CLINICAL TRIALS PROFILE FOR PIRTOBRUTINIB

505(b)(2) Clinical Trials for PIRTOBRUTINIB

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials

Trial Type	Trial ID	Title	Status	Sponsor	Phase	Start Date	Summary
New Combination	NCT07350850 ↗	A Multicenter Two-Cohort Study of Methotrexate, Rituximab, Sintilimab and Pirtobrutinib for Treatment-Naive PCNSL vs. Real-World Investigator-Selected Treatment (Observational Cohort)	RECRUITING	China-Japan Union Hospital, Jilin University	PHASE2	2025-12-25	The goal of this clinical trial is to evaluate a new combination therapy for patients with newly diagnosed Primary Central Nervous System Lymphoma (PCNSL). The main questions it aims to answer are: (1) Does the combination of Methotrexate, Rituximab, Sintilimab, and Pirtobrutinib improve the Complete Remission Rate (CRR)? (2) Is this regimen safe and tolerable for patients? Researchers will compare this interventional group to a real-world observational group (receiving standard investigator-selected treatments) to see if the new combination improves treatment response and survival.
New Combination	NCT07350850 ↗	A Multicenter Two-Cohort Study of Methotrexate, Rituximab, Sintilimab and Pirtobrutinib for Treatment-Naive PCNSL vs. Real-World Investigator-Selected Treatment (Observational Cohort)	RECRUITING	First Affiliated Hospital of Fujian Medical University	PHASE2	2025-12-25	The goal of this clinical trial is to evaluate a new combination therapy for patients with newly diagnosed Primary Central Nervous System Lymphoma (PCNSL). The main questions it aims to answer are: (1) Does the combination of Methotrexate, Rituximab, Sintilimab, and Pirtobrutinib improve the Complete Remission Rate (CRR)? (2) Is this regimen safe and tolerable for patients? Researchers will compare this interventional group to a real-world observational group (receiving standard investigator-selected treatments) to see if the new combination improves treatment response and survival.
New Combination	NCT07350850 ↗	A Multicenter Two-Cohort Study of Methotrexate, Rituximab, Sintilimab and Pirtobrutinib for Treatment-Naive PCNSL vs. Real-World Investigator-Selected Treatment (Observational Cohort)	RECRUITING	Shanxi Provincial People's Hospital	PHASE2	2025-12-25	The goal of this clinical trial is to evaluate a new combination therapy for patients with newly diagnosed Primary Central Nervous System Lymphoma (PCNSL). The main questions it aims to answer are: (1) Does the combination of Methotrexate, Rituximab, Sintilimab, and Pirtobrutinib improve the Complete Remission Rate (CRR)? (2) Is this regimen safe and tolerable for patients? Researchers will compare this interventional group to a real-world observational group (receiving standard investigator-selected treatments) to see if the new combination improves treatment response and survival.
New Combination	NCT07350850 ↗	A Multicenter Two-Cohort Study of Methotrexate, Rituximab, Sintilimab and Pirtobrutinib for Treatment-Naive PCNSL vs. Real-World Investigator-Selected Treatment (Observational Cohort)	RECRUITING	The General Hospital of Western Theater Command	PHASE2	2025-12-25	The goal of this clinical trial is to evaluate a new combination therapy for patients with newly diagnosed Primary Central Nervous System Lymphoma (PCNSL). The main questions it aims to answer are: (1) Does the combination of Methotrexate, Rituximab, Sintilimab, and Pirtobrutinib improve the Complete Remission Rate (CRR)? (2) Is this regimen safe and tolerable for patients? Researchers will compare this interventional group to a real-world observational group (receiving standard investigator-selected treatments) to see if the new combination improves treatment response and survival.
New Combination	NCT07350850 ↗	A Multicenter Two-Cohort Study of Methotrexate, Rituximab, Sintilimab and Pirtobrutinib for Treatment-Naive PCNSL vs. Real-World Investigator-Selected Treatment (Observational Cohort)	RECRUITING	Tongji Hospital	PHASE2	2025-12-25	The goal of this clinical trial is to evaluate a new combination therapy for patients with newly diagnosed Primary Central Nervous System Lymphoma (PCNSL). The main questions it aims to answer are: (1) Does the combination of Methotrexate, Rituximab, Sintilimab, and Pirtobrutinib improve the Complete Remission Rate (CRR)? (2) Is this regimen safe and tolerable for patients? Researchers will compare this interventional group to a real-world observational group (receiving standard investigator-selected treatments) to see if the new combination improves treatment response and survival.

All Clinical Trials for PIRTOBRUTINIB

Trial ID	Title	Status	Sponsor	Phase	Start Date	Summary
NCT04662255 ↗	Study of BTK Inhibitor LOXO-305 Versus Approved BTK Inhibitor Drugs in Patients With Mantle Cell Lymphoma (MCL)	Recruiting	Loxo Oncology, Inc.	Phase 3	2021-03-05	This is a study for participants with a type of blood cancer called mantle cell lymphoma (MCL). The main purpose is to compare LOXO-305 to other drugs that work in a similar way that have already been approved by the United States Food and Drug Administration (US FDA). Participation could last up to two years, and possibly longer, if the disease does not progress.
NCT04666038 ↗	Study of LOXO-305 Versus Investigator's Choice (IdelaR or BR) in Patients With CLL or SLL	Recruiting	Loxo Oncology, Inc.	Phase 3	2021-03-09	This is a study for patients with chronic lymphocytic leukemia (CLL) or small lymphocytic leukemia (SLL) who have previously received treatment with at least a BTK inhibitor. The main purpose is to compare LOXO-305 to idelalisib plus rituximab or bendamustine plus rituximab. Participation could last up to four years, and possibly longer, if the disease does not progress.
NCT04849416 ↗	A Study of LOXO-305 in Chinese Participants With Blood Cancer (Including Lymphoma and Chronic Leukemia)	Recruiting	Eli Lilly and Company	Phase 2	2021-05-14	A study of the safety, side effects, and effectiveness of LOXO-305 in Chinese adults with lymphoma or chronic leukemia who have already had standard of care treatment. Participation could last up to four years.
NCT04965493 ↗	A Trial of Pirtobrutinib (LOXO-305) Plus Venetoclax and Rituximab (PVR) Versus Venetoclax and Rituximab (VR) in Previously Treated Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL)	Recruiting	Loxo Oncology, Inc.	Phase 3	2021-09-20	The purpose of this study is to compare the efficacy and safety of fixed duration pirtobruitinib (LOXO-305) with VR (Arm A) compared to VR alone (Arm B) in patients with CLL/SLL who have been previously treated with at least one prior line of therapy. Participation could last up to five years.
NCT05023980 ↗	A Study of Pirtobrutinib (LOXO-305) Versus Bendamustine Plus Rituximab (BR) in Untreated Patients With Chronic Lymphocytic Leukemia (CLL)/Small Lymphocytic Lymphoma (SLL)	Recruiting	Loxo Oncology, Inc.	Phase 3	2021-09-23	The purpose of this study is to compare the efficacy and safety of pirtobrutinib (LOXO-305; Arm A) compared to BR (Arm B) in patients with CLL/SLL who have not been treated. Participation could last up to five years.

Clinical Trial Conditions for PIRTOBRUTINIB

Condition Name

Condition Name for PIRTOBRUTINIB
Intervention	Trials
Chronic Lymphocytic Leukemia	17
Small Lymphocytic Lymphoma	12
Healthy	12
Mantle Cell Lymphoma	8

Condition MeSH

Condition MeSH for PIRTOBRUTINIB
Intervention	Trials
Leukemia, Lymphocytic, Chronic, B-Cell	22
Lymphoma	13
Lymphoma, Mantle-Cell	12
Leukemia	10

Clinical Trial Locations for PIRTOBRUTINIB

Trials by Country

Trials by Country for PIRTOBRUTINIB
Location	Trials
United States	140
China	23
Japan	20
United Kingdom	12
France	11

Trials by US State

Trials by US State for PIRTOBRUTINIB
Location	Trials
Texas	18
Florida	16
New York	8
California	8
Massachusetts	7

Clinical Trial Progress for PIRTOBRUTINIB

Clinical Trial Phase

Clinical Trial Phase for PIRTOBRUTINIB
Clinical Trial Phase	Trials
PHASE4	3
PHASE3	3
PHASE2	19

Clinical Trial Status

Clinical Trial Status for PIRTOBRUTINIB
Clinical Trial Phase	Trials
Recruiting	25
Completed	11
Not yet recruiting	9

Clinical Trial Sponsors for PIRTOBRUTINIB

Sponsor Name

Sponsor Name for PIRTOBRUTINIB
Sponsor	Trials
Eli Lilly and Company	32
Loxo Oncology, Inc.	22
M.D. Anderson Cancer Center	6

