Lisaftoclax Plus Pirtobrutinib in Relapsed or Refractory Mantle Cell Lymphoma After BTK-Targeted Therapy

NCT07684950 | Not Yet Recruiting Phase 2

• 1 other identifier: 2026-204
• Study Type: interventional
• Target: 45
• Locations: 1 country
• Sites: 1

Brief Summary

This prospective, open-label, phase 2 study will evaluate the efficacy and safety of lisaftoclax in combination with pirtobrutinib in adults with relapsed or refractory mantle cell lymphoma following failure of prior BTK-targeted therapy. The study includes two cohorts. Cohort 1 will enroll participants who experienced stable disease, disease progression, or intolerance following treatment with a covalent BTK inhibitor. Cohort 2 is an exploratory cohort enrolling participants who experienced stable disease, disease progression, or intolerance following treatment with a non-covalent BTK inhibitor other than pirtobrutinib or a BTK degrader. Participants will receive oral pirtobrutinib 200 mg once daily in combination with oral lisaftoclax. Lisaftoclax will be administered using a dose ramp-up schedule, followed by a target dose of 600 mg once daily. Treatment will continue until disease progression, unacceptable toxicity, withdrawal of consent.

Conditions

Mantle Cell Lymphoma (MCL)

Keywords

Relapsed Mantle Cell Lymphoma; Refractory Mantle Cell Lymphoma; BTK Inhibitor; BCL-2 Inhibitor; Non-Covalent BTK Inhibitor; Lisaftoclax; Pirtobrutinib

Outcome Measures

Primary Outcomes (2)

• Complete Response Rate at 6 Months in Cohort 1

  The proportion of participants in Cohort 1 who achieve a complete response at 6 months after initiation of study treatment, as assessed by the investigator according to the Lugano 2014 response criteria.

  At 6 months after initiation of study treatment

• Overall Response Rate in Cohort 2

  The proportion of participants in Cohort 2 who achieve a best overall response of complete response or partial response, as assessed by the investigator according to the Lugano 2014 response criteria.

  From the first dose of study treatment until disease progression, assessed up to 36 months

Secondary Outcomes (5)

• Duration of Response

  From the first documented response until disease progression or death, whichever came first, assessed up to 36 months

• Progression-Free Survival

  From the first dose of study treatment until disease progression or death, whichever came first, assessed up to 36 months

• Overall Survival

  From the first dose of study treatment until death from any cause, assessed up to 36 months

• Minimal Residual Disease Negativity Rate

  At baseline, assessed up to 4 weeks. Interim response assessment, from the first dose of study treatment till 3 cycles. End of induction treatment, from the first dose of study treatment till 3 cycles. Following period, every 6 months during follow-up.

• Number of Participants With Treatment-Emergent Adverse Events

  From the first dose of study treatment through 30 days after the last dose

Study Arms (2)

Cohort 1: Prior Covalent BTK Inhibitor Therapy

EXPERIMENTAL

Participants with relapsed or refractory mantle cell lymphoma who experienced stable disease, disease progression, or intolerance following prior treatment with at least one covalent BTK inhibitor will receive lisaftoclax in combination with pirtobrutinib.

Drug: Lisaftoclax; Drug: Pirtobrutinib

Cohort 2: Prior Non-Covalent BTK Inhibitor or BTK Degrader Therapy

EXPERIMENTAL

Participants with relapsed or refractory mantle cell lymphoma who experienced stable disease, disease progression, or intolerance following prior treatment with a non-covalent BTK inhibitor other than pirtobrutinib or a BTK degrader will receive lisaftoclax in combination with pirtobrutinib.

Drug: Lisaftoclax; Drug: Pirtobrutinib

Interventions

Lisaftoclax DRUG

Lisaftoclax will be administered orally once daily. During Cycle 1, participants will undergo dose ramp-up with 20 mg on Day 1, 50 mg on Day 2, 100 mg on Day 3, 200 mg on Day 4, and 400 mg on Day 5. The target dose of 600 mg once daily will begin on Day 6 and continue thereafter. Each treatment cycle is 28 days. Treatment will continue until disease progression, unacceptable toxicity, withdrawal of consent, or another protocol-defined reason for discontinuation.

