A Phase 1 interventional study of Lonitoclax (ZE50-0134) in CLL / SLL, CLL (Chronic Lymphocytic Leukemia) and SLL (Small Lymphocytic Lymphoma), sponsored by Lomond Therapeutics Holdings, Inc.. Recruiting at 5 sites in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-07-31.
Sponsored by Lomond Therapeutics Holdings, Inc. · Phase 1, Interventional, and Treatment
This Phase 1, open-label, multicenter study is evaluating the safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary antitumor activity of lonitoclax (ZE50-0134) in adults with relapsed or refractory chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL), and select low-grade B-cell lymphomas.
The study has two sequential parts. Part 1 uses dose escalation to determine the biologically effective dose and/or maximum tolerated dose of lonitoclax. Participants receive a 3-day step-up regimen followed by continuous once-daily or twice-daily oral dosing in 28-day cycles. Part 2 is a randomized dose-expansion comparison of two selected lonitoclax dose levels in venetoclax-naive participants with relapsed or refractory CLL/SLL. Treatment may continue for up to 12 cycles and, for participants deriving clinical benefit, for up to 24 cycles with approval from the Medical Monitor.
This is an open-label, multicenter Phase 1 study with two sequential parts.
Part 1 is a non-randomized dose-escalation study in participants with relapsed or refractory CLL/SLL or select low-grade lymphomas. A standard 3+3 design is used to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary antitumor activity of lonitoclax (ZE50-0134), and to identify a biologically effective dose and/or maximum tolerated dose. Planned dose levels include once-daily and twice-daily regimens. Dose Levels 6a and 6b may enroll concurrently. Dose-limiting toxicities are evaluated during Cycle 1.
To reduce the risk of tumor lysis syndrome, participants receive intravenous hydration beginning on Day -1 and a 3-day step-up dosing regimen as inpatients. After step-up dosing, the assigned lonitoclax dose is administered orally once daily or twice daily in a fed state. Each treatment cycle is 28 days.
Part 2 is a randomized dose-expansion portion in venetoclax-naive participants with relapsed or refractory CLL/SLL. Approximately 15 participants are assigned to each of two selected dose levels: the biologically effective dose or maximum tolerated dose and one lower dose level, provided activity is observed. Part 2 evaluates safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary antitumor activity to support selection of a recommended Phase 2 dose.
Treatment is continuous for up to 12 cycles. Participants deriving clinical benefit may continue treatment for up to 24 cycles at the investigator's discretion with Medical Monitor approval. Participants are followed for safety after treatment and for disease progression, subsequent treatment, and survival.
2,036 studies on the registry are indexed under Leukemia, Lymphocytic, Chronic, B-Cell; 237 are open to participants now.
This study's planned enrollment of 84 is above the median of 39 across 1,603 interventional studies indexed under Leukemia, Lymphocytic, Chronic, B-Cell.
Browse Leukemia, Lymphocytic, Chronic, B-Cell studies →Lomond Therapeutics Holdings, Inc. is the lead sponsor of 5 studies on the registry; 3 are open to participants now.
Compared within Leukemia, Lymphocytic, Chronic, B-Cell, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Leukemia, B-Cell. The counts are of registry records indexed under each term, refreshed daily. How we classify →
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.
Disease as defined below:
Adequate bone marrow, liver, and renal function during screening:
Exclusion Criteria:
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.
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.
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.
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.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Able to have children. For women this usually means from the first period until menopause, unless permanently unable to through surgery; for men, unless permanently sterile. Read who the line is about — participants, women, men, or their partners.
Criteria about it usually ask for contraception during the study and for a time after it.
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.
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.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
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.
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
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.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Stem cell (bone marrow) transplants. Allogeneic uses cells from a donor; autologous uses your own cells, collected earlier and given back.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
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.
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.
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.
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.
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.
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.
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.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Reproductive potential
Able to have children. For women this usually means from the first period until menopause, unless permanently unable to through surgery; for men, unless permanently sterile. Read who the line is about — participants, women, men, or their partners.
Criteria about it usually ask for contraception during the study and for a time after it.
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.
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.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
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.
NYHA class (heart failure)
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
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.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Allogeneic and autologous transplant
Stem cell (bone marrow) transplants. Allogeneic uses cells from a donor; autologous uses your own cells, collected earlier and given back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
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.
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.
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.
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.
Optional de-escalation cohort. Participants receive lonitoclax 25 mg once daily on Day 1, 50 mg once daily on Day 2, and 75 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 25 mg once daily on Day 1, 50 mg once daily on Day 2, and 100 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 50 mg once daily on Day 1, 100 mg once daily on Day 2, and 200 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 50 mg once daily on Day 1, 100 mg once daily on Day 2, and 400 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 50 mg once daily on Day 1, 100 mg once daily on Day 2, and 600 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 50 mg once daily on Day 1, 100 mg once daily on Day 2, and 800 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 100 mg once daily on Day 1, 250 mg once daily on Day 2, and 1000 mg once daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles. Dose Levels 6a and 6b may enroll concurrently.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 50 mg twice daily on Day 1, 100 mg twice daily on Day 2, and 500 mg twice daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles. Dose Levels 6a and 6b may enroll concurrently.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 100 mg twice daily on Day 1, 250 mg twice daily on Day 2, and 750 mg twice daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants receive lonitoclax 100 mg twice daily on Day 1, 250 mg twice daily on Day 2, and 1000 mg twice daily on Day 3 and thereafter. Treatment is administered orally in a fed state in 28-day cycles.
Drug: Lonitoclax (ZE50-0134)
Participants with relapsed or refractory CLL/SLL who are venetoclax naive are randomized to a selected lonitoclax dose corresponding to the biologically effective dose or maximum tolerated dose identified in Part 1. The selected regimen may be once daily or twice daily. Approximately 15 participants are planned.
Drug: Lonitoclax (ZE50-0134)
Participants with relapsed or refractory CLL/SLL who are venetoclax naive are randomized to one lonitoclax dose level below the biologically effective dose or maximum tolerated dose selected in Part 1, provided activity is observed. The selected regimen may be once daily or twice daily. Approximately 15 participants are planned.
Drug: Lonitoclax (ZE50-0134)
Lonitoclax is supplied as immediate-release white opaque soft gelatin capsules in 25 mg, 100 mg, and 250 mg strengths. Participants receive a 3-day step-up regimen followed by the assigned oral dose once daily (QD) or twice daily (BID) in a fed state, administered within 1 hour of food. Each cycle is 28 days. Treatment continues for up to 12 cycles and may continue for up to 24 cycles in participants deriving clinical benefit, at the investigator's discretion with Medical Monitor approval. Participants receive inpatient monitoring and tumor lysis syndrome prophylaxis during the initial step-up period.
Incidence and severity of treatment-emergent adverse events and serious adverse events
Number and percentage of participants with treatment-emergent adverse events, serious adverse events, clinically significant laboratory abnormalities, adverse events related to lonitoclax, and adverse events leading to treatment discontinuation. Adverse events are graded using NCI CTCAE Version 5.0.
Time frame: From first dose through 30 days after the last dose; treatment may continue for up to 24 cycles (28 days per cycle).
Incidence of dose-limiting toxicities in Part 1
Number and percentage of Part 1 participants experiencing a protocol-defined dose-limiting toxicity during the dose-limiting toxicity assessment period.
Time frame: Cycle 1 (Days 1-28).
Determination of the biologically effective dose and/or maximum tolerated dose
The selected dose is determined from the totality of safety, dose-limiting toxicity, pharmacokinetic, pharmacodynamic, and early response data across Part 1 dose cohorts according to the protocol-defined dose-escalation rules.
Time frame: After completion of Cycle 1 for evaluable participants in each Part 1 dose cohort.
Overall Response Rate (ORR)
Proportion of participants whose best overall response is partial response or better, as assessed by the investigator using iwCLL criteria for CLL, Lugano criteria for SLL and other applicable low-grade lymphomas, or Waldenstrom response criteria, as applicable.
Time frame: From first dose through end of treatment, up to 24 cycles (28 days per cycle).
Duration of response (DOR)
For participants with partial response or better, time from the first documented response until disease progression or death from any cause.
Time frame: From first documented response until progression, death, withdrawal, loss to follow-up, or sponsor termination; assessed during treatment and long-term follow-up.
Progression-free survival (PFS)
Time from first dose until disease progression by the applicable disease-specific response criteria or death from any cause.
Time frame: From first dose until progression, death, withdrawal, loss to follow-up, or sponsor termination; assessed during treatment and long-term follow-up.
Time to next treatment (TTNT)
Time from first dose of lonitoclax to initiation of a non-protocol anticancer treatment for CLL/SLL or death.
Time frame: From first dose until initiation of new anticancer treatment, death, withdrawal, loss to follow-up, or sponsor termination.
Maximum observed plasma concentration (Cmax) of lonitoclax
Maximum observed plasma concentration derived from serial plasma concentration measurements after lonitoclax administration.
Time frame: Cycle 1 Days 1-4, 8, 15, and 22; Cycle 2 Days 1-2; and end-of-treatment/early-termination sampling as applicable.
Area under the plasma concentration-time curve (AUC) of lonitoclax
AUC derived from serial plasma concentration measurements. For QD dosing, planned calculations include AUC0-8h or AUC0-6h and AUC0-24h. For BID dosing, planned calculations include AUC0-8h or AUC0-6h after the morning dose.
Time frame: Cycle 1 Days 1-3 and Cycle 2 Day 1, based on protocol-specified serial PK sampling.
Rate of undetectable measurable residual disease in blood and bone marrow
Proportion of evaluable participants with undetectable measurable residual disease by flow cytometry and/or next-generation sequencing, including bone marrow assessment after 12 cycles.
Time frame: Peripheral blood at the ends of Cycles 3, 6, 9, and 12; bone marrow at the end of Cycle 12.
Change from baseline in caspase 3 activation
Change in caspase 3 activation in CLL or lymphoma cells and exploratory relationship with lonitoclax pharmacokinetics and clinical response.
Time frame: Screening/baseline through Cycle 1 Day 4.
Change from baseline in immune-cell populations
Change in absolute numbers of CD8 T cells, natural killer cells, and normal B cells during lonitoclax treatment.
Time frame: Baseline; Cycle 1 Day 1; Cycle 2 Day 1; Cycle 4 Day 1; Cycle 7 Day 1; and safety follow-up/end of treatment/early termination, as applicable.
Molecular and protein markers associated with resistance or response
Exploratory evaluation of serial samples for BCL2, BAX, and other escape mutations; expression of alternative BCL2-family proteins; alternative biomarkers; and clonal evolution in relation to response, progression, and resistance.
Time frame: Baseline and serially during treatment, with additional sampling at relapse/progression and end of treatment, as available.
Overall survival
Time from first dose until death from any cause.
Time frame: From first dose until death, withdrawal of consent, loss to follow-up, or sponsor termination; survival follow-up approximately every 3 months.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
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Leukemia, Lymphocytic, Chronic, B-Cell →
Lomond Therapeutics Holdings, Inc.