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Testing the Safety of Anti-Cancer Drug, CX-5461 (Pidnarulex), in Treating Lymphoma With Specific Changes in the MYC Gene

Phase 1b/2 Trial of Pidnarulex in MYC Aberrant Lymphoma

Status
Recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07069699
Enrollment
50
Registered
2025-07-17
Start date
2026-10-13
Completion date
2030-01-31
Last updated
2026-04-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Burkitt Lymphoma, Double-Expressor Lymphoma, High Grade B-Cell Lymphoma With MYC and BCL2 and/or BCL6 Rearrangements

Brief summary

This phase Ib/II trial tests the safety, side effects, best dose and how well giving CX-5461 works for the treatment of patients with B-cell non-Hodgkin lymphoma. CX-5461 may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Giving CX-5461 may be safe, tolerable and/or effective in treating patients with B-cell non-Hodgkin lymphoma.

Detailed description

PRIMARY OBJECTIVES: I. To define dose limiting toxicity (DLT). (Phase 1) II. To assess toxicity profile. (Phase 1) III. To determine the recommended phase 2 dose (RP2D). (Phase 1) IV. To perform pharmacokinetic (PK) studies. (Phase 1) V. To examine the effect of CX-5461 (Pidnarulex) on gene expression profile of MYC aberrant lymphomas. (Phase 1) VI. To determine the objective response rate (ORR) (complete response \[CR\] and partial response \[PR\]). (Phase 2) SECONDARY OBJECTIVE: I. To observe and record anti-tumor activity. (Phase 1 and 2) EXPLORATORY OBJECTIVES: I. To determine the mechanisms of response and resistance using circulating tumor deoxyribonucleic acid (ctDNA). (Phase 1 and 2) II. To observe cerebral spinal fluid (CSF) distribution of CX-5461 (Pidnarulex). (Phase 1 and 2) OUTLINE: This is a phase 1 dose-escalation study of CX-5461 followed by a phase 2 study. Patients receive CX-5461 intravenously (IV) over 60 minutes on days 1 and 8 of each cycle. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients undergo lumbar puncture with cerebrospinal fluid (CSF) collection on study and positron emission tomography (PET) scan/computed tomography (CT) scan, tumor biopsy, and blood sample collection throughout the study. After completion of study treatment, patients are followed up at 30 days, every 3-4 months for the first 2 years, and every 6 months for years 3-5.

Interventions

PROCEDUREBiopsy Procedure

Undergo tumor biopsy

PROCEDUREBiospecimen Collection

Undergo CSF and blood sample collection

PROCEDUREComputed Tomography

Undergo PET/CT scan

PROCEDURELumbar Puncture

Undergo lumbar puncture

Given IV

PROCEDUREPositron Emission Tomography

Undergo PET/CT scan

Sponsors

National Cancer Institute (NCI)
Lead SponsorNIH

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Patients must have one of the following subtypes of aggressive B-cell non-Hodgkin lymphomas: double-expressor lymphoma (DEL), high-grade B-cell lymphoma (HGBL) with MYC and BCL2 and/or BCL6 rearrangement, or Burkitt lymphoma (BL). Eligible patients must have received at least two prior lines of treatment for diffuse large B-cell lymphoma (DLBCL) or at least one prior line of therapy for Burkitt Lymphoma and must have disease for which no standard curative or palliative treatment options exist or remain effective (Quin et al., 2016) * Age ≥ 18 years. Because no dosing or adverse event (AE) data are currently available on the use of CX-5461 (Pidnarulex) in patients \< 18 years of age, children are excluded from this study * Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2 (Karnofsky ≥ 60%). ECOG 3 is allowed if directly related to lymphoma per treating provider * Absolute neutrophil count ≥ 1,000/mcL * Platelets ≥ 50,000/mcL * Total bilirubin ≤ 1.5 institutional upper limit of normal (ULN) * Patients with documented Gilbert's syndrome may be included if total bilirubin is ≤ 3 × ULN and direct bilirubin is within normal limits * Aspartate aminotransferase (AST)(serum glutamic oxaloacetic transaminase \[SGOT\])/ alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase \[SGPT\]) ≤ 3 × institutional upper limit of normal (ULN) * Glomerular filtration rate (GFR) ≥ 60 mL/min/, calculated by multiplying the estimated (e)GFR (mL/min/1.73 m\^2) by the individual's body surface area (BSA, calculated using an accepted formula) and dividing by 1.73 m\^2 * Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial * For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated * Patients with a history of hepatitis C virus (HCV) infection must have been treated and cured. For patients with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load * Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial * Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association Functional Classification. To be eligible for this trial, patients should be class II or better * Patients with cytopenia related to abnormal bone marrow function in the setting of bone marrow involvement with lymphoma or post chimeric antigen receptor (CAR) T-cell are allowed to enroll if deemed safe by treating provider * Patients without clinical evidence of central nervous system (CNS) lymphoma * The effects of CX-5461 (Pidnarulex) on the developing human fetus are unknown. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control or abstinence) 14 days prior to study entry and for the duration of study participation and for at least 6 months after the last dose of study drug. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Women should not breastfeed while taking CX-5461 (Pidnarulex) and for 6 months after cessation of treatment. Men treated or enrolled on this protocol must also agree to use adequate contraception 14 days prior to the study, for the duration of study participation, and 6 months after completion of CX-5461 (Pidnarulex) administration. Women of childbearing age should not donate egg(s) and men should not donate sperm for the duration of study participation and 6 months after completion of the last dose CX-5461 (Pidnarulex) * Willingness to provide blood and biopsy samples for research purposes * Ability to understand and the willingness to sign a written informed consent document

