A Phase 4 interventional study of Acalabrutinib and Investigator's choice of treatment in Chronic Lymphocytic Leukaemia and Moderate to Severe Cardiac Impairment, sponsored by AstraZeneca. Recruiting at 23 sites in 6 countries. Open to participants aged 18 Years to 130 Years. Per ClinicalTrials.gov, last updated 2026-09-24.
Sponsored by AstraZeneca · Phase 4, Interventional, and Other
This will be a global Phase IV, open-label, randomised study to evaluate the safety and tolerability of acalabrutinib (monotherapy, 100 mg orally [po], twice daily [bd]) compared to investigator's choice of treatment, in patients with CLL (TN or R/R) and moderate to severe cardiac impairment. Patients with moderate to severe cardiac impairment will include those with moderate to severe cardiac conditions, who may have been excluded from previous acalabrutinib clinical trials and in whom the safety of acalabrutinib was not systematically assessed.
The study is planned to take place in approximately 25 centres globally. The study will be conducted in centres that have established close collaboration between the Haematology and Cardiology divisions, preferably with a cardio-oncologist on the team.
An IDMC will be responsible for making recommendations for study continuation.
Randomised controlled study:
Treatment phase:
Patients will receive treatment with either acalabrutinib 100 mg po tablets bd (until unacceptable toxicity or progression) or investigator's choice of treatment (chlorambucil, venetoclax, ibrutinib, zanabrutinib, rituximab or Obinutuzumab etc). For the control arm the treatment type and duration will be defined by the PI prior to randomisation.
Each treatment cycle is 28 days/4 weeks. Haematology visits (labs, physical exam), will be performed at the first day of each cycle for the first 8 cycles and every 4 cycles there after.
Response assessment will be performed by the PI in accordance with modified iwCLL 2018 criteria every 4 cycles (16 weeks). Imaging and BM testing only as deemed appropriate by PI.
Safety assessments will be performed at every visit.
Cardiology assessments will be performed at the end of cycle 1 (C2D1) and 3 (C4D1) and thereafter every 4 cycles (16 weeks). These assessments will include:
Cardiac MRI post-screening will be performed every year.
Decisions for permanent withdrawal or modifications to treatment due to cardiac AEs will be made by PI after close consultation with the cardiologist.
Post-Treatment Phase:
Safety assessments
Once treatment is discontinued due to any of the reasons mentioned above, a safety follow-up (SFU) will occur within 45 days of the last dose of treatment. This will occur regardless of the patient developing progressive disease or initiation a new anti-CLL therapy during that timespan. The evaluation will include:
The subsequent safety assessments will continue until disease progression, WoC, death or termination of study whichever occurs first.
These will mirror the in-treatment schedule, with cardiology consults including ECHO, ECG, cardiac biomarkers and 24 hour Holter performed every 16 weeks and yearly cardiac MRI. Once patient has progressive disease they will be contacted to assess survival status every 16 weeks.
Response assessments Patients that discontinue treatment prior to progression will continue to be evaluated for disease progression every 16 weeks. The response assessment will be per iwCLL 2018 guidelines and will be performed by the PI. Bone marrow testing and imaging will continue to remain optional and per PI discretion.
Once patient has progressive disease they will be contacted every 16 weeks for survival status and information on any new anti-cancer therapy until WoC, death, termination of study by Sponsor whichever occurs first.
190 studies on the registry are indexed under Leukemia, B-Cell; 52 are open to participants now.
This study's planned enrollment of 60 is above the median of 39 across 162 interventional studies indexed under Leukemia, B-Cell.
Browse Leukemia, B-Cell studies →AstraZeneca is the lead sponsor of 3,499 studies on the registry; 270 are open to participants now.
Of its 368 completed or terminated interventional studies of FDA-regulated products, 178 (48%) have results posted.
Counted across the registry records on this site, refreshed daily.
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.
Meet the following laboratory parameters:
Exclusion Criteria:
History of prior except for the following:
3 years before screening or felt to be at low risk for recurrence by treating physician.
(b) Adequately treated lentigo maligna melanoma without current evidence of disease or adequately resected non-melanomatous skin cancer (ie, basal cell carcinoma or squamous cell carcinoma of the skin). (c) Curatively treated in situ carcinoma of the cervix or carcinoma in situ of the prostate at any time prior to study without current evidence of disease. 10 Unable to swallow tablets or malabsorption syndrome, or disease significantly affecting gastrointestinal function, or resection of the stomach or small bowel or gastric bypass, symptomatic inflammatory bowel disease, or partial or complete bowel obstruction.
