A Phase 1/2 interventional study of Tacabrutideg in B-cell Malignancy, Marginal Zone Lymphoma and Follicular Lymphoma, sponsored by BeOne Medicines. Recruiting at 114 sites in 16 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-05.
Sponsored by BeOne Medicines · Phase 1/2, Interventional, and Treatment
Study consists of two main parts to explore tacabrutideg recommended dosing, a Phase 1 monotherapy dose finding comprised of monotherapy dose escalation and monotherapy safety expansion of selected doses, and a Phase 2 (expansion cohorts)
A B-cell malignancy is a type of cancer that starts in white blood cells called B-cells. These cancers can affect the lymph nodes, bone marrow, blood, spleen, and other organs. Examples of these cancers include chronic lymphocytic leukemia/small lymphocytic lymphoma, marginal zone lymphoma, follicular lymphoma, Waldenström macroglobulinemia, mantle cell lymphoma, and diffuse large B cell lymphoma.
Tacabrutideg is a type of medicine called a BTK degrader. BTK (Bruton's tyrosine kinase) is a protein that helps cancer cells survive. Tacabrutideg is designed to attach to the BTK protein and tag it for removal, so that the body's own cellular "clean-up" system breaks it down and clears it away. When more BTK is removed from the body, it interferes with the signals needed for the cancer cells to multiply and survive and may also reduce the chance of the cancer becoming resistant to treatment.
The purpose of this study is to test whether tacabrutideg is safe and if it can treat B-cell malignancies. The main goals are to ensure the drug is safe by monitoring side effects and to understand how well patients respond to the treatment and whether their cancers shrink or disappear.
This study consists of two parts: dose escalation and dose expansion. During the dose escalation part, the study doctors will test different doses of the study drug to find the recommended dose that people can take without having serious side effects. During the dose expansion part, the study doctors will test the study drug in a larger number of people using the dose or doses identified from dose escalation. The study is open label, which means that the participants and the study doctors will know what treatment is received.
This study will enroll approximately 689 participants with B-cell malignancies at multiple centers worldwide.
The overall time to participate in this study is approximately 3 years. Participants will make regular visits to the clinic for treatment, health checks, blood tests, and tumor and imaging tests.
Our company, previously known as BeiGene, is now officially BeOne Medicines. Because some of our older studies were sponsored under the name BeiGene, you may see both names used for this study on this website.
875 studies on the registry are indexed under Lymphoma, B-Cell, Marginal Zone; 111 are open to participants now.
This study's planned enrollment of 689 is above the median of 40 across 681 interventional studies indexed under Lymphoma, B-Cell, Marginal Zone.
Browse Lymphoma, B-Cell, Marginal Zone studies →BeOne Medicines is the lead sponsor of 68 studies on the registry; 48 are open to participants now.
Of its 6 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Counted across the registry records on this site, refreshed daily.
The criteria were revised on the registry on Oct 5, 2026. See what changed
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Note: Other protocol defined Inclusion/Exclusion criteria may apply.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Line of therapy
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Adjuvant and neoadjuvant
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Biopsy and archival tissue
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Dose escalation in specific subtypes of non-Hodgkin lymphoma (NHL), including relapsed or refractory (R/R) marginal zone lymphoma (MZL), R/R follicular lymphoma (FL) Grades 1, 2, and 3a, R/R mantle cell lymphoma (MCL), R/R chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL), R/R diffuse large B-cell lymphoma (DLBCL), R/R Richter's transformation (RT), and R/R Waldenström macroglobulinemia (WM), to evaluate the safety and tolerability of tacabrutideg.
Drug: Tacabrutideg
Participants with R/R MZL, MCL, CLL/SLL, and WM will be enrolled at selected doses to help determine the recommended dose(s) for expansion (RDFE(s)) for tacabrutideg.
Drug: Tacabrutideg
Additional safety data will be collected from participants with R/R MZL, WM, RT, DLBCL, or FL to confirm the RDFE(s) of tacabrutideg for those with non-CLL/SLL/MCL histologies.
Drug: Tacabrutideg
Participants with R/R CLL/SLL will be enrolled at selected RDFE(s) to generate additional safety and efficacy data for tacabrutideg.
Drug: Tacabrutideg
Japanese participants with R/R MZL, FL, MCL, CLL/SLL, and WM will be enrolled at selected RDFE(s) to assess the safety and tolerability of tacabrutideg.
Drug: Tacabrutideg
Participants with CLL/SLL, MCL, WM, MZL, or Richter's transformation to DLBCL who have not received a prior BTKi (either covalent or noncovalent) will be enrolled at selected dose levels.
Drug: Tacabrutideg
Cohorts of participants with R/R CLL/SLL, R/R MCL, R/R WM, R/R MZL, R/R FL, R/R RT, and R/R DLBCL will be enrolled to receive the RDFE(s) identified in Phase 1 to further evaluate the safety and efficacy of tacabrutideg.
