In 2016, approximately 1,700,000 new cases of cancer were diagnosed. It is estimated that the number of new cases of cancer is 484 per 100,000. The number of patients living beyond their cancer diagnosis is estimated to be 14.5 million in 2014 and is expected to be 19 million by 2024.
It is estimated that half of the patients with cancer will receive radiation therapy, with skin injuries due to radiation therapy occurring in approximately 95%. Also, accidental and occupational exposure to radiation contributes to a number of patients with radiation injuries and skin.
Chronic manifestations of radiation injuries may include radiation-induced fibrosis of the skin, nonhealing ulcers, osteoradionecrosis, compromised muscle flaps, and dehiscence of surgical closures.
A constant state of skin renewal that occurs approximately every 26 days makes the skin more vulnerable than any other organ to ionizing radiation injury. Ionizing radiation creates free radicals and reactive oxygen intermediates that lead to DNA and protein damage, as well as damage to cellular membranes of rapidly proliferating tissue.
Skin injuries ranging from erythema to full chronic wounds occur in about 95% of patients who undergo radiation therapy. Occupational and accidental radiation exposure are also risk factors for radiation injury. The areas of the body that are more susceptible to radiation injury are the skin of the face, neck, trunk, and extremities.
As the effects of radiation to the skin are cumulative, there are more severe skin injuries toward the end of the radiation. The degree of injury depends mainly on the radiation intensity and the patient's tissue sensitivity to the radiation.
The concept of radiation recall involves the skin recalling a previous radiation exposure to a particular area when chemotherapeutic agents such as doxorubicin or docetaxel are administered within 2 months of the radiation treatment.
The primary pathophysiology of the injury is hypoxia due to the progressive obliteration of the microvasculature (progressive endarteritis) and fibrosis. Impaired wound healing in a previously irradiated area occurs due to disruption of the natural progression of the overlapping wound healing phases (hemostasis, inflammatory phase, proliferative phase, and remodeling phase). These disruptive can be grouped into several categories: cellular depletion, extracellular matrix (ECM) alteration, microvascular changes, cytokine and growth factor dysregulation.
Pandya et al. examined specimens from 27 patients with OSCC (oral squamous cell carcinoma) who received radiation therapy involving the jaw and neck. He found significant tissue atrophy and severity of dysplasia, an increased presence of fibrinous exudative necrosis, vessel wall thickening, with oropharyngeal ectasia of the salivary gland. In addition, dense fibrosis with thick fibers was a common finding of post-radiation tissue in the same patients. Similar findings at other sites may be inferred regarding increased tissue fibrosis and hypoxia due to damaged microvasculature; glands within the dermal layer will also be affected similarly. These findings again confirmed the microvasculature thrombosis and tissue fibrosis characteristic of post-radiation skin changes that lead to eventual ulcers.
At the time of the patient's evaluation, a thorough history should reveal the initial diagnosis for which radiation therapy was used, as well as the site of the radiation exposure, and finally the total amount of radiation that the patient has received. It is important to note the radiation dose as well as the timing of the onset of the observed skin changes. Any associated chemotherapy will also need to be documented, in particular, the types of chemotherapeutic agents used. Again, certain therapeutic agents were present as risk factors for radiation recall, as discussed above; some of the chemotherapeutic agents that will predispose to radiation recall are doxorubicin, docetaxel, paclitaxel, tamoxifen, methotrexate, to name a few. Chemotherapeutic agents such as doxorubicin, bleomycin, disulfiram, cisplatin, and mafenide acetate are also relative contraindications to hyperbaric oxygen treatment, a treatment modality that is often used as an adjuvant treatment for late effects of radiation skin changes such as ulcerations.
Overall, a thorough history will be important in providing documentation that will aid in choosing a specific treatment algorithm, especially if it involves hyperbaric oxygen treatment.
In addition to the physical exam that is customary for every patient evaluated for any disease process, there should be a particular focus on the presentation of the skin injury itself, as this will decide the treatment modality to be used, depending on the classification of radiation injury. Clinical manifestation of chronic radiation skin injury includes xerosis, hyperkeratosis, decreased or absent sweating, skin atrophy and dyspigmentation, as well as necrosis with full-thickness wounds, and others.
There should be a particular focus in identifying any contraindication to possible hyperbaric oxygen treatment, a treