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Pirtobrutinib and rituximab

Phase 2

Mantle Cell Lymphoma (MCL) | Small molecule | Oncology |Eli Lilly and Company|Last Updated: Dec 16, 2025

Target and mechanism

Molecular targetBTK
Target classInhibitor
ModalitySmall molecule

Also known as Pirtobrutinib

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment50

FDA Designations

No designations recorded

Clinical trial landscape

Pirtobrutinib and rituximab · 1 trial · 1 indication

Phase 2 1
NCT07285590Clinical Trial to Evaluate the Efficacy and Safety of Pirtobrutinib With Rituximab in Patients With Mantle Cell LymphomaMantle Cell Lymphoma (MCL)
RECRUITING50 Analytics
PHASE2RECRUITING
Clinical Trial to Evaluate the Efficacy and Safety of Pirtobrutinib With Rituximab in Patients With Mantle Cell Lymphoma
Mantle Cell Lymphoma (MCL)Unlock trial analytics

Study Endpoints

Primary Endpoints

Efficacy of Pirtobrutinib in combination with rituximab after 6 cycles
At the end of Cycle 6 (each cycle is 28 days)

To assess the activity of Pirtobrutinib in combination with rituximab (P-R) as a therapeutic alternative to immunochemotherapy (R-Bendamustine or R-CHOP regimen) in patients with an indolent clinical presentation of MCL. The primary objective will be assessed by the complete remission rate (CRR), defined as the percentage of patients who achieve a complete response (CR) at the end of Cycle 6 of the P-R combination according to the Lugano Classification.

Secondary Endpoints

To evaluate the activity of Pirtobrutinib-Rituximab combination along time in terms of ORR
At month 6, month 12 and month 24.
Evaluation of MRD
After cycle 6, cycle 12, cycle 30, cycle 36, cycle 42, cycle 48 (each cycle is 28 days), and End of treatment (28 days after las administration of Study drug).
To determine the safety and tolerability of P-R combination
Baseline, during all the cycles day 1 visit (each cycle is 28 days) and at EoT (28 days afert las administration of Study drug).
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Pirtobrutinib with rituximabEXPERIMENTALPatients will receive a P-R combination for at least 24 cycles (C24). The first cycle of P-R will be administered at day 1 (baseline) . Pirtobrutinib discontinuation will be decided after C24, according to the MRD response and the TP53 mutational status. Rituximab treatment will end up at C23.

Interventions

NameTypeDescription
Pirtobrutinib and rituximabDRUGPatients will receive the study treatment (P-R combination) at day 1 (baseline) and during the treatment period (C24). Pirtobrutinib discontinuation per protocol will be decided after C24, according to the MRD response and the TP53 mutational status. Rituximab treatment will end up at C23.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites16

Inclusion Criteria: 1. Adult patients (≥18 years of age). 2. Written informed consent must be obtained before any study-specific assessment is performed. 3. Subjects with confirmed diagnosis of Mantle Cell Lymphoma according to the International Consensus Classification, (ICC) 2022\] or World Healt...

Countries:PortugalSpain
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Frequently asked questions about Pirtobrutinib and rituximab

What is Pirtobrutinib used for?

Pirtobrutinib is an investigational small molecule being studied for Waldenstrom Macroglobulinemia, Mantle Cell Lymphoma, Marginal Zone Lymphoma, Non-Hodgkin Lymphoma, and other B-cell malignancies. It is also being evaluated in healthy volunteers. The drug is in Phase 3 clinical development for these oncology indications.

What does Pirtobrutinib target?

Pirtobrutinib is a kinase inhibitor, as indicated by its -tinib suffix. It is being developed to treat B-cell malignancies including Waldenstrom Macroglobulinemia and Mantle Cell Lymphoma. The drug is administered orally and is currently in Phase 3 clinical trials.

Who makes Pirtobrutinib?

Pirtobrutinib is being developed by Eli Lilly and Company, which trades on the NYSE under the ticker LLY. The company is conducting Phase 3 trials of the drug in multiple oncology indications, including chronic lymphocytic leukemia and small lymphocytic lymphoma.

What phase is Pirtobrutinib in?

Pirtobrutinib is in Phase 3 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The drug is being studied in multiple Phase 3 trials for B-cell malignancies, including chronic lymphocytic leukemia and small lymphocytic lymphoma.

What clinical trials is Pirtobrutinib in?

Pirtobrutinib is being studied in several Phase 3 trials, including NCT04666038 comparing it to idelalisib plus rituximab or bendamustine plus rituximab in previously treated CLL/SLL, and NCT04965493 testing it with venetoclax and rituximab versus venetoclax and rituximab alone. A Phase 1 trial, NCT03740529, has been completed.

Is Pirtobrutinib the same as Pirtobrutinib and rituximab?

Pirtobrutinib and rituximab is a combination regimen being studied in clinical trials, not an alternative name for the single drug Pirtobrutinib. The combination is being evaluated in Phase 3 trials for chronic lymphocytic leukemia and small lymphocytic lymphoma.