Prevention and treatment of acute and chronic radiodermatitis

Introduction

International data indicate that 50% of patients diagnosed with cancer will receive some form of radiation therapy. Radiodermatitis is a substantial side effect that arises directly from radiation exposure during cancer treatment, and concerns around 95% of all cancer patients receiving radiation therapy.^1,2 It is particularly problematic in cancers of the breast, perineum, and head and neck region, where the skin is part of the target volume.³

Radiodermatitis is referred to as being an acute reaction when it occurs around the time of therapy and either chronic or late onset when it appears 5–10 years after the end of treatment. Symptoms of acute radiodermatitis have been classified into three levels; grade 1 (mild erythema), grade 2 (dry desquamation), and grade 3 (severe moist desquamation).⁴ In recent years, skin sparing and modern equipment such as intensity-modulated radiation therapy reduced dose intensity on the skin and new equipment has reduced the severity of acute radiodermatitis for many patients.⁵ Nevertheless, grade 1 skin toxicity still remains a problem for around 90% of patients and grade 2 for 30% of patients.⁶ While radiodermatitis may resolve over time, it can profoundly affect the patient’s quality of life and may limit the treatment duration and dose delivered.²

Chronic radiodermatitis occurs in a third of all patients and appears up to at least 10 years after radiotherapy treatment.⁷ Typical symptoms are telangiectasia, pigmentation, cutaneous atrophy (dry papery skin), dermal sclerosis, and keratoses.⁴ Chronic radiodermatitis is an increasing problem, as today >80% of all women treated for breast cancer are now surviving for ≥10 years.⁸

Fortunately, there are several solutions available today to prevent and treat radiodermatitis and skin reactions. Dermocosmetic support is recommended to protect and promote tissue repair; light technology, such as biophotomodulation and vascular laser treatments, is becoming established as safe and effective to protect and treat both acute and chronic radiodermatitis.^9,10

The objective of this review paper is to provide an overview of the different types of radio and combined chemotherapy-induced radiodermatitis and highlights the evidence for management and treatment.

Radiodermatitis

Radiodermatitis is the result of cutaneous or subcutaneous lesions induced by external beam radiation. The skin is particularly sensitive to radiation damage because it is a continuously renewing organ. In healthy skin tissue, there is a delicate balance between the death and rebirth of each cell type. Acute radiation damage occurs in the dermis with the first radiation dose. A number of basal keratinocytes are destroyed, leaving only the remaining keratinocytes to cornify. Thus, the balance between the normal cell production at the basal layer and cell destruction at the skin surface is disrupted. This process continues with continuing radiation thereby altering the integrity of the epidermis, the skin barrier, and skin healing processes. This leads to structural, histologic, and vasculature changes of the skin and underlying connective tissue.¹¹

With cumulative radiation doses, these acute injuries become apparent. The skin barrier dysfunction manifests as erythema, skin dryness, flaking, folliculitis (skin rash), xerosis, pruritus, and hyperpigmentation. Additionally, the physical barrier and cutaneous immune system are compromised and the skin becomes more sensitive to allergens, ultraviolet radiation, and infection.¹²

Some cutaneous cell types grow and renew themselves rapidly and in others the life cycle is slower. Radiation affects these two populations differently and the probability of destroying a skin cell increases with the level of radiation. Thus, it is possible to have different types of skin reactions occurring at the same time postradiation depending on which cell types have been affected.¹³

Supportive dermocosmetic skin care for patients starting radiotherapy

Regular skin care assessment and close collaboration between radiation oncologists and dermatologists to manage skin reactions early and throughout treatment have been repeatedly suggested to improve patient comfort, enhance quality of life, and improve clinical outcome.^14–16 However, there is little evidence concerning skin care products to alleviate the severity of skin reactions.¹⁷

One recent, multinational, real-life study to evaluate a combination of hygiene products was performed in women starting radiotherapy following breast cancer. The objective was to evaluate the tolerance of a specific dermocosmetic regimen on the irradiated area and the effectiveness in delaying or reducing the intensity of acute radiodermatitis. This was measured by erythema, edema, skin dryness, desquamation, physical appreciation, and patient appreciation using the patient benefit index at the start and end of treatment (6±2 weeks).¹⁸ Patients were provided with a dermocosmetic kit before the first radiotherapy session. The kit included five products specifically formulated with gentle ingredients that respect skin physiology and tested for use on sensitive skin. In total, 253 women were included in the study, following a tumor excision, partial or full mastectomy. The results revealed two categories of users who were defined by the number (0–5) and frequency of products used (never, sometimes, often, and every day). Low users made up 36% of the study group and 57% were heavy users. This study shows that this skin care regimen was well tolerated on irradiated skin and heavy product users observed less frequent radiodermatitis reactions than low product users (Figure 1). These results were further supported by a recent conference communication that found that the frequency of severe (grade 3 or 4) radiodermatitis was significantly lower in the intervention group (chi-square =4.61; p=0.03), although the time to onset of skin toxicity was similar among the intervention group compared with a previous cohort (median time to onset, 17 vs 17.5 days),¹⁹ thus indicating that patient education can improve adherence to skin care plans and reduce radiation dermatitis. These reports continue to provide support for international recommendations for supportive skin care in radiotherapy.

Figure 1 Time to onset of radiodermatitis from radiotherapy start. Abbreviations: S, significant; NS, non significant.

Acute radiodermatitis

Acute radiodermatitis is a burn injury that varies in severity according to both treatment and inherent patient factors.¹ Treatment-related factors that influence the degree to which skin tissues are damaged include the total dose, fractionation, type and quality of the beam, and surface area and volume of tissue exposed.¹¹ Also, certain anatomical regions where the target is close to the skin are more susceptible to developing radiodermatitis. These areas include skin folds around the breast and inguinal areas, thin cutaneous regions (clavicle, periauricular area, or axilla), mucosal regions (vulva, anus, and mouth), or altered skin following a previous treatment.

Concomitant radiotherapy with chemotherapy such as epidermal growth factor receptor (EGFR) inhibitors seems to increase the intensity of the EGFR inhibitors-induced rash and delays the appearance by 2–5 weeks after the beginning of treatment.^20–22

Typical radiotherapeutic treatment such as a dose intensity of 20 Gy with conventional fractionation (2 Gy/fraction; five fractions/week) results in sustained erythema that usually appears between 10 and 14 days after radiotherapy.²³ Although most acute radiodermatitis reactions resolve after 2–3 weeks, some reactions persist and can cause complications such as treatment delays, diminished esthetic appeal, and reduced quality of life.^2,24,25

Treatment of acute radiodermatitis

Today, there is insufficient evidence available to form recommendations that would prevent or reduce radiodermatitis. However, several multidisciplinary groups have proposed guidelines that suggest management strategies with the objective to avoid or reduce the severity of radiodermatitis reactions: Association Francophone des Soins Oncologiques de Support,²⁶ Multinational Association of Supportive Care in Cancer,⁴ European Skin Management in Oncology,¹⁶ and consensus guidelines for the management of radiodermatitis and coexisting acne-like rash.^21,27 Nevertheless, many centers develop their own protocols.

The general recommendations are presented in Table 1. Low level light therapy (LLLT), otherwise known as photobiomodulation (PBM) or “soft laser” (red light or infrared, power <150 mW), is better known in dermatology to treat ulcers.²⁸ However, the biological mechanisms behind the therapeutic effect are currently not well understood. Recent molecular and cellular research suggests that LLLT has biostimulating properties which allow the tissues to regenerate and heal faster.^9,10 Animal and clinical studies suggest that LLLT has analgesic properties, reduces inflammation, and prevents fibrosis.^29–31

Table 1 General recommendations Notes: Data from these studies.16,42,43

Treating radiodermatitis with LLLT is based on previously demonstrated decreased severity and duration of oral mucositis.^32–34 However, its preventative and curative use in acute radiodermatitis is currently under evaluation. It was reported that the incidence of radiodermatitis reduced with light emitting diode treatments immediately after radiation therapy for breast cancer. However, a further controlled clinical study was unable to reproduce the results.³⁵ Nevertheless, based on the strong level of evidence available, Bensadoun and Nair proposed a protocol to prevent or treat radiation dermatitis using LLLT. The authors suggest that laser therapy can be started after only a few radiation sessions and before erythema appears or even after erythema has appeared. The treatment was shown to be painless and can be practiced thrice per week, either before or after the radiotherapy session.³⁶ More recently, Censabella et al performed an open, prospective, comparative study and found that skin toxicity improved significantly following multiwave locked system® laser therapy.³⁷