11 Active uncontrolled systemic infection (bacterial, fungal, viral or other) or localised infection. 12 Known history of infection with (HIV). 13 Serologic status reflecting active HepB or HepC infection.
(a) Patients with HepB core antibody positive who are surface antigen negative or who are HepC antibody positive will need to have a negative polymerase chain reaction (PCR) result before randomisation and must be willing to undergo deoxyribonucleic acid (DNA) PCR testing during the study. (b) Patients who are HepB surface antigen positive or HepB PCR positive and those who are HepC PCR positive will be excluded. 14 History of stroke or intracranial haemorrhage within 6 months prior to randomisation.
15 History of bleeding diathesis (eg, haemophilia, von Willebrand disease). 16 Requires or receiving anticoagulation with warfarin or equivalent vitamin K antagonists (eg, phenprocoumon) within 7 days of first dose of study treatment. Direct anti-X (DOACs) or low molecular weight heparins (LMWH, eg, enoxaparin) on stable dosing schedule is allowed. 17 Requires treatment with a strong cytochrome P450 3A () inhibitor/inducer. The use of strong CYP3A inhibitors within 1 week or strong CYP3A inducers within 3 weeks of the first dose of study treatment is prohibited. 18 Breastfeeding or pregnant. 19 Concurrent participation in another therapeutic clinical trial. 20 Uncontrolled cardiac/cardiovascular disease including the following:
i. Unstable IHD: percutaneous coronary intervention, coronary artery bypass surgery, or an episode of acute coronary syndrome including acute myocardial infarction and unstable angina pectoris. ii. Major cardiac surgery/procedures or valvular surgery. iii. Hospitalization due to heart failure. 21 Uncontrolled hypertension despite optimal management 22 Current life-threatening illness, medical conditions, organ system dysfunction or lifestyle habits which, in the investigator's opinion, could compromise the patient's safety or ability to adhere to the study protocol.
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.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
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.
The share of blood the heart’s main pumping chamber (the left ventricle) pushes out with each beat, measured by an echocardiogram (heart ultrasound) or a MUGA scan. About 50–70% is normal.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Relapsed: the illness came back after treatment had worked. Refractory: it did not respond to treatment, or stopped responding while still on it.
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Cancer that has spread to the leptomeninges, the thin layers covering the brain and spinal cord, and the fluid between them. It is not the same as brain metastases.
Criteria often treat it separately, and many studies leave it out even where treated brain metastases are allowed.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
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.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.
Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
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.
LVEF (left ventricular ejection fraction)
The share of blood the heart’s main pumping chamber (the left ventricle) pushes out with each beat, measured by an echocardiogram (heart ultrasound) or a MUGA scan. About 50–70% is normal.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Relapsed and refractory
Relapsed: the illness came back after treatment had worked. Refractory: it did not respond to treatment, or stopped responding while still on it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Absolute neutrophil count (ANC)
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Creatinine clearance (CrCl)
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Leptomeningeal disease
Cancer that has spread to the leptomeninges, the thin layers covering the brain and spinal cord, and the fluid between them. It is not the same as brain metastases.
Criteria often treat it separately, and many studies leave it out even where treated brain metastases are allowed.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Live vaccines
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
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.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CYP3A (CYP3A4) inhibitors and inducers
CYP3A is a group of enzymes, mainly CYP3A4, in the liver and gut that break down many medicines. Some medicines, supplements and foods (grapefruit, St John’s wort) slow them down or speed them up, which changes how much of a study drug stays in the body.
Studies list them so they can be avoided or switched; bring a list of everything you take, including supplements.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
All participants randomised to Arm A will receive treatment with the investigational product acalabrutinib.
Drug: Acalabrutinib
Patients in Arm B will receive investigator's choice of treatment its duration will be based on standard duration of therapy for that regimen or until disease progression/patient withdrawal/study termination, whichever occurs first.
Other: Investigator's choice of treatment
Acalabrutinib Monotherapy
Also known as: Calquence
control arm treatment type will be defined by the PI prior to randomisation
Also known as: Investigator's choice of treatment : i.e venetoclax, Rituximab, Obinutuzumab, Zanubrutinib etc.
Safety endpoints 1: To evaluate the incidence of CV (CardioVascular) adverse events leading to drug discontinuation after acalabrutinib treatment compared to investigators choice of treatment.
Frequency and time to discontinuation of any study treatment due to worsening in cardiovascular function or cardiovascular AEs.
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Safety endpoints 2: To evaluate the duration on treatment prior to drug discontinuation due to CV adverse events after acalabrutinib treatment compared to investigators choice of treatment.
Incidence of Grade 4 and 5 cardiovascular events of interest.
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Safety endpoints 3: To evaluate the incidence of life threatening and fatal cardiac events of interest after acalabrutinib treatment compared to investigators choice of treatment.
Incidence and relationship to study treatment of Grade ≥ 3 AEs.
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Safety endpoints 4: To evaluate the frequency of grade≥3 Adverse events after acalabrutinib treatment compared to investigators choice of treatment.
Incidence and relationship to study treatment
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Safety endpoints 5: To evaluate the frequency of AESI per Acalabrutinib IB after acalabrutinib treatment compared to investigators choice of treatment.
Incidence and relationship to study treatment of Non-cardiovascular AE that led to discontinuation of any study treatment.
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Safety endpoints 6: To evaluate the rate of discontinuation due to non-CV adverse events after acalabrutinib treatment compared to investigators choice of treatment.
Incidence and relationship to study treatment of Events of clinical interest (ECI) per acalabrutinib IB
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Safety endpoints 7: To evaluate the rate of any serious adverse event after acalabrutinib treatment compared to investigators choice of treatment.
Incidence and relationship to study treatment of Serious adverse events (SAEs).
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Efficacy Endpoints 1:To evaluate the overall survival after acalabrutinib treatment compared to investigators choice of treatment.
Overall survival (OS), defined as the time from randomisation to death from any cause. Per iwCLL 2018 criteria: • Event-free survival (EFS), defined as the time from randomisation to disease progression, initiation of subsequent anti-CLL therapy, or death from any cause, whichever occurs first.
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Efficacy Endpoints 2:To evaluate the overall response rate after acalabrutinib treatment compared to investigators choice of treatment.
Overall response rate (ORR), defined as the proportion of patients with a complete response (CR), complete response with incomplete bone marrow recovery (CRi), nodular partial response (nPR) or partial response (PR).
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Efficacy Endpoints 3: To evaluate the duration of response after acalabrutinib treatment compared to investigators choice of treatment.
Duration of response (DOR), defined as the time from the first documented response (PR or better) to disease progression or death (by any cause in the absence of disease progression).
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Efficacy Endpoints 4: To evaluate the progression free survival after acalabrutinib treatment compared to investigators choice of treatment.
Progression-free survival (PFS), defined as the time from randomisation to disease progression or death (by any cause in the absence of disease progression).
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
Efficacy Endpoints 5:To evaluate the event free survival after acalabrutinib treatment compared to investigators choice of treatment.
Overall response rate (ORR), defined as the proportion of patients with a complete response (CR), complete response with incomplete bone marrow recovery (CRi), nodular partial response (nPR) or partial response (PR).
Time frame: Visits are screening+ 8 visits( every 4 weeks) and then every 16 weeks until termination of the study which would be 4 years from the last subject randomized.
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.
Plan to share: Yes — Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal Vivli.org. All requests will be evaluated as per the AZ disclosure commitment: https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure. Yes, indicates that AZ are accepting requests for IPD, but this does not mean all requests will be shared.
Supporting information: Study protocol, Statistical analysis plan
Time frame: AstraZeneca will meet or exceed data availability as per the commitments made to the EFPIA PhRMA Data Sharing Principles. For details of our timelines, please rerefer to our disclosure commitment at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.
Access criteria: When a request has been approved AstraZeneca will provide access to the anonymized individual patient-level data via secure research environment Vivli.org. Signed Data Usage Agreement (non-negotiable contract for data accessors) must be in place before accessing requested information.
Data sharing details ↗ · vivli.org
No publications or documents are linked to this record.
Started Feb 2025 (actual). Primary completion is estimated for Sep 2032, 91 months after the start.
How these figures are worked out, and which studies are left out of them.
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Studies of the drug tested here: Acalabrutinib