has received a live vaccine or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed or messenger ribonucleic acid (mRNA) vaccines is allowed.
  • Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (daily dose exceeding 10 mg of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drug.
  • Known additional malignancy that is progressing or has required active treatment within the past 2 years.
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  • Has known active CNS metastases and/or carcinomatous meningitis. Participants with previously treated brain metastases may participate provided they are radiologically stable, i.e. without evidence of progression for at least 4 weeks by repeat imaging (note that the repeat imaging should be performed during study screening), clinically stable and without requirement of steroid treatment for at least 14 days prior to first dose of study intervention. Has severe hypersensitivity (≥ grade 3) to pembrolizumab and/or any of its excipients.
  • Has severe hypersensitivity (≥ grade 3) to pembrolizumab and/or any of its excipients.
  • Has active autoimmune disease that has required systemic treatment in the past 2 years except replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid allowed).
  • Has a history of (non-infectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
  • Has an active infection requiring systemic therapy.
  • Has not adequately recovered from major surgery or has ongoing surgical complications.
  • Has a history or current evidence of any condition, therapy, or laboratory abnormality or other circumstance that might confound the results of the study, interfere with the participant's participation for the full duration of the study, such that it is not in the best interest of the participant to participate, in the opinion of the treating investigator.
  • Patients with pathologically confirmed Hodgkin-like RT (RT-classical Hodgkin's lymphoma [cHL]).
  • Estimated life expectancy of < 1 month as determined by the treating investigator.
  • Uncontrolled active illness including but not limited to heart failure, unstable ischemic heart disease, arrhythmia, psychiatric illness, acute renal failure, and any other conditions that would reasonably be expected to limit compliance with the study protocol.
  • Concurrent active Hepatitis B (defined as HBsAg positive and/or detectable HBV deoxyribonucleic acid [DNA]) and Hepatitis C virus (defined as anti-HCV Ab positive and detectable HCV RNA) infection.
  • Corrected QT interval (QTc) prolongation (defined as a Fridericia's corrected QT [QTcF] > 450 msecs) or other significant electrocardiogram (ECG) abnormalities including second degree atrioventricular (AV) block type II, third degree AV block, or bradycardia (ventricular rate less than 50 beats/min).
  • Is pregnant or breastfeeding or expecting to conceive or father children within the projected duration of the study, starting with the screening visit through 120 days after the last dose of trial treatment.
  • Unwilling or unable to follow protocol requirements.
  • Received any other investigational agent within 30 days prior to enrollment.
  • HIV-infected participants with a history of Kaposi's sarcoma and/or multicentric Castleman's disease.
  • History of severe bleeding disorder defined as an ongoing congenital or acquired condition that leads to an increased likelihood of bleeding.NOTE: Patients on active anti-coagulation, anti-platelet therapies, and other medications that may increase bleeding risks may be allowed on study, permitted that these potentially interacting drugs may be safely held in the setting of thrombocytopenia, and at the discretion of the treating investigator and with close monitoring.
  • Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the trial.
  • Has had an allogeneic tissue/solid organ transplant. Note: Patients with prior allogeneic hematopoietic stem cell transplant or allogeneic cellular therapy are allowed, provided they meet they meet the washout period.
  • Use of medications that are strong CYP3A4 inhibitors or inducers or P-gp and/or BCRP substrates with a narrow therapeutic index within 14 days prior to first dose of study treatment or 5 half-lives of the given drug, whichever is longer

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

United States1 site, 1 recruiting

  • Roswell Park Cancer Institute

    Buffalo, New York, 14263

    Matthew J. Cortese, 716-845-2326, Matthew.Cortese@RoswellPark.org

    Matthew J. Cortese

    Recruiting

Other trials in United States

About this study

Official title: Nemtabrutinib and Pembrolizumab in Patients With Richter Transformation: A Phase II Study

This phase II trial tests how well nemtabrutinib in combination with pembrolizumab works in treating patients with Richter transformation, diffuse large B-cell lymphoma subtype (RT-DLBCL). Nemtabrutinib is in a class of medications called kinase inhibitors. It blocks a protein called BTK, which is present on B-cells (a type of white blood cell) in cancers such as Richter transformation at abnormal levels. This may help keep cancer cells from growing and spreading. Immunotherapy with monoclonal antibodies, such as pembrolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of cancer cells to grow and spread. Giving nemtabrutinib in combination with pembrolizumab may kill more cancer cells in patients with RT-DLBCL.

Read the detailed description

PRIMARY OBJECTIVE:

  1. To evaluate the preliminary efficacy of nemtabrutinib and pembrolizumab as measured by the overall response rate (ORR) after 6 cycles for enrolled patients with Richter transformation, diffuse large B-cell lymphoma subtype (RT-DLBCL).

SECONDARY OBJECTIVES:

  1. To further evaluate preliminary efficacy as measured by complete response rate (CRR), duration of response (DOR), progression-free survival (PFS), and overall survival (OS) for enrolled patients.

II. To evaluate the safety and tolerability of nemtabrutinib and pembrolizumab combination treatment for RT-DLBCL.

III. Evaluate patient-reported outcomes on quality of life and disease-related symptoms and side-effects.

EXPLORATORY OBJECTIVES:

  1. To investigate the effects of nemtabrutinib and pembrolizumab exposure on peripheral blood mononuclear cell (PBMC) composition, particularly T-regulatory and cytotoxic T/natural killer (NK)-cell populations and correlate with clinical outcome/response.

II. To investigate the impact of nemtabrutinib and pembrolizumab on the fitness, function, and "stem-like" properties of chimeric antigen receptor (CAR) T-cells manufactured from specimens both pre- and post-treatment.

III. To evaluate the potential late effects of this novel combination treatment on CAR T-cell therapy and/or allogeneic hematopoietic stem cell transplant treated patients.

IV. To evaluate molecular subtypes of RT-DLBCL using multiomic and probabilistic classification approaches, as well as tumor characteristics (e.g. mutational profile and total mutational burden, PD-L1 expression, etc.), and correlate with clinical outcomes for enrolled subjects.

  1. To evaluate pharmacokinetic (PK) and pharmacodynamic (PD) data obtained from analyses of blood specimens collected throughout treatment (for both Nemtabrutinib as well as Pembrolizumab) to enable PopPK modeling, exposure-response analyses, and integrated assessments of PK/PD data with safety, efficacy, and activity.

OUTLINE:

Patients receive nemtabrutinib orally (PO) once daily (QD) on days 1-21 of each cycle and pembrolizumab intravenously (IV) over 30 minutes on day 1 of each cycle. Cycles repeat every 21 days for up to 35 cycles (2 years) in the absence of disease progression or unacceptable toxicity. Patients undergo echocardiography (ECHO) or multigated acquisition scan (MUGA) during screening, positron emission tomography (PET)/computed tomography (CT) or CT and blood sample collection throughout the trial. Patients may also undergo bone marrow biopsy throughout the trial.

After completion of study treatment, patients are followed up at 30 days then every 6 months for 3 years after completion of therapy or until death, whichever comes first, for a total of up to 5 years.

Being tested
Biospecimen Collection, Bone Marrow Biopsy, Computed Tomography, Echocardiography, Multigated Acquisition Scan
Medical subject headings
Lymphoma, Large B-Cell, Diffuse, Leukemia, Lymphocytic, Chronic, B-Cell

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Biospecimen CollectionProcedure or surgery

    Also called Biological Sample Collection, Biospecimen Collected, Specimen Collection

    Undergo blood sample collection

  • Bone Marrow BiopsyProcedure or surgery

    Also called Biopsy of Bone Marrow, Biopsy, Bone Marrow

    Undergo bone marrow biopsy

  • Computed TomographyProcedure or surgery

    Also called CAT, CAT Scan, Computed Axial Tomography, Computerized Axial Tomography

    Undergo PET/CT or CT

  • EchocardiographyProcedure or surgery

    Also called EC

    Undergo ECHO

  • Multigated Acquisition ScanProcedure or surgery

    Also called Blood Pool Scan, Equilibrium Radionuclide Angiography, Gated Blood Pool Imaging, Gated Heart Pool Scan