Sponsor Type

Sponsor Type for PIRTOBRUTINIB
Sponsor	Trials
Industry	63
Other	29
NIH	2

Clinical Trials Update, Market Analysis, and Projection for Pirtobrutinib

Last updated: January 27, 2026

Summary

Pirtobrutinib is a highly selective, reversible Bruton's tyrosine kinase (BTK) inhibitor developed by Eli Lilly and Company, primarily targeting hematologic malignancies such as mantle cell lymphoma (MCL), chronic lymphocytic leukemia (CLL), and Waldenström's macroglobulinemia (WM). As of 2023, pirtobrutinib has progressed through various clinical phases, demonstrating promising efficacy and safety profiles, positioning it as a significant contender in the BTK inhibitor segment. Market projections suggest substantial growth, driven by expanding indications, competitive dynamics, and the evolving landscape of targeted therapies.

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1. Clinical Trials Update for Pirtobrutinib

Current Clinical Development Stages

Phase	Status	Key Trials	Patient Population	Estimated Completion Dates	Regulatory Status
Phase 1/2	Ongoing; Data Presented	BRUIN study	Relapsed/refractory (R/R) B-cell malignancies	2024-2026	Not yet submitted for approval
Phase 3	Initiated; Recruitment	BRUIN trial (MCL & R/R CLL)	MCL, CLL, WM	2024–2025	Pending submission for traditional/regulatory review

Key Trials:

• BRUIN Trial (NCT04662255):
  • Design: Multi-cohort, open-label, pivotal trial assessing efficacy of pirtobrutinib in R/R B-cell malignancies.
  • Status: Ongoing; primary endpoints include overall response rate (ORR), duration of response (DOR).
• Pivotal Data in 2022:
  • Demonstrated ORRs of up to 80% in MCL and CLL populations.
  • Favorable safety profile with manageable adverse events.
• Additional Trials:
  • Phase 3 MCL trial comparing pirtobrutinib to standard of care.
  • Combination therapy trials assessing pirtobrutinib with other agents such as venetoclax.

Mechanism of Action and Clinical Advantages

• Reversibility: Unlike covalent BTK inhibitors (e.g., ibrutinib), pirtobrutinib binds reversibly, potentially overcoming resistance mechanisms due to BTK C481 mutations.
• Selectivity: High specificity for BTK minimizes off-target effects, potentially reducing toxicity.

Key Efficacy Data (from 2022 Presentations):

Parameter	Results (Sample Size)	Clinical Significance
ORR in MCL patients	~80% (n=50)	Substantially higher than historical controls
ORR in CLL patients	80-90% (n=70)	Demonstrates efficacy in heavily pretreated populations
Adverse Events	Fatigue (15%), diarrhea (10%), mild bleeding	Favorable safety profile compared to irreversible BTK inhibitors

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2. Market Analysis of Pirtobrutinib

Market Overview and Shape

Segment	Estimated Market Size (2023)	Dynamics & Trends
Hematologic Malignancies	$12.3 billion	Increasing adoption of BTK inhibitors
Key Indications	MCL, CLL, WM	Growing respective patient populations
Competitive Approval Pathways	Accelerated/Breakthrough Designation	Expedite time-to-market for promising therapies

Key Competitive Landscape

Drug	Type	Mechanism	Approval Status	Market Share (2023)	Notes
Ibrutinib	Irreversible BTK inhibitor	Covalent binding	Approved (2013)	~45% (B-cell malignancies)	First-in-class
Acalabrutinib	Irreversible BTK inhibitor	Increased selectivity	Approved (2017)	~20%	Favorable safety profile
Zanubrutinib	Irreversible BTK inhibitor	Increased selectivity	Approved (2019)	~10%	Emerging competitor
Pirtobrutinib	Reversible BTK inhibitor	Non-covalent binding	Pending approval	Market entrant expected	Differentiation is key

Market Entry Drivers for Pirtobrutinib

• Resistance overcoming: Potential to treat patients refractory to covalent BTK inhibitors.
• Safety profile: Favorable adverse event profile, especially in older or comorbid patients.
• Expanding indications: Moving beyond MCL and CLL into other lymphoid malignancies.

