NCT05254743 · Loxo Oncology, Inc.
A Study of Pirtobrutinib (LOXO-305) Versus Ibrutinib in Participants With Chronic Lymphocytic Leukemia (CLL)/Small Lymphocytic Lymphoma (SLL)
(BRUIN-CLL-314)
What this study is about
The purpose of Part 1 of this study is to compare the effectiveness and safety of pirtobruitinib (LOXO-305) to ibrutinib in participants with CLL/SLL; participants may or may not have already had treatment for their cancer. The purpose of Part 2 of this study evaluates pirtobrutinib treatment given alone in treatment-naïve participants with CLL/SLL with 17p deletions.
View original scientific description
The purpose of Part 1 of this study is to compare the efficacy and safety of pirtobruitinib (LOXO-305) to ibrutinib in participants with CLL/SLL; participants may or may not have already had treatment for their cancer. The purpose of Part 2 of this study evaluates pirtobrutinib monotherapy in treatment-naïve participants with CLL/SLL with 17p deletions. Participation could last up to six years for Part 1. Participation could last up to 2 years for Part 2.
Interventions
DRUG
Pirtobrutinib
Administered orally.
DRUG
Ibrutinib
Administered orally.
Primary outcome measures
Percentage of Participants Achieving Complete Response (CR), Complete Remission with Incomplete Hematologic Recovery (Cri), Nodular Partial Remission (nPR) or Partial Response (PR): Overall Response Rate (ORR) Part 1
Time frame: Baseline to best overall response the best response recorded from Cycle 1 Day 1 until data cutoff date, PD, or start of new anticancer treatment, whichever is the earliest] (approximately 3 years and 5 months)
ORR as assessed by independent review committee (IRC) per International Workshop on Chronic Lymphocytic Leukemia (iwCLL) 2018 criteria
Percentage of Participants Achieving Complete Response (CR), Complete Remission with Incomplete Hematologic Recovery (CRi), Nodular Partial Remission (nPR) or Partial Response (PR): Overall Response Rate (ORR) Part 2
Time frame: Baseline to best overall response the best response recorded from Cycle 1 Day 1 until data cutoff date, PD, or start of new anticancer treatment, whichever is the earliest (Approximately 2 years and 3 months)
ORR as assessed by independent review committee (IRC) per International Workshop on Chronic Lymphocytic Leukemia (iwCLL) 2018 criteria
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Confirmed diagnosis of CLL/SLL requiring therapy per iwCLL 2018 criteria
- Part 1 - Known 17p deletion status (wildtype or deleted). Part 2 - Must have deletion of 17p as determined by FISH testing
- Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2
- Adequate organ function
- Platelets greater than or equal to ≥ 50 x 10⁹/liter (L) or ≥30 x 10⁹/L in participants with documented bone marrow involvement considered to impair hematopoiesis,
- Hemoglobin ≥8 grams/deciliter (g/dL) or ≥6 g/dL in participants with documented bone marrow involvement considered to impair hematopoiesis
- Absolute neutrophil count ≥0.75 x 10⁹/L or ≥0.50 × 10⁹/L in participants with documented bone marrow involvement considered to impair hematopoiesis
- Kidney function: Estimated creatinine clearance ≥30 milliliters per minute (mL/min)
Exclusion criteria
- Known or suspected Richter's transformation to diffuse large B-cell lymphoma (DLBCL), prolymphocytic leukemia,
Where
- Anaheim, California
- Cerritos, California
- Palo Alto, California
- San Marcos, California
- Fort Myers, Florida
- Saint Augustine, Florida
- West Palm Beach, Florida
- Baton Rouge, Louisiana
- New Orleans, Louisiana
- Bethesda, Maryland
- Billings, Montana
- York, Pennsylvania
And 6 more locations — see the full list below.
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jun 17, 2026 · Source of record for eligibility and locations