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Updated June 2026 · ClinicalTrials.gov

RECRUITINGPhase 2 / Phase 3INTERVENTIONAL

Ozone Therapy in Chemotherapy-induced Peripheral Neuropathy: RCT (O3NPIQ)

Effectiveness and Cost-effectiveness of Ozone Therapy in Patients With Pain Secondary to Chemotherapy-induced Peripheral Neuropathy. Randomized, Triple-blind Clinical Trial (O3NPIQ)

Ozone Therapy in Chemotherapy-induced Peripheral Neuropathy: RCT (O3NPIQ) (NCT04299893) is a Phase 2 / Phase 3 interventional studying Chemotherapy-induced Peripheral Neuropathy and Pain, Neuropathic, sponsored by Bernardino Clavo, MD, PhD. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

Important: This information is not medical advice. Talk to your doctor about whether a clinical trial is right for you.

About This Trial

The main objective of this clinical trial is to evaluate the effectiveness and cost-effectiveness of adding ozone therapy to the clinical management of patients with pain secondary to chemotherapy-induced peripheral neuropathy

What Stage of Research Is This?

Phase 2 trials evaluate whether a treatment actually works against Chemotherapy-induced Peripheral Neuropathy and continue monitoring side effects. Phase 2 enrolls larger groups (typically 100–300 patients) and produces the first real efficacy signal. A successful Phase 2 readout is what unlocks the much larger Phase 3 confirmatory trials needed for FDA approval.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

With a target enrollment of 42 participants, this is a small study — typical of early-phase research, rare-disease trials, or pilot studies designed to generate preliminary signal before a larger study is launched.

Who May Be Eligible (Plain English)

Who May Qualify: - 1\. Adults \> = 18 years old. - 2\. Any kind of cancer in any stage, treated with any kind of chemotherapy, and life expectancy \> = 6 months. - 3\. Clinical diagnosis of painful chemotherapy-induced peripheral neuropathy, toxicity Grade 2 or higher according to the Common Toxicity Criteria for Adverse Events (CTCAE) from the National Cancer Institute of EEUU, v.5.0, for \> = 3 months and without the inclusion of new treatments for pain and/or neuropathy for \> = 1 month. - 4\. "Average pain" \> = 3/10 according to the Brief Pain Inventory-Short Form (BPI-SF) \> = 3 months beyond chemotherapy completion. - 5\. Pregnant women cannot participate in the clinical trial. - 6\. 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 the 14 days prior to the first ozone therapy session up to 14 days after the last one. - 7\. Patients who have signed and dated the study 's specific willing to sign a consent form Who Should NOT Join This Trial: - 1\. Age \< 18 years old. - 2\. Pregnancy at the time of enrollment. - 3\. Women with childbearing potential who are unwilling to perform a pregnancy test and/or employ adequate contraception from the 14 days prior to the first ozone therapy session up to 14 days after the last one. - 4\. Clinical suspicion that peripheral neuropathy (compressive or diabetic neuropathy) in the same area prior to receiving neurotoxic chemotherapy. - 5\. Psychiatric illness or social situations that would limit compliance with study requirements. - 6\. Those who are unable to fill in the scales used to measure quality of life variables - 7\. Specific liver enzymes \[Aspartate Aminotransferase (AST), and Alanine Aminotransferase (ALT) \> 5 times the upper limit of normal - 8\. Increased creatinine \> 3 times the upper limit of normal. ...See full criteria on ClinicalTrials.gov Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language
Inclusion Criteria: * 1\. Adults \> = 18 years old. * 2\. Any kind of cancer in any stage, treated with any kind of chemotherapy, and life expectancy \> = 6 months. * 3\. Clinical diagnosis of painful chemotherapy-induced peripheral neuropathy, toxicity Grade 2 or higher according to the Common Toxicity Criteria for Adverse Events (CTCAE) from the National Cancer Institute of EEUU, v.5.0, for \> = 3 months and without the inclusion of new treatments for pain and/or neuropathy for \> = 1 month. * 4\. "Average pain" \> = 3/10 according to the Brief Pain Inventory-Short Form (BPI-SF) \> = 3 months beyond chemotherapy completion. * 5\. Pregnant women cannot participate in the clinical trial. * 6\. 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 the 14 days prior to the first ozone therapy session up to 14 days after the last one. * 7\. Patients who have signed and dated the study 's specific informed consent Exclusion Criteria: * 1\. Age \< 18 years old. * 2\. Pregnancy at the time of enrollment. * 3\. Women with childbearing potential who are unwilling to perform a pregnancy test and/or employ adequate contraception from the 14 days prior to the first ozone therapy session up to 14 days after the last one. * 4\. Clinical suspicion that peripheral neuropathy (compressive or diabetic neuropathy) in the same area prior to receiving neurotoxic chemotherapy. * 5\. Psychiatric illness or social situations that would limit compliance with study requirements. * 6\. Those who are unable to fill in the scales used to measure quality of life variables * 7\. Specific liver enzymes \[Aspartate Aminotransferase (AST), and Alanine Aminotransferase (ALT) \> 5 times the upper limit of normal * 8\. Increased creatinine \> 3 times the upper limit of normal. * 9\. Hemodynamically or clinically unstable patients or uncontrolled severe illness. * 10\. Uncontrolled cancer disease. * 11\. Leptomeningeal carcinomatosis. * 12\. Life expectancy \< 6 months * 13\. Contraindication or disability for rectal ozone administration or to attend scheduled treatments. * 14\. Known allergy to ozone. * 15.Patients who do not meet all the inclusion criteria.

Treatments Being Tested

DRUG

Ozone

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

DRUG

Oxygen

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

Locations (2)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

Complejo Hospitalario Materno Insular
Las Palmas de Gran Canaria, Las Palmas, Spain
Hospital Universitario de Gran Canaria Dr. Negrín
Las Palmas de Gran Canaria, Las Palmas, Spain

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT04299893), the sponsor (Bernardino Clavo, MD, PhD), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT04299893 clinical trial studying?

The main objective of this clinical trial is to evaluate the effectiveness and cost-effectiveness of adding ozone therapy to the clinical management of patients with pain secondary to chemotherapy-induced peripheral neuropathy The full protocol is registered on ClinicalTrials.gov and includes the primary outcome measures, eligibility criteria, and study endpoints.

Who can participate in NCT04299893?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT04299893?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

Related Chemotherapy-induced Peripheral Neuropathy Trials

Methadone to Treat Painful Chemotherapy Induced Peripheral Neuropathy

Phase 2 / Phase 3 · University of British Columbia

Source: ClinicalTrials.gov API v2 record for NCT04299893. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT04299893. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-06-26 · Data from ClinicalTrials.gov.