Cohort 1: Prior Covalent BTK Inhibitor Therapy; Cohort 2: Prior Non-Covalent BTK Inhibitor or BTK Degrader Therapy

Pirtobrutinib DRUG

Pirtobrutinib will be administered orally at a dose of 200 mg once daily beginning on Day 1 of Cycle 1. Each treatment cycle is 28 days. Treatment will continue until disease progression, unacceptable toxicity, withdrawal of consent, or another protocol-defined reason for discontinuation.

Cohort 1: Prior Covalent BTK Inhibitor Therapy; Cohort 2: Prior Non-Covalent BTK Inhibitor or BTK Degrader Therapy

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Participants must meet all of the following criteria:
• Age 18 years or older.
• Histologically and immunophenotypically confirmed mantle cell lymphoma.
• At least one measurable lesion.
• Received at least one prior systemic treatment regimen that included a BTK-targeted therapy, including a covalent BTK inhibitor, non-covalent BTK inhibitor, or BTK degrader, and had stable disease, disease progression, or intolerance during or after the most recent BTK-targeted therapy.
• Eastern Cooperative Oncology Group performance status of 0 to 2.
• Adequate hepatic, renal, and bone marrow function, defined as all of the following:
• \* Aspartate aminotransferase and alanine aminotransferase ≤3 × upper limit of normal;
• Total bilirubin ≤1.5 × upper limit of normal;
• Creatinine clearance ≥30 mL/min;
• Absolute neutrophil count ≥0.5 × 10\^9/L;
• Platelet count ≥30 × 10\^9/L. Supportive treatment is permitted.
• Participants of reproductive potential must agree to use effective contraception during study treatment and for 3 months after the last dose of study treatment.
• Willing and able to comply with study procedures and follow-up assessments.
• Able to understand and voluntarily sign the informed consent form before screening.

You may not qualify if:

• \. Known hypersensitivity to pirtobrutinib, lisaftoclax, or any component or excipient of either study drug.
• \. Concurrent participation in another clinical study. 3. Prior treatment with any BCL-2 inhibitor. 4. Active central nervous system involvement, including parenchymal or leptomeningeal disease.
• \. Clinically significant uncontrolled cardiac or cardiovascular disease, or a history of myocardial infarction within 6 months before the planned initiation of pirtobrutinib.
• \. Uncontrolled active severe systemic bacterial, viral, fungal, or parasitic infection.
• \. Current treatment with strong CYP3A4 inhibitors or inducers and/or strong P-glycoprotein inhibitors.
• \. Positive human immunodeficiency virus test. 9. Active hepatitis B or hepatitis C infection, except:
• Participants with detectable hepatitis B virus DNA whose disease is controlled may be enrolled at the investigator's discretion, provided that concurrent antiviral therapy is administered;
• Participants with a history of hepatitis C virus infection who have completed antiviral treatment and have a viral load below the lower limit of quantification may be enrolled.
• \. Pregnant or breastfeeding women. 11. Unable to complete protocol-required study visits or procedures, including follow-up visits, or unable to comply with study requirements.
• \. Any other clinically significant current or prior medical condition that, in the investigator's judgment, may pose a risk to participant safety or interfere with study assessments, procedures, or completion.

Sponsors & Collaborators

• Henan Cancer Hospital: lead

Study Sites (1)

Henan Cancer Hospital

Zhengzhou, Henan, China

Location

MeSH Terms

Conditions

Lymphoma, Mantle-Cell

Interventions

Lisaftoclax; pirtobrutinib

Condition Hierarchy (Ancestors)

Lymphoma, Non-Hodgkin; Lymphoma; Neoplasms by Histologic Type; Neoplasms; Lymphoproliferative Disorders; Lymphatic Diseases; Hemic and Lymphatic Diseases; Immunoproliferative Disorders; Immune System Diseases

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER GOV
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Doctor

Study Record Dates

• First Submitted: June 17, 2026
• First Posted: July 6, 2026
• Study Start: June 30, 2026
• Primary Completion (Estimated): October 30, 2028
• Study Completion (Estimated): April 30, 2029
• Last Updated: July 6, 2026

Record last verified: 2026-06

Data Sharing

• IPD Sharing: Will not share

Locations

CN (1)