    Undergo MUGA

  • NemtabrutinibDrug

    Also called ARQ 531, ARQ-531, ARQ531, Bruton's Tyrosine Kinase Inhibitor ARQ 531

    Given PO

  • PembrolizumabBiological

    Also called BCD-201, GME 751, GME751, Keytruda

    Given IV

  • Positron Emission TomographyProcedure or surgery

    Also called Medical Imaging, Positron Emission Tomography, PET, PET Scan, Positron emission tomography (procedure)

    Undergo PET/CT

  • Questionnaire AdministrationOther

    Ancillary studies

Study groups in NCT06863402
Study groupRoleWhat they receive
Treatment (nemtabrutinib, pembrolizumab)ExperimentalPatients receive nemtabrutinib PO QD on days 1-21 of each cycle and pembrolizumab IV over 30 minutes on day 1 of each cycle. Cycles repeat every 21 days for up to 35 cycles (2 years) in the absence of disease progression or unacceptable toxicity. Patients undergo ECHO or MUGA during screening, PET/CT or CT and blood sample collection throughout the trial. Patients may also undergo bone marrow biopsy throughout the trial.
Receives: Procedure: Biospecimen Collection; Procedure: Bone Marrow Biopsy; Procedure: Computed Tomography; Procedure: Echocardiography; Procedure: Multigated Acquisition Scan; Drug: Nemtabrutinib; Biological: Pembrolizumab; Procedure: Positron Emission Tomography; Other: Questionnaire Administration

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Overall response rate

    Will be defined as having either a complete response (CR) or partial response (PR) as per Cheson et al., 2014. Will be summarized using frequencies and relative frequencies.

    Measured: After 6 cycles (approximately 18 weeks) (1 cycle = 21 days)

  2. Quality of life

    Tolerability and patient-reported outcomes (PROs) assessed using the European Organization for the Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (version 3) . EORTC-C 30 is measure from nat at all (better) to very much (worse)

    Measured: Up to 3 years after completion of study treatment

  3. Quality of life -PRO CTCAE

    Will be evaluated using the patient reported outcome PRO CTCAE measurement system. Responses are scored on a 0-5 point scale where higher outcomes indicate worse

    Measured: Up to 3 years after completion of study treatment

Secondary outcomes (5)

  1. Response outcomes

    CR, PR, stable disease (SD), CR+PR, and CR+PR+SD will be summarized using frequencies and relative frequencies, with response rates estimated using 90% credible regions obtained by Jeffrey's prior method.

    Measured: Up to 3 years after completion of study treatment

  2. Duration of response

    Will be summarized using standard Kaplan-Meier methods, where the median will be estimated with a 90% confidence interval.

    Measured: From first PR (or greater) until disease progression or last follow-up, assessed up to 3 years after completion of study treatment

  3. Overall survival

    Will be summarized using standard Kaplan-Meier methods, where the medians will be estimated with 90% confidence intervals.

    Measured: From treatment initiation until death due to any cause or last follow-up, assessed up to 3 years after completion of study treatment

  4. Progression-free survival

    Will be summarized using standard Kaplan-Meier methods, where the medians will be estimated with 90% confidence intervals.

    Measured: From treatment initiation until disease progression, death due to any cause, subsequent treatment, or last follow-up, assessed up to 3 years

  5. Incidence of adverse events

    Toxicities and adverse events will be reported using the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0. Will be summarized by attribution and grade using frequencies and relative frequencies.

    Measured: Up to 30 days after the last dose of study treatment

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted7 Mar 2025
  2. Study start15 Nov 2026 (estimated)
  3. Primary completion1 Jun 2029 (estimated)
  4. Study completion1 Jun 2030 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
32 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06863402
Sponsor's protocol ID
I-3586924
Other IDs
NCI-2025-01256, I-3586924
Status last verified
Oct 2026
First submitted
26 Feb 2025
Last updated
2 Oct 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Biospecimen Collection, Bone Marrow Biopsy and Computed Tomography in people with Richter Syndrome and Diffuse Large B-Cell Lymphoma, run by Roswell Park Cancer Institute at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 27 inclusion and 26 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 2 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Each site lists its own contact: choose the nearest one under Trial locations. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Overall response rate (time frame: After 6 cycles (approximately 18 weeks) (1 cycle = 21 days)). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT06863402.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 2 Oct 2026.

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