Study of PCLX-001 in R/R Advanced Solid Malignancies and B-cell Lymphoma

Phase I Trial of PCLX-001 in Relapsed/Refractory B-cell Non-Hodgkin Lymphoma and Advanced Solid Malignancies

This is a phase I dose-escalation study of oral PCLX-001, conducted in a multicenter, non-randomized, open-label, non-controlled design. The study is comprised of two parts: Part A (single-agent dose escalation) and Part B (single-agent expansion cohorts).

Study Overview

• Status: Completed
• Conditions: Advanced Solid Tumor; B-cell Non Hodgkin Lymphoma
• Intervention / Treatment: Drug: PCLX-001 - 20mg; Drug: PCLX-001 - 40mg; Drug: PCLX-001 - 70mg; Drug: PCLX-001 - 100mg; Drug: PCLX-001 - 140mg; Drug: PCLX-001 - 210mg; Drug: PCLX-001 - 280mg

Detailed Description

This is a phase I dose-escalation study of oral PCLX-001, conducted in a multicenter, non-randomized, open-label, non-controlled design. The study is comprised of two parts: Part A (single-agent dose escalation) and Part B (single-agent expansion cohorts).

For Part A dose-escalation, patients will be enrolled in cohorts of 3 to 6 patients to each dose level. A new dose level cannot open to accrual until toxicity has been determined in the preceding dose level (i.e. all patients have completed their first cycle of therapy and data for all patients in that dose level have been reviewed at a safety cohort review meeting). Six patients will be treated at the maximum tolerated dose (MTD) and/or recommended phase II dose (RP2D). If required, the MTD cohort may be expanded by an additional 10 patients for further toxicity and response assessment. The MTD cohort expansion may be restricted to B-cell lymphoma or advanced solid tumours to ensure there is proper distribution during dose escalation.

For Part B (single agent expansion cohorts), two expansion cohorts (N=20 each) will be opened to determine the preliminary clinical activity of PCLX-001 at the RP2D:

• Expansion Cohort A: Participants with advanced solid malignancies showing preclinical sensitivity or molecular markers of sensitivity to PCLX-001. This includes breast, nonsmall cell lung (NSCLC), small-cell lung (SCLC), colorectal (CRC), and bladder cancers
• Expansion Cohort B: Participants with relapsed/refractory (R/R) B-cell lymphoma: diffuse large B-cell lymphoma (DLBCL), high grade B-cell lymphoma (HGBL), follicular lymphoma (FL), mantle cell lymphoma (MCL), and Burkitt lymphoma. Transformed large B-cell lymphoma will also be included.

• Study Type: Interventional
• Enrollment (Actual): 29
• Phase: Phase 1

Contacts and Locations

Study Locations

• Canada
  • Alberta
    • Edmonton, Alberta, Canada, T6G 1Z2
      • Cross Cancer Institute
  • British Columbia
    • Vancouver, British Columbia, Canada, V5Z4E6
      • BC Cancer - Vancouver
  • Ontario
    • Toronto, Ontario, Canada, M5G 2M9
      • Princess Margaret Hospital
  • Quebec
    • Montréal, Quebec, Canada, H2X 0A9
      • CR Centre Hospitalier de l'Université de Montréal - CHUM

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 14 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Ability to understand and the willingness to sign a written informed consent. A signed informed consent must be obtained before any study-specific procedures are performed.
2. Male or female patients aged ≥ 18 years

3. Dose Escalation

   1. Participants with histologically-confirmed advanced solid tumor who have failed at least one prior therapy and/or are not eligible for therapies expected to provide clinical benefit.
   2. Histologically-confirmed B-cell lymphomas that are expected to express CD20 including DLBCL, HGBL, FL (grades 1 to 3b), MCL, and Burkitt lymphoma who have failed at least two prior therapies and/or are not eligible for therapies expected to provide clinical benefit (including autologous stem cell transplantation). Transformed large B-cell lymphoma patients are eligible. FL patients should meet criteria for requiring treatment.

