Study of SIR2501 in Solid Tumor Patients Receiving Paclitaxel

August 31, 2026 updated by: Sironax USA, Inc.

A Phase 2, Open-Label Study to Evaluate Safety, Tolerability, and Pharmacokinetics of SIR2501 and Its Potential to Address Paclitaxel-Induced Peripheral Neuropathy

This Phase 2, open-label study will evaluate the safety, tolerability, and pharmacokinetics of SIR2501 in adults with solid tumors who are scheduled to receive paclitaxel-based chemotherapy. The study will also explore whether SIR2501 has the potential to reduce the development of chemotherapy-induced peripheral neuropathy (CIPN).

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

SIR2501 will be administered to sequential cohorts at increasing dose levels. The study will characterize safety, pharmacokinetics, and preliminary signals related to neuropathy assessment in patients receiving paclitaxel.

Study Type

Interventional

Enrollment (Estimated)

18

Phase

  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • Maryland
      • Baltimore, Maryland, United States, 21287
        • Recruiting
    • New Jersey
      • East Brunswick, New Jersey, United States, 08816
        • Not yet recruiting

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Adults ≥18 years with confirmed solid tumors
  • Planned treatment with paclitaxel-based chemotherapy
  • ECOG performance status 0-2

Exclusion Criteria:

  • Pre-existing peripheral neuropathy
  • Conditions or medications that may interfere with neuropathy assessment
  • Prior exposure to neurotoxic chemotherapy
  • Use of medications known to mitigate CIPN
  • Significant medical conditions that may increase study risk

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 60 mg
Drug: SIR2501
Experimental: 30 mg SIR2501 administered at 30 mg dose level. Experimental: 45 mg SIR2501 administered at 45 mg dose level. Experimental: 60 mg SIR2501 administered at 60 mg dose level.
Experimental: 30 mg
Drug: SIR2501
Experimental: 30 mg SIR2501 administered at 30 mg dose level. Experimental: 45 mg SIR2501 administered at 45 mg dose level. Experimental: 60 mg SIR2501 administered at 60 mg dose level.
Experimental: 45 mg
Drug: SIR2501
Experimental: 30 mg SIR2501 administered at 30 mg dose level. Experimental: 45 mg SIR2501 administered at 45 mg dose level. Experimental: 60 mg SIR2501 administered at 60 mg dose level.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Primary Outcome
Time Frame: From first dose through 1 month after last dose
Incidence of Treatment-Emergent Adverse Events
From first dose through 1 month after last dose

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Secondary Outcome 1 - Pharmacokinetics: Cmax
Time Frame: From first dose through 1 month after last dose
Maximum Plasma Concentration (Cmax). Cmax of SIR2501 following oral administration
From first dose through 1 month after last dose
Secondary Outcome 2 - Pharmacokinetics: AUC
Time Frame: From first dose through 1 month after last dose
Area Under the Plasma Concentration-Time Curve (AUC₀-t). AUC₀-t of SIR2501 following oral administration
From first dose through 1 month after last dose
Secondary Outcome 3 - Neuropathy: EORTC QLQ CIPN20
Time Frame: From first dose through 1 month after last dose
Change from baseline in EORTC QLQ CIPN20 sensory subscale. Patient reported neuropathy symptoms using the validated EORTC QLQ CIPN20 questionnaire
From first dose through 1 month after last dose
Secondary Outcome 4 - Neuropathy: TNS/TNSc
Time Frame: From first dose through 1 month after last dose
Change from baseline in Total Neuropathy Score/Clinical Version (TNS/TNSc). Clinician rated neuropathy severity using TNS/TNSc
From first dose through 1 month after last dose
Secondary Outcome 6 - Neuropathy:
Time Frame: From first dose through 1 month after last dose
NCI CTCAE Grade NCI CTCAE v5.0 grade for CIPN. Clinician graded peripheral neuropathy severity
From first dose through 1 month after last dose
Secondary Outcome 7 - Pharmacodynamics: NfL
Time Frame: From first dose through 1 month after last dose
Change from baseline in blood neurofilament light chain (NfL) Description: Plasma NfL concentration measured by validated immunoassay
From first dose through 1 month after last dose

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sironax USA, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

August 21, 2026

Primary Completion (Estimated)

December 31, 2027

Study Completion (Estimated)

December 31, 2027

Study Registration Dates

First Submitted

July 31, 2026

First Submitted That Met QC Criteria

August 10, 2026

First Posted (Actual)

August 14, 2026

Study Record Updates

Last Update Posted (Actual)

September 1, 2026

Last Update Submitted That Met QC Criteria

August 31, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • SIR2501-GLB-201-CIPN

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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