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Léčba ozonem u parestézie (necitlivost, mravenčení) sekundární k chemoterapii indukované periferní neuropatii: RCT. (OzoParQT)

15. září 2026 aktualizováno: Bernardino Clavo, MD, PhD

Účinnost a nákladová efektivita léčby ozonem u pacientů s parestezií (necitlivost, mravenčení) sekundární k periferní neuropatii vyvolané chemoterapií. Randomizovaná, trojitě slepá klinická studie (OzoParQT).

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.

Přehled studie

Postavení

Nábor

Podmínky

Intervence / Léčba

Detailní popis

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).

Typ studie

Intervenční

Zápis (Odhadovaný)

42

Fáze

  • Fáze 2
  • Fáze 3

Kontakty a umístění

Tato část poskytuje kontaktní údaje pro ty, kteří studii provádějí, a informace o tom, kde se tato studie provádí.

Studijní kontakt

Studijní záloha kontaktů

  • Jméno: Francisco Rodríguez-Esparragón, BSc, PhD
  • Telefonní číslo: 34928449288
  • E-mail: afrodesp@gmail.com

Studijní místa

    • Las Palmas
      • Las Palmas, Las Palmas, Španělsko, 35019
        • Nábor
        • Dr. Negrín University Hospital
        • Kontakt:
        • Kontakt:
          • Francisco Rodríguez-Esparragón, BSc, PhD
          • Telefonní číslo: 34928449288
          • E-mail: afrodesp@gmail.com
        • Vrchní vyšetřovatel:
          • Bernardino Clavo, MD, PhD
        • Vrchní vyšetřovatel:
          • Francisco Rodríguez-Esparragón, BSc, PhD

Kritéria účasti

Výzkumníci hledají lidi, kteří odpovídají určitému popisu, kterému se říká kritéria způsobilosti. Některé příklady těchto kritérií jsou celkový zdravotní stav osoby nebo předchozí léčba.

Kritéria způsobilosti

Věk způsobilý ke studiu

18 let a starší (Dospělý, Starší dospělý)

Přijímá zdravé dobrovolníky

Ne

Pohlaví způsobilá ke studiu

Všechno

Popis

Inclusion Criteria:

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

Exclusion Criteria:

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

Studijní plán

Tato část poskytuje podrobnosti o studijním plánu, včetně toho, jak je studie navržena a co studie měří.

Jak je studie koncipována?

Detaily designu

  • Primární účel: Léčba
  • Přidělení: Randomizované
  • Intervenční model: Paralelní přiřazení
  • Maskování: Trojnásobný

Zbraně a zásahy

Skupina účastníků / Arm
Intervence / Léčba
Experimentální: Ozone Group

Drug: Ozone (O3/O2). Treatment: Usual treatment + Ozone therapy by rectal insufflation. O3/O2 concentration progressively increased from 10 to 30 μg/ml; 40 sessions in 16 weeks.

Usual treatment (by their oncologist or hematologist) + Ozone therapy by rectal insufflation. O3/O2 concentration progressively increased from 10 to 30 μg/ml; 40 sessions in 16 weeks.

Ostatní jména:
  • O3
  • Ošetření ozonem
  • Směs plynů O3/O2
Komparátor placeba: Oxygen Group (Placebo)

Drug: Oxygen (O2). Treatment: Usual treatment + Oxygen by rectal insufflation. O3/O2 concentration = 0 μg/ml (only O2); 40 sessions in 16 weeks.

Usual treatment (by their oncologist or hematologist) + Oxygen by rectal insufflation. O3/O2 concentration = 0 μg/ml (only O2); 40 sessions in 16 weeks.

Ostatní jména:
  • O2

Co je měření studie?

Primární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
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)
Časové okno: 28 weeks

Self-reported evaluation of the percentage of "numbness and/or tingling" regarding the basal level. From 100% (basal level, 0% improvement) to 0% (no numbness and tingling, 100% improvement).

28 weeks
Change from Baseline in quality of life by the EQ-...
Časové okno: 28 weeks

Self-reported evaluation of: a) 5 physical and emotional items scored in five levels, from 1 (Best: I have no problem) to 5 (worst: I have an extreme problem or I am unable to…) and b) additional self-assessment of health by a visual analog scale (0 = worst health patient can imagine, 100 = best health patient can imagine).

28 weeks

Sekundární výstupní opatření

Měření výsledku
Popis opatření
Časové okno
Direct hospital costs
Časové okno: 28 weeks

The direct expenses incurred by the hospital in providing services (medication, tests, medical visits…) during the 28 weeks for the study (in euros).

28 weeks
Change from baseline in "numbness and tingling" self-perceived by patients at the end of ozone treatment.
Časové okno: 16

Self-reported evaluation of the percentage of "numbness and/or tingling" regarding the basal level. From 100% (basal level, 0% improvement) to 0% (no numbness and tingling, 100% improvement).

16
Changes from baseline in the Grade of toxicity of parestesias (numbness, tingling) according to the CTCAE v.5.0. scale at the end of ozone treatment.
Časové okno: 16 weeks

Changes from baseline in the Grade of toxicity of paresthesias (numbness, tingling) according to the CTCAE v.5.0. scale (from the National Cancer Institute of EEUU). Range from: Grade = (asymptomatic or mild symptoms) to Grade 3 (severe symptoms, limiting self-care activities in daily life).

16 weeks
Changes from baseline in the Grade of toxicity of sensory neuropathy according to the CTCAE v.5.0. scale at the end of ozone treatment.
Časové okno: 16 weeks.

Changes from baseline in the Grade of toxicity of paresthesias (numbness, tingling) according to the CTCAE v.5.0. scale (from the National Cancer Institute of EEUU). Range from: Grade = (asymptomatic or mild symptoms) to Grade 4 (life-threatening consequences, urgent intervention indicated).

16 weeks.
Changes from baseline in the degree of neuropathy according to the QLQ-CIPN20 scale at the end of ozone treatment.
Časové okno: 16 weeks.

Changes from baseline in the degree of neuropathy according to the QLQ-CIPN20 scale at the end of ozone treatment (from the European Organization for Research & Treatment in Cancer (EORTC)). It is evaluated through 20 items that are grouped into 3 dimensions: sensitive, motor and autonomic. Range: each item is scored from 1 (nothing) to 4 (a lot). The total score for each dimension is transformed into a score from 0 to 1000, being 0 the best state and 100 the worst.

16 weeks.
Change from baseline in "Quality of Life" (using the EQ-5D-5L questionnaire) self-perceived by patients at the end of ozone treatment (week 16 after the commencement of ozone treatment).
Časové okno: 16 weeks.

Self-reported evaluation of: a) 5 physical and emotional items scored in five levels, from 1 (Best: I have no problem) to 5 (worst: I have an extreme problem or I am unable to…) and b) additional self-assessment of health by a visual analog scale (0 = worst health patient can imagine, 100 = best health patient can imagine).

16 weeks.
Changes from baseline in the "Quality of Life" according to the QLQ-C30 questionnaire at the end of ozone treatment.
Časové okno: 16 weeks.

Changes from baseline in the "Quality of Life" according to the QLQ-C30 questionnaire (from the European Organization for Research & Treatment in Cancer (EORTC)). Self-reported evaluation of 30 items that measure several scales and symptoms. Range (after standardization): from 0 (worst for overall health and function, best for symptoms) to 100 (best for overall health and functions, worst for symptoms).

16 weeks.
Changes from baseline in levels of anxiety and depression according to the Hospital Anxiety and Depression Scale (HADS), at the end of ozone treatment.
Časové okno: 16 weeks

Changes from baseline in levels of anxiety and depression according to the Hospital Anxiety and Depression Scale (HADS). HADS is a self-administered questionnaire that assesses 14 items/symptoms of anxiety (7) and depression (7) experienced by patients. Each item is scored from 0 (better, no alteration) to 3 (worse level of alteration). For each symptom (anxiety or depression), the overall score is from 0 (better, no anxiety or depression) to 21 (worse, very severe anxiety or depression).

16 weeks
Changes from baseline in biochemical parameters of oxidative stress at the end of ozone treatment.
Časové okno: 16 weeks.

Changes in serum levels of superoxide dismutase, glutathione, glutathione peroxidase and free radicals

16 weeks.
Changes from baseline in biochemical parameters of inflammation at the end of ozone treatment.
Časové okno: 16 weeks

Changes in serum levels of pro-inflammatory cytokines.

16 weeks
Changes from baseline in Hyperspectral signatures and infrared images obtained from hands and feet at then of ozone treatment.
Časové okno: 16 weeks

Assessment of the percentage of reflectance for each wavelength of the hyperspectral and infrared images obtained with specific devices.

16 weeks
Changes from baseline in the Grade of toxicity of paresthesias (numbness, tingling) according to the CTCAE v.5.0. scale at the end of follow-up.
Časové okno: 28 weeks.

Changes from baseline in the Grade of toxicity of paresthesias (numbness, tingling) according to the CTCAE v.5.0. scale (from the National Cancer Institute of EEUU). Range from: Grade = (asymptomatic or mild symptoms) to Grade 3 (severe symptoms, limiting self-care activities in daily life).

28 weeks.
Changes from baseline in the Grade of toxicity of sensory neuropathy according to the CTCAE v.5.0. scale at the end of follow-up.
Časové okno: 28 weeks

Changes from baseline in the Grade of toxicity of paresthesias (numbness, tingling) according to the CTCAE v.5.0. scale (from the National Cancer Institute of EEUU). Range from: Grade = (asymptomatic or mild symptoms) to Grade 4 (life-threatening consequences, urgent intervention indicated).

28 weeks
Changes from baseline in the degree of neuropathy according to the QLQ-CIPN20 scale at the end of follow-up.
Časové okno: Time frame: 28 weeks

Changes from baseline in the degree of neuropathy according to the QLQ-CIPN20 scale at the end of ozone treatment (from the European Organization for Research & Treatment in Cancer (EORTC)). It is evaluated through 20 items that are grouped into 3 dimensions: sensitive, motor, and autonomic. Range: each item is scored from 1 (nothing) to 4 (a lot). The total score for each dimension is transformed into a score from 0 to 1000, being 0 the best state and 100 the worst.

Time frame: 28 weeks
Changes from baseline in the "Quality of Life" according to the QLQ-C30 questionnaire at the end of follow-up.
Časové okno: 28 weeks.

Changes from baseline in the "Quality of Life" according to the QLQ-C30 questionnaire (from the European Organization for Research & Treatment in Cancer (EORTC)). Self-reported evaluation of 30 items that measure several scales and symptoms. Range (after standardization): from 0 (worst for overall health and function, best for symptoms) to 100 (best for overall health and functions, worst for symptoms).

28 weeks.
Changes from baseline in levels of anxiety and depression according to the Hospital Anxiety and Depression Scale (HADS) at the end of follow-up.
Časové okno: 28 weeks.

Changes from baseline in levels of anxiety and depression according to the Hospital Anxiety and Depression Scale (HADS). HADS is a self-administered questionnaire that assesses 14 items/symptoms of anxiety (7) and depression (7) experienced by patients. Each item is scored from 0 (better, no alteration) to 3 (worse level of alteration). For each symptom (anxiety or depression), the overall score is from 0 (better, no anxiety or depression) to 21 (worse, very severe anxiety or depression).

28 weeks.
Changes from baseline in biochemical parameters of oxidative stress at the end of follow-up.
Časové okno: 28 weeks.

Changes in serum levels of superoxide dismutase, glutathione, glutathione peroxidase and free radicals.

28 weeks.
Changes from baseline in biochemical parameters of inflammation at the end of follow-up.
Časové okno: 28 weeks.

Changes in serum levels of pro-inflammatory cytokines.

28 weeks.
Changes from baseline in Hyperspectral signatures and infrared images obtained from hands and feet at the end of follow-up.
Časové okno: 28 weeks.

Assessment of the percentage of reflectance for each wavelength of the hyperspectral and infrared images obtained with specific devices.

28 weeks.
Toxicity of rectal ozone treatment at the end of follow-up.
Časové okno: 28 weeks.

Grade of toxicity secondary to the rectal insufflation of the rectal ozone treatment according to the CTCAE v.5.0. scale (from the National Cancer Institute of EEUU).

28 weeks.

Spolupracovníci a vyšetřovatelé

Zde najdete lidi a organizace zapojené do této studie.