   Dose Expansion Cohort A: Participants with histologically-confirmed advanced breast, NSCLC, SCLC, colorectal, and bladder cancers who have failed at least one prior therapy and/or are not eligible for therapies expected to provide clinical benefit.

   Cohort B: Participants with histologically-confirmed R/R B-cell lymphomas that are expected to express CD20 including DLBCL, HGBL, FL (grades 1-3a), FL (grade 3b), MCL, and Burkitt lymphoma who have failed at least two prior therapies and/or are not eligible for therapies expected to provide clinical benefit. Transformed large B-cell lymphoma patients are eligible. FL patients should meet criteria for requiring treatment.

4. Patients must have evaluable or measurable disease.
5. Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1.
6. Life expectancy of at least 12 weeks
7. Patients must have adequate bone marrow, liver, kidney and cardiac function.
8. Patients must have adequate coagulation.
9. Women of childbearing potential must have a negative pregnancy test.
10. Women of childbearing potential and fertile men must agree to use adequate contraception when sexually active from signing of the informed consent form for the full study until at least 6 months after the last study drug administration.

Exclusion Criteria:

1. Known hypersensitivity to the study drugs or excipients of the preparations or any agent given in association with this study.
2. History of cardiac disease: congestive heart failure New York Heart Association (NYHA) class > II, unstable angina (angina symptoms at rest), new-onset angina (within the past 6 months before study entry), myocardial infarction within the past 6 months before study entry, or uncontrolled cardiac arrhythmias.
3. Uncontrolled arterial hypertension despite optimal medical management.
4. Moderate or severe hepatic impairment.
5. Patients with known human immunodeficiency virus (HIV) infection.
6. Patients who have an active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection requiring treatment.
7. Infections not responding to therapy or active clinically serious infections.
8. Symptomatic metastatic brain or meningeal tumors unless the patient is > 3 months from definitive therapy, has a stable imaging study and is clinically stable. Patients with asymptomatic brain metastases must not be on steroid therapy.
9. Current or past history of central nervous system (CNS) lymphoma.
10. Uncontrolled seizure disorder requiring therapy.
11. History of organ allograft transplantation or autologous stem cell transplantation ≤ 3 months prior to the first dose of study drug. Patients who received prior CAR-T or other T-cell targeting treatment (approved or investigational) ≤ 4 weeks prior to study drug administration.
12. Evidence or history of bleeding disorder within 4 weeks before the first dose of study drug.
13. Serious, non-healing wound, ulcer, or bone fracture.
14. Any malabsorption condition.
15. Breastfeeding. Female patients must not breastfeed during treatment and until 4 months after last study drug administration.
16. Treatment with systemic steroids (prednisone dose ≥10 mg/day or equivalent dose).
17. Acute toxic effects of previous anticancer chemotherapy or immunotherapy that have not yet stabilized or if significant post-treatment toxicities have been observed.
18. Radiotherapy for target lesions during study or within 3 weeks before the first dose of study drug.
19. Major surgery or significant trauma within 4 weeks before the first dose of study drug.
20. Concomitant participation in another clinical study with investigational medicinal product(s).
21. Substance abuse, medical, psychological, or social conditions that may interfere with the patient's participation in the study or evaluation of the study results.
22. Use of strong CYP3A4 inhibitors and inducers from 14 days prior to first administration of study drug. Strong CYP3A4 inhibitors and inducers are prohibited during the study and until the active follow up visit.
23. Clinically relevant findings in the ECG.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

7

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: PCLX-001 intervention 20mg; Cohort 1: Participants were administered 20mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 20mg; 20mg daily oral pills; Other Names: zelenirstat
Experimental: PCLX-001 intervention 40mg; Cohort 2: Participants were administered 40mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 40mg; 40mg daily oral pills; Other Names: zelenirstat
Experimental: PCLX-001 intervention 70mg; Cohort 3: Participants were administered 70mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 70mg; 70mg daily oral pills; Other Names: zelenirstat
Experimental: PCLX-001 intervention 100mg; Cohort 4: Participants were administered 100mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 100mg; 100mg daily oral pills; Other Names: zelenirstat
Experimental: PCLX-001 intervention 140mg; Cohort 5: Participants were administered 140mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 140mg; 140mg daily oral pills; Other Names: zelenirstat
Experimental: PCLX-001 intervention 210mg; Cohort 6: Participants were administered 210mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 210mg; 210mg daily oral pills; Other Names: zelenirstat
Experimental: PCLX-001 intervention 280mg; Cohort 7: Participants were administered 280mg of PCLX-001 orally as continuous daily dosing on a 28-day cycle.	Drug: PCLX-001 - 280mg; 280mg daily oral pills; Other Names: zelenirstat

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
To Determine, During the Dose Escalation Phase, the Recommended Dose of PCLX-001 for the Dose Expansion Phase of the Trial.	The recommended dose will be the dose level below that for the cohort in which maximum tolerated dose (MTD) was reached/exceeded. MTD will have been reached when 2 or more patients in a cohort experience DLT.	Through study completion, an average of ~90 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
To evaluate the clinical response rate in patients treated with PCLX-001 with advanced solid malignancies	Tumor response and progression of solid tumors and NHL will be evaluated by the investigator at each study center	Tumor measurements and NHL for efficacy evaluation will be made at initiation and at the end of every 2nd cycle (each cycle is 28 days)

Other Outcome Measures

Outcome Measure	Measure Description	Time Frame
Assess the pharmacodynamic (PD) effects of PCLX-001 in patients with B-cell lymphomas	Collection of blood samples for exploratory biomarker research is also a part of this trial. Specimens will be stored and may be used for research purposes to identify biomarkers useful for predicting and monitoring PCLX-001.	Measured during every cycle (Cycles 1, 2, 3, 4, etc.) of treatment (Cycle length is 28 days)

Collaborators and Investigators

• Sponsor: Pacylex Pharmaceuticals
• Collaborators: Ozmosis Research Inc.
• Investigators: Principal Investigator: Randeep Sangha, Cross Cancer Institute

Publications and helpful links

General Publications

• Beauchamp E, Yap MC, Iyer A, Perinpanayagam MA, Gamma JM, Vincent KM, Lakshmanan M, Raju A, Tergaonkar V, Tan SY, Lim ST, Dong WF, Postovit LM, Read KD, Gray DW, Wyatt PG, Mackey JR, Berthiaume LG. Targeting N-myristoylation for therapy of B-cell lymphomas. Nat Commun. 2020 Oct 22;11(1):5348. doi: 10.1038/s41467-020-18998-1.
• Sangha R, Jamal R, Spratlin J, Kuruvilla J, Sehn LH, Beauchamp E, Weickert M, Berthiaume LG, Mackey JR. A first-in-human phase I trial of daily oral zelenirstat, a N-myristoyltransferase inhibitor, in patients with advanced solid tumors and relapsed/refractory B-cell lymphomas. Invest New Drugs. 2024 Aug;42(4):386-393. doi: 10.1007/s10637-024-01448-w. Epub 2024 Jun 5.

Study record dates

Study Major Dates

• Study Start (Actual): September 14, 2021
• Primary Completion (Actual): October 28, 2024
• Study Completion (Actual): October 28, 2024

Study Registration Dates

• First Submitted: March 29, 2021
• First Submitted That Met QC Criteria: April 2, 2021
• First Posted (Actual): April 8, 2021

Study Record Updates

• Last Update Posted (Actual): April 17, 2025
• Last Update Submitted That Met QC Criteria: April 1, 2025
• Last Verified: March 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms; Immune System Diseases; Neoplasms by Histologic Type; Lymphatic Diseases; Lymphoproliferative Disorders; Immunoproliferative Disorders; Lymphoma; Lymphoma, B-Cell; Lymphoma, Non-Hodgkin
• Other Study ID Numbers: PCLX-001-01

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Study Data/Documents

1. Study Protocol
2. Informed Consent Form

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No