Chronic radiodermatitis

Chronic radiodermatitis, otherwise referred to as late reaction, is characterized by its highly variable, delayed apparition. This late-onset reaction can appear from 6 months up to 20 or 30 years after treatment and can reappear when provoked by the administration of a different treatment such as chemotherapy or antibiotics. The frequency and severity have been shown to be linked with the total dose (+50 Gy to the skin) and favored by short treatment intervals, limited fraction size, large treatment areas, and tumor infiltrate. Other external factors that aggravate chronic radiodermatitis include repetitive trauma, sun exposure, and further irradiation. Chronic radiodermatitis is dominated by telangiectasia that forms on atrophic and fragile skin, associated with areas of hyper or hypopigmentations.³⁸ Less commonly, a more severe form of delayed radionecrosis occurs where the skin sits close to bone or cartilage such as the nose, ears, or scalp.²³

Pulsed dye laser treatment has been shown to be beneficial in clearing radiation-induced telangiectasia. The first prospective study reported by Lanigan et al was performed on eight individuals. This study demonstrated that lesions could be whitened using very short pulse durations (0.45 ms) using a 585 nm pulsed dye laser.³⁸ The study was later supported by a larger comparative study with 13 participants that compared three sessions of either pulsed dye laser or pulsed intense light laser. Patients treated with the pulsed dye laser had a reduction in lesion size of 90%, compared to 50% with the intense pulsed light (IPL). IPL systems are high-intensity light sources, which emit polychromatic light. Unlike laser systems, IPL works with noncoherent light in a broad wavelength spectrum of 515–1200 nm. Both procedures were well tolerated, except for one case of achromia with the IPL.³⁹ Furthermore, over a number of years, Dr JM Mazer performed several open clinical studies on large patient numbers to further refine the number treatment modality (Figure 2).⁴⁰ The first study included 110 women, treated with a pulsed dye vascular laser (ScleroPlus laser [Candela] followed by Vbeam laser [Candela]) at 1.5 ms pulse duration, wavelength 595 nm, with a spot size diameter of 7 mm, and fluence of 9–11.5 J/cm². Between one and five sessions were required to reduce the number of telangiectasias by 80%. A second study was performed with a more recent pulsed dye laser (Vbeam Perfecta laser [Candela]) comparing 1.5 to 6 ms pulse durations, with purpuragenic fluences, for the same spot size diameter and the same wavelength of 595 nm. The number of patients included for post-breast cancer radiotherapy was 176, presenting a total of 234 different lesions, 144 on the presternal area and 90 on the lateral side of the breast. The main criterion of efficacy was the number of needed sessions to obtain 80% reduction in telangiectasias, according to both the patient and the physician. The objective was to investigate if longer pulse durations would be more effective on more dilated vessels, typical of radiodermatitis, according to the rules of selective photothermolysis. However, although the efficacy was satisfactory for both pulse times, the shorter pulse durations were more effective: all patients obtained at least 80% regression in telangiectasia, after two or three sessions for 84% of cases with the 1.5 ms, and in less than five sessions in 95% of cases.⁴¹ Pulsed dye laser has been shown to be safe and well tolerated in this population with particularly atrophied skin. Purpura resolved within 10–15 days. No further supportive care is required apart from sunscreen for at least 6 weeks following the procedure. No severe side effects were observed, neither scars nor skin necrosis nor ulceration. Patients reported a significant improvement in quality of life. The physicians noticed an improved skin thickness, probably related to the remodeling effect, known with this laser. The authors suggested that other lasers, particularly fractional ablative lasers or, on this fragile skin, non-ablative lasers, could be effective in reducing atrophy and improving the skin texture.

Figure 2 Example of results obtained after two sessions of vascular laser and two sessions of fractional non-ablative laser. Note: (A) Before treatment; (B) after treatment.

Conclusion

Today, there is increasing evidence to support various strategies to limit and treat cutaneous reactions to radiotherapy. To prevent acute radiodermatitis, daily dermocosmetic use is useful from the beginning of radiotherapy. There is evidence for the efficacy of PBM to both prevent and cure acute radiodermatitis. In chronic radiodermatitis, treatment with vascular lasers, especially pulsed dye laser, using short pulse durations, has been shown to be effective with an excellent tolerance, inducing a better quality of life for the patients.

Acknowledgment

The authors thank Amanda Whereat of Speak the Speech Consulting for providing assistance to write this article. This article was funded by La Roche-Posay Laboratoire Dermatologique, France.

Disclosure

SS is an employee of La Roche-Posay Laboratoire Dermatologique, France. The authors report no other conflicts of interest in this work.

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