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A Study of Lonitoclax (ZE50-0134) in Relapsed or Refractory B-cell Malignancies

NCT06708897 · Status: RECRUITING · Phase: PHASE1 · Type: INTERVENTIONAL · Enrollment: 84

Last updated 2026-07-31

No results posted yet for this study

Summary

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.

Conditions

  • CLL / SLL
  • CLL (Chronic Lymphocytic Leukemia)
  • SLL (Small Lymphocytic Lymphoma)
  • Marginal Zone Lymphoma(MZL)
  • Lymphoplasmacytic Lymphoma/Waldenström Macroglobulinemia

Interventions

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.

Sponsors & Collaborators

  • Lomond Therapeutics Holdings, Inc.

    lead INDUSTRY

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
SEQUENTIAL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-04-08
Primary Completion
2028-01-31
Completion
2028-07-31
FDA Drug
Yes

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT06708897 on ClinicalTrials.gov