Sponzor

Spolupracovníci

Vyšetřovatelé

  • Studijní židle: Bernardino Clavo, MD, PhD, Hospital Universitario de Gran Canaria Dr. Negrín, (FIISC), Las Palmas, Spain
  • Ředitel studie: Francisco Rodríguez-Esparragón, BSc, PhD, Hospital Universitario de Gran Canaria Dr. Negrín, (FIISC), Las Palmas, Spain
  • Vrchní vyšetřovatel: Himar Fabelo, BSc, PhD, Hospital Universitario de Gran Canaria Dr. Negrín, (FIISC), Las Palmas, Spain
  • Vrchní vyšetřovatel: Francisco Rodríguez-Esparragón, BSc, PhD, Hospital Universitario de Gran Canaria Dr. Negrín, (FIISC), Las Palmas, Spain
  • Vrchní vyšetřovatel: Bernardino Clavo, MD, PhD, Hospital Universitario de Gran Canaria Dr. Negrín, (FIISC), Las Palmas, Spain
  • Vrchní vyšetřovatel: Gustavo M Callicó, Prof, PhD, University of Las Palmas de Gran Canaria

Publikace a užitečné odkazy

Osoba odpovědná za zadávání informací o studiu tyto publikace poskytuje dobrovolně. Mohou se týkat čehokoli, co souvisí se studiem.

Obecné publikace

Termíny studijních záznamů

Tato data sledují průběh záznamů studie a předkládání souhrnných výsledků na ClinicalTrials.gov. Záznamy ze studií a hlášené výsledky jsou před zveřejněním na veřejné webové stránce přezkoumány Národní lékařskou knihovnou (NLM), aby se ujistily, že splňují specifické standardy kontroly kvality.

Hlavní termíny studia

Začátek studia (Aktuální)

7. února 2025

Primární dokončení (Odhadovaný)

31. prosince 2029

Dokončení studie (Odhadovaný)

31. března 2030

Termíny zápisu do studia

První předloženo

22. listopadu 2024

První předloženo, které splnilo kritéria kontroly kvality

22. listopadu 2024

První zveřejněno (Aktuální)

26. listopadu 2024

Aktualizace studijních záznamů

Poslední zveřejněná aktualizace (Aktuální)

18. září 2026

Odeslaná poslední aktualizace, která splnila kritéria kontroly kvality

15. září 2026

Naposledy ověřeno

1. září 2026

Více informací

Termíny související s touto studií

Další identifikační čísla studie

  • OzoParQT
  • PI23/01324 (Jiné číslo grantu/financování: Instituto de Salud Carlos III)
  • 2024-517196-20-00 (Ctis)
  • 2023-210-1 (Identifikátor registru: CEIm Las Palmas)
  • CIGC'23/24 (Jiné číslo grantu/financování: Cabildo de Gran Canaria)

Plán pro data jednotlivých účastníků (IPD)

Plánujete sdílet data jednotlivých účastníků (IPD)?

ANO

Popis plánu IPD

It will be available (after request):

  • Individual participant data (IPD) that underlie the results reported in further articles, after deidentification
  • Data will be available after publication, ending 36 months following article publication.
  • They will be available for investigators whose proposed use of the data has been approved by an independent review committee identified for this purpose.
  • Study protocol

Proposals should be directed to: bernardinoclavo@gmail.com To gain access, data requestors will need to sign a data access agreement.

Časový rámec sdílení IPD

Data will be available after publication, ending 36 months following article publication.

Kritéria přístupu pro sdílení IPD

Data will be available for investigators whose proposed use of the data has been approved by an independent review committee identified for this purpose.

- Study protocol

Proposals should be directed to: bernardinoclavo@gmail.com To gain access, data requestors will need to sign a data access agreement.

Typ podpůrných informací pro sdílení IPD

  • PROTOKOL STUDY
  • MÍZA
  • ICF
  • CSR

Informace o lécích a zařízeních, studijní dokumenty

Studuje lékový produkt regulovaný americkým FDA

Ne

Studuje produkt zařízení regulovaný americkým úřadem FDA

Ne

Tyto informace byly beze změn načteny přímo z webu clinicaltrials.gov. Máte-li jakékoli požadavky na změnu, odstranění nebo aktualizaci podrobností studie, kontaktujte prosím register@clinicaltrials.gov. Jakmile bude změna implementována na clinicaltrials.gov, bude automaticky aktualizována i na našem webu .