Ozone Treatment in Paresthesia (numbness, Tingling) Secondary to Chemotherapy-induced Peripheral Neuropathy

Last updated: February 7, 2025
Sponsor: Bernardino Clavo, MD, PhD
Overall Status: Active - Recruiting

Phase

2/3

Condition

Pain (Pediatric)

Neurologic Disorders

Treatment

Ozone therapy

Oxygen (placebo)

Clinical Study ID

NCT06706544
OzoParQT
PI23/01324
2023-210-1
CIGC'23/24
2024-517196-20-00
CIGC2023/2024
  • Ages > 18
  • All Genders

Study Summary

The goal of this phase II/III randomized clinical trial is to evaluate the effect of adding rectal ozone therapy to the usual management of patients with paresthesia (numbness and/or tingling) due to chemotherapy-induced peripheral neuropathy (CIPN). Ozone treatment consists of the rectal insufflation of 180 - 300 milliliters of an ozone/oxygen gas mixture.

The main questions to answer are:

  1. Can ozone therapy improve patients' self-perceived level of numbness and tingling?

  2. Can ozone therapy improve patients' self-perceived health-related quality of life (HRQoL)?

In 42 patients with chronic numbness and tingling secondary to chemotherapy, the researchers will compare:

  • the addition of rectal ozone insufflations

  • versus the addition of rectal oxygen insufflations (placebo). Participants will receive 40 rectal gas (ozone versus oxygen) insufflations in 16 weeks and will continue other symptomatic or cancer treatments prescribed by their oncologists.

Before treatment, after treatment, and 12 weeks after treatment, they will be evaluated:

  • Several questionnaires about neuropathy, quality of life, and anxiety and depression.

  • Biochemical parameters of oxidative stress and inflammation

  • Hyperspectral images of hands and feet

  • Toxicity of procedure.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Adults > = 18 years old.
  1. Previous treatment with any chemotherapy because of any tumor.
  1. Clinical diagnosis of paresthesia (numbness, tingling) secondary to CIPN, withtoxicity Grade > = 2 (according to the Common Toxicity Criteria for AdverseEvents (CTCAE) from the National Cancer Institute of EEUU, v.5.0) for > = 3months.
  1. Without neurotoxic chemotherapy > = 3 months.
  1. Cancer disease is stable or in remission.
  1. Life expectancy > = 6 months.
  1. Before enrollment, women of childbearing potential should obtain a negativeresult in the serum or urine pregnancy test at the screening visit and acceptthe use of appropriate contraceptive methods at least from 14 days before thefirst ozone therapy session up to 14 days after the last one.
  1. To sign and date the study-specific informed consent

Exclusion

Exclusion Criteria:

  1. Age < 18 years.
  1. A woman who is lactating, pregnant, suspected of being pregnant, or a woman ofchildbearing potential who does not use adequate contraceptive methods.
  1. Suspected symptoms are due to diabetic or compressive neuropathy.
  1. Severe psychiatric disorders.
  1. Inability to complete the quality of life questionnaires.
  1. Elevation above 5 times the maximum limit of normal creatinine.
  1. Patient who is hemodynamic or clinically unstable or who requires urgent orshort-term interventional measures.
  1. Neoplasia in progression requiring recent initiation of systemic treatment ormaintenance with neurotoxic chemotherapy.
  1. Life expectancy (for any reason) < 6 months.
  1. Known allergy to ozone, known glucose 6 phosphate dehydrogenase (G6PD)deficiency, or hemochromatosis.
  1. Contraindications or impossibility for rectal ozone treatment or to attendregularly to the treatment.
  1. Not meeting each and every one of the inclusion criteria

Study Design

Total Participants: 42
Treatment Group(s): 2
Primary Treatment: Ozone therapy
Phase: 2/3
Study Start date:
February 07, 2025
Estimated Completion Date:
March 31, 2030

Study Description

Rationale Chemotherapy-induced peripheral neuropathy (CIPN) can lead to a decrease and/or interruption of chemotherapy treatment, limiting its efficacy and decreasing patients' quality of life. Therapeutic measures for CIPN are very limited in number and efficacy. Our previous experience has suggested the potential clinical usefulness of adjuvant treatment with ozone in patients with CIPN. The hypothesis of the trial is that ozone treatment will improve numbness and tingling symptoms in patients with CIPN.

Primary objectives:

To evaluate the effect of adding ozone to the usual management of patients with paresthesia (numbness and/or tingling) due to chemotherapy-induced peripheral neuropathy (CIPN), Grade 2 (moderate symptoms and/or limitation in instrumental activities of daily living) or higher, on:

  1. patients' self-perceived level of paresthesia

  2. patients' self-perceived health-related quality of life (HRQoL).

Secondary objectives:

To evaluate (in patients with numbness and/or tingling secondary to CIPN) the effect of adding ozone to the usual management on:

  1. the additional direct costs incurred in the application of ozone and evaluate the cost-effectiveness of the administration of ozone in these patients in comparison with the usual exclusive treatment.

  2. the evolution of the sensory neuropathy

  3. the evolution of the level of anxiety and depression,

  4. the evolution of biochemical parameters related to oxidative stress and chronic inflammation.

  5. the evolution of hyperspectral signatures obtained from hands and feet.

  6. to evaluate the toxicity of rectal ozone treatment in these patients.

Main trial endpoints.

  1. Percentage of change from baseline in "numbness and tingling" self-perceived by patients at the end of follow-up (week 28 after the commencement of ozone treatment)

  2. Change from baseline in "quality of life" (using the EQ-5D-5L questionnaire) self-perceived by patients at the end of follow-up (week 28 after the commencement of ozone treatment)

Secondary trial endpoints.

To evaluate the percentage of change from baseline in all the secondary objectives:

  • at the end of ozone treatment (weeks 16)

  • and at the end of follow-up (week 28)

Trial design. Phase II-III randomized triple-blind clinical trial. The duration of each patient in the study will be 28 weeks: 16 weeks of treatment and 12 weeks of follow-up. The planned total duration of the project is 60 months.

Trial population. 42 adult patients (>= 18 years old), with any tumor, with paresthesias (numbness and/or tingling) due to CIPN, grade of toxicity >= 2 (according to the Common Toxicity Criteria for Adverse Events (CTCAE) from the National Cancer Institute of EEUU, v.5.0), for >= 3 months.

Intervention.

All patients will receive the usual management and treatment for their symptoms + "40 sessions of rectal insufflation of O3/O2 gas mixture" in 16 weeks (3 or 2 sessions per week):

  • Ozone group, O3/O2 concentration increasing from 10 to 30 µg/mL (µg of O3 by mL of O2).

  • Control-placebo group, O3/O2 concentration = 0 µg/mL (this is: only O2).

Connect with a study center

  • Dr. Negrín University Hospital

    Las Palmas, 35019
    Spain

    Active - Recruiting

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