Exclusion criteria

* Patients must have recovered from clinically significant adverse events (AEs) of their most recent cancer immunotherapy to grade 1 or less (with the exception for alopecia or lymphopenia) * Eligibility of subjects receiving any medications or substances known to affect or with the potential to affect the activity of CX-5461 (Pidnarulex) will be determined based on their potential to interact with the CYP3A4 isozyme. Specifically, subjects taking strong CYP3A4 inhibitors or strong CYP3A4 inducers will be excluded from participation in the trial. For medications or substances not listed, or in cases of uncertainty, the Principal Investigator may consult with a medical expert or a pharmacologist to make an informed decision regarding eligibility * Patients with a baseline corrected QT (QTc) interval \> 480 msec * Patients who are receiving any other investigational agents * History of allergic reactions attributed to compounds of similar chemical or biologic composition to CX-5461 (Pidnarulex) * Patients with uncontrolled intercurrent illness or any other significant condition(s) that would make participation in this protocol unreasonably hazardous * Pregnant women are excluded from this study because CX-5461 (Pidnarulex) is an agent with the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk for AEs in nursing infants secondary to treatment of the mother with CX-5461 (Pidnarulex), breastfeeding should be discontinued if the mother is treated with CX-5461 (Pidnarulex)

Design outcomes

Primary

MeasureTime frameDescription
Incidence of adverse events (Phase 1)Up to 30 days after last dose of study treatmentAssessed by the Common Terminology Criteria for Adverse Events version 5. Safety will be summarized overall, by actual dose level in Phase 1b.
Recommended phase 2 dose (RP2D) (Phase 1)Up to 5 years
Pharmacokinetic (PK) levels (Phase 1)At cycle (C) 1 day (D) 8 at pre-dose, end of infusion, and 2 hours (hrs) post-dose; on C1D9 at 24 hrs post C1D8 infusion; on C1D10 at 48 hrs post C1D8 infusion; on C1D11 at 72 hrs post C1D8 infusion; and on C1D15 at 167 hrs post C1D8 infusionAssessed using Liquid Chromatography Mass Spectrometry (LC-MS).
Gene expression (Phase 1)At baseline, C1D9 or C1D10 (within 24-48 hrs of C1D8 dosing),and at progressionAssessed by ribonucleic acid sequencing complemented by whole exome sequencing using an average absolute log2 fold change relative to baseline with a significance threshold of p \< 0.05.
Overall response rate (Phase 2)Up to 5 yearsAssessed using standard radiographic criteria according to Lugano criteria. Phase 2 results will be reported at the RP2D.

Secondary

MeasureTime frameDescription
Response to therapy (Phase 1 and 2)Up to 5 yearsAssessed according to Lugano criteria.

Countries

United States

Contacts

PRINCIPAL_INVESTIGATORSami Ibrahimi

Yale University Cancer Center LAO

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Apr 4, 2026