Drug: Tacabrutideg
Orally administered
Also known as: BGB-16673
Phase 1: Number of Participants with Adverse Events (AEs)
Number of participants with Treatment Emergent Adverse Events (TEAEs) and Serious Adverse Events (SAEs) including results from laboratory assessments, electrocardiograms (ECGs), and physical examinations, and that meet protocol-defined dose-limiting toxicities (DLTs); as graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) v5.0.
Time frame: From the first dose of tacabrutideg until 30 days after the last dose of the study drug or before the initiation of a new anticancer therapy, whichever occurs first (Up to 47 weeks)
Phase 1: Maximum Tolerated Dose (MTD) or Maximum Administered Dose (MAD) of Tacabrutideg
MTD is defined as the highest evaluated dose with an estimated toxicity rate closest to the target, while MAD is the highest dose given if MTD is not reached.
Time frame: Approximately 28 days
Phase 1: Recommended dose(s) for Expansion (RDFE) of tacabrutideg
RDFE of tacabrutideg alone will be determined based upon the MTD or MAD.
Time frame: Approximately 3 years
Phase 2: Overall response rate (ORR)
Defined as the percentage of participants achieving a best overall response of partial response (PR) or better, assessed by the Independent Review Committee for participants with R/R CLL/SLL and R/R WM (in participants with WM, this is also referred to as major response rate) and by the investigator for other cohorts (R/R MCL, R/R MZL, R/R FL, R/R non-GCB DLBCL, R/R Richter's transformation to DLBCL), evaluated using the Lugano criteria for NHL and SLL, International Workshop of Chronic Lymphocytic Leukemia (iwCLL) criteria for CLL, and the 11th International Workshop on Waldenstrom's Macroglobulinemia (IWWM-11) criteria for WM.
Time frame: approximately 3 years
Single dose and steady-state maximum observed plasma concentration (Cmax) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state minimum observed plasma concentration (Cmin) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state time to reach Cmax (tmax) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state elimination half-life (T1/2) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state area under the plasma concentration-time curve (AUC) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state apparent total clearance of drug from plasma after oral administration (CL/F) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state apparent volume of distribution (Vz/F) of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Single dose and steady-state accumulation ratios of tacabrutideg
Time frame: Week 1 Day 1 pre-dose; 2, 4, 6, 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose; and 2, 4, 6, 8 post-dose; Week 9 Day 1 pre-dose.
Bruton's tyrosine kinase (BTK) protein degradation in peripheral blood after tacabrutideg monotherapy
Time frame: Week 1 Day 1 pre-dose; 8, 24, 48, and 72 hours post-dose; Week 5 Day 1 pre-dose and 8 hours post-dose; Week 9 Day 1 pre-dose.
Phase 1: Overall response rate (ORR)
Defined as the percentage of participants whose best overall response is partial response or better, as assessed by the investigator and evaluated according to the following criteria: the International Workshop on Chronic Lymphocytic Leukemia (iwCLL) criteria for R/R CLL, the International Workshop on Waldenström's Macroglobulinemia (IWWM-11) criteria for R/R WM (in participants with WM, this is also referred to as major response rate), and the Lugano criteria for R/R NHL.
Time frame: approximately 3 years
Phase 1: Response Rate in Participants with R/R CLL/SLL
Defined as the percentage of participants with R/R CLL/SLL whose best overall response is better than stable disease, as determined by investigators.
Time frame: approximately 3 years
Phase 1: Overall Response Rate in Participants with R/R WM
Defined as the percentage of participants with R/R WM who have a response rate of minor response or better.
Time frame: approximately 3 years
Phase 1: Number of Participants with AEs in part 1e (Japan-only cohort)
Number of Japanese participants in Part 1e with TEAEs and SAEs, including results from laboratory assessments, ECGs, and physical examinations, that meet protocol-defined DLTs, graded according to the NCI-CTCAE v5.0.
Time frame: From the first dose of tacabrutideg in Part 1e until 30 days after the last dose of the study drug or before the initiation of a new anticancer therapy, whichever occurs first (approximately 3 years)
Phase 2: Recommended Phase 2 Dose (RP2D)
The Recommended Phase 2 Dose (RP2D) is determined by the sponsor based on the Safety Monitoring Committee's recommendations, taking into account the overall clinical safety, efficacy, pharmacokinetic (PK), and pharmacodynamic data.
Time frame: approximately 3 years
Phase 2: Number of Participants with AEs
Number of participants with TEAEs and SAEs, including results from laboratory assessments, ECGs, and physical examinations, graded according to the NCI-CTCAE v5.0.
Time frame: From the first dose of tacabrutideg in Phase 2 until 30 days after the last dose of the study drug or before the initiation of a new anticancer therapy, whichever occurs first (approximately 3 years)
Phase 2: ORR in Participants with CLL/SLL assessed by investigators
Defined as the percentage of participants with CLL/SLL with a best overall response of PR or better, as determined by investigators.
Time frame: approximately 3 years
Phase 2: Major Response Rate for Participants with WM assessed by investigator
Defined as the percentage of participants with WM whose best overall response is PR or better, as determined by investigators using the IWWM-11 criteria.
Time frame: approximately 3 years
Phase 2: Overall Response Rate for Participants with WM assessed by investigator and IRC
Defined as the percentage of participants who achieve at least a minor response (MR) or a more favorable outcome, as assessed by investigators for participants with R/R WM.
Time frame: approximately 3 years
Phase 2: Rate of Very Good Partial Response (VGPR) or Better in Participants with WM Assessed by Investigator and IRC
Defined as the percentage of participants with R/R WM with best response of VGPR or better as determined by IRC and investigator.
Time frame: approximately 3 years
Phase 2: Response Rate in Participants with R/R CLL/SLL Assessed by Investigator and IRC
Defined as the percentage of participants with R/R CLL/SLL whose best overall response is better than stable disease, as determined by IRC and investigator.
Time frame: approximately 3 years
Phase 2: Duration of Response (DOR)
DOR is defined as the time from the date that response criteria are first met to the date that progressive disease is documented or death, whichever comes first as assessed by the investigator and the IRC.
Time frame: approximately 3 years
Phase 2: Time to Overall Response (TTOR)
TTOR is defined as the time from study treatment start to date of the earliest qualifying response (partial response or better), as assessed by IRC and the investigator
Time frame: approximately 3 years
Phase 2: Time to Major Response (TTMR) in Participants with WM
Defined as the time from the date of treatment initiation to the date of first response of PR or better in participants with R/R WM.
Time frame: approximately 3 years
Phase 2: Time to Response in Participants with R/R CLL/SLL Assessed by Investigator and IRC
Defined as the time to first response based on best overall response of better than stable disease, per IRC and investigator.
Time frame: approximately 3 years
Phase 2: Time to Response in Participants with WM Assessed by Investigator and IRC
Defined as the time to first response based on best overall response of minor response or better, per IRC and investigator.
Time frame: approximately 3 years
Phase 2: Time to Next Treatment (TTNT)
Defined as the time from the treatment start date to the initiation of subsequent anticancer therapy.
Time frame: approximately 3 years
Phase 2: Progression- Free Survival (PFS)
PFS is defined as the time from first dose until first documentation of progression or death, whichever comes first, as assessed by IRC for R/R CLL/SLL and R/R WM and by the investigator for all participants.
Time frame: approximately 3 years
Phase 2: Overall Survival (OS)
OS is defined as the time from first study drug administration to the date of death due to any cause
Time frame: approximately 3 years
Phase 2: Functional Assessment of Cancer Therapy-Leukemia (FACT-Leu) questionnaire
Mean change from baseline in the 'physical well-being' and 'functional well-being' subscales of the FACT-Leu for participants with R/R CLL/SLL. FACT-Leu is a 44-item PRO questionnaire with five subscales used to measure health-related quality of life (HRQoL) in leukemia patients.
Time frame: Baseline and day 1 of Weeks 5, 13, 25, and 37
Phase 2: National Comprehensive Cancer Network/Functional Assessment of Cancer Therapy Lymphoma Cancer Symptom Index - 18 (NFLymSI-18)
Mean change from baseline in the NFlymSI-18 subscales of disease-related symptoms (DRSP) and 'treatment side effects' for participants with R/R MCL and participants with R/R WM. The NFlymSI-18 is an 18-item patient-reported outcome (PRO) tool specifically designed to assess symptoms and treatment impacts in patients with non-Hodgkin lymphoma.
Time frame: Baseline and day 1 of Weeks 5, 13, 25, and 37
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Not enrolling at this site — choose another above.
Showing the first 100 of 114 sites across 16 countries. Choose a country and city above to see the rest.
Plan to share: Yes — BeOne shares data on completed studies responsibly and provides qualified scientific and medical researchers access to data and supporting documentation for clinical trials in dossiers for medicines and indications after submission and approval in the United States, China, and Europe. Clinical trials supporting subsequent local approvals, new indications, or combination products are eligible for sharing once corresponding regulatory approvals are achieved. BeOne shares data only when permitted by applicable data privacy and security laws and regulations, when it is feasible to do so without compromising the privacy of study participants, and other considerations. Qualified researchers with appropriate competencies who are engaged in novel scientific research may submit a request for participant-level data with a research proposal for BeOne review. Research teams must include a biostatistician and sign a Data Sharing Agreement prior to receiving access to clinical trial data.
Supporting information: Study protocol, Statistical analysis plan, Clinical study report
Time frame: See plan description
Access criteria: See plan description
Data sharing details ↗ · beonemedicines.com
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Studies of the drug tested here: Tacabrutideg
Lymphoma, B-Cell, Marginal Zone →