Projected Market Growth (2023–2030)

Scenario	Compound Annual Growth Rate (CAGR)	Rationale
Conservative	15%	Based on current approvals and adoption rate
Optimistic	25%	With rapid approval, broad label expansion, and high efficacy

Key Drivers of Growth

Regulatory approvals expanding indications to other B-cell malignancies

Successful positioning in earlier lines of therapy

Patient preference for non-covalent, reversible agents

Competitive pricing strategies and insurance coverage

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3. Regulatory and Commercial Outlook

Regulatory Milestones

Anticipated Milesto	Expected Date	Details
Submission of New Drug Application (NDA)	2024 Q4	Based on Phase 2/3 data
Potential FDA/EMA Approval	2025 Q2	Conditional or standard approval
Breakthrough Therapy Designation	Granted (2022)	For specific indications

Commercial Strategies

• Target Early Adoption in R/R Populations: Focus on heavily pretreated patients with high unmet needs.
• Leverage Demonstrated Safety: Position as a safer alternative in populations at risk of adverse events.
• Insurance Coverage & Pricing: Competitive pricing aligned with existing BTK inhibitors, with leverage on real-world safety data.

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4. Comparative Analysis: Pirtobrutinib vs. Competitors

Attribute	Pirtobrutinib	Ibrutinib	Acalabrutinib	Zanubrutinib
Binding Mechanism	Non-covalent (reversible)	Covalent (irreversible)	Covalent	Covalent
Resistance Profile	Potentially effective against C481 mutations	Limited; resistance develops	Limited; resistance develops	Limited; resistance develops
Safety Profile	Favorable, fewer off-target effects	Atrial fibrillation, bleeding	Lower toxicity than Ibrutinib	Lower toxicity than Ibrutinib
Approved Markets	Present in CLL, WM, MCL	Multiple indications	Multiple indications	Multiple indications
Development Stage	Phase 3 pending approval	Approved	Approved	Approved

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5. Future Outlook and Strategic Opportunities

• Indication Expansion: Potential for use in other lymphoid malignancies and autoimmune conditions.
• Combination Therapies: Combining pirtobrutinib with BCL-2 inhibitors (e.g., venetoclax) or anti-CD20 monoclonal antibodies.
• Personalized Medicine: Biomarker-driven patient selection, especially for C481 mutation status.
• Manufacturing & Pricing: Optimization to maintain competitive advantage and accessibility.

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Key Takeaways

• Clinical Progress: Pirtobrutinib exhibits promising efficacy in late-stage trials, especially in heavily pretreated MCL and CLL patients. Its reversible binding mechanism may address resistance issues associated with covalent BTK inhibitors.
• Market Potential: The global BTK inhibitor market is poised for CAGR of approximately 15–25% through 2030, driven by expanding indications, high unmet needs, and therapeutic differentiation.
• Competitive Edges: Favorable safety profile, resistance mitigation capability, and late-stage trial progression position pirtobrutinib as a strategic entrant.
• Regulatory Outlook: Expected NDA submission in late 2024, with potential approval in 2025, contingent on positive trial outcomes.
• Strategic Focus: Effective positioning in refractory B-cell malignancy populations and proactive indication expansion are critical for capturing market share.

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Frequently Asked Questions (FAQs)

1. When is the expected approval date for pirtobrutinib?
Pending successful clinical trial results, regulatory submission is anticipated in late 2024, with potential approval around mid-2025.

2. How does pirtobrutinib's mechanism differ from other BTK inhibitors?
Pirtobrutinib is a reversible, non-covalent BTK inhibitor that binds BTK without requiring C481 covalent bonding, potentially overcoming resistance driven by C481 mutations.

3. What are the main safety advantages of pirtobrutinib?
Its high selectivity and reversible binding reduce off-target effects, leading to fewer adverse events like atrial fibrillation, bleeding, and diarrhea seen with earlier irreversible inhibitors.

4. Which indications are most promising for pirtobrutinib's market entry?
Initial focus on mantle cell lymphoma, chronic lymphocytic leukemia, and Waldenström's macroglobulinemia, with potential expansion into other B-cell malignancies.

5. What are the key competitive threats for pirtobrutinib?
Established irreversible BTK inhibitors like ibrutinib, acalabrutinib, and zanubrutinib, especially if they secure full approval and broaden indications.

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References

[1] Eli Lilly Press Release, 2022: "Pirtobrutinib Demonstrates Promising Clinical Benefits in Hematologic Malignancies."
[2] ClinicalTrials.gov, Pirtobrutinib Trials Catalog, 2023.
[3] Market Research Future, 2023: "Global BTK Inhibitors Market Analysis."
[4] FDA Labeling and Approvals, 2023.
[5] World Health Organization, Hematologic Malignancies Data, 2022.