Cronshaw M. et al. - Photobiomodulation for the prevention and management of oral mucositis: a systematic review

This systematic review analyzed 29 publications on photobiomodulation and oral mucositis, selected from 782 abstracts. The authors conclude that early preventive application offers a clear advantage in clinical management and emphasize the importance of controlling irradiation parameters. Photobiomodulation is used here as supportive care, never as a treatment for cancer.

What this study measured

Oral mucositis is a debilitating complication of chemotherapy and radiation therapy to the head and neck. This study aimed to formulate the best possible recommendations based on the published literature, with an extensive discussion of dosimetry and dose delivery. The authors searched PubMed, Google Scholar, and the Cochrane databases for studies published between 1995 and 2019. This is a systematic review, not a meta-analysis: the results of the studies are not combined into a single numerical estimate. The criteria examined were the timing of intervention, the incidence and severity of oral mucositis, and pain relief. Univariate and multivariate statistical analyses were conducted on the methods used. No PROSPERO number is mentioned in the abstract.

Key Findings

The selection process and the lessons learned are as follows.

• A total of 782 abstracts were identified
• 50 articles analyzed in detail
• 29 articles that meet the criteria for an optimized PRISMA statement
• Period covered: 1995 to 2019
• According to the authors, early prophylactic use offers clear benefits for clinical management
• Recommendations are made regarding the timing of the intervention

The authors note considerable variability among the studies: delivery techniques, wavelengths, and other optical parameters. The abstract does not include any overall quantitative effects, confidence intervals, or p-values, which is consistent with the absence of a meta-analysis.

How photobiomodulation works for this indication

The mechanism discussed in this field of research remains a hypothesis. Red and near-infrared light is believed to be absorbed by cytochrome c oxidase, an enzyme in the mitochondrial respiratory chain. This absorption could alter ATP production and the state of oxidative stress in oral mucosal cells. This would result in a modulation of local inflammation and possible support for mucosal healing, which would explain the benefit of application before the onset of lesions rather than after. This mechanistic reasoning is not demonstrated by this review, which focuses on reported clinical results.

Limits You Should Know

The lack of a meta-analysis is the major limitation: no summary figures can be provided. The review ends in 2019, which excludes more recent studies. Google Scholar, used as a source, is not a controlled bibliographic database. The authors themselves highlight the number of variables and covariates involved, which makes comparisons between studies difficult. Finally, the conclusion emphasizes the need for comprehensive training of practitioners, which means that the outcome depends heavily on implementation conditions.

What This Means in Practice

The key takeaway focuses on timing rather than the tool itself: early, preventive use is presented as preferable to late intervention. This approach falls under the responsibility of the hospital team providing oncology and supportive care to the patient. The authors recommend that clinicians use photobiomodulation only with a thorough understanding of the optical parameters and appropriate training. None of this replaces prescribed cancer treatment.

Frequently Asked Questions

Should photobiomodulation be started before oral mucositis develops?

This is the main recommendation of this review of 29 publications: early prophylactic treatment appears to offer clear advantages over later intervention. The timing of the intervention is one of the factors analyzed by the authors. The decision rests with the team caring for the patient.

Are there any standardized photobiomodulation parameters for oral mucositis?

No, and that is precisely the point the authors are making. Delivery techniques, wavelengths, and other optical parameters vary widely from one study to another. The abstract does not provide reference values that can be used as is.

Does this review provide an overall effectiveness figure?

No. This is a systematic review without a meta-analysis: the results of the 29 included studies are not combined into a single estimate. Therefore, no percentage reduction or confidence interval can be reported based on this study.

Reference

Cronshaw M, Parker S, Anagnostaki E, Mylona V, Lynch E, Grootveld M. Photobiomodulation and Oral Mucositis: A Systematic Review. Dentistry Journal, 2020. PMID 32764305. View the study on PubMed

This summary is provided for informational purposes only and does not constitute medical advice. Photobiomodulation is not a substitute for prescribed treatment. Consult a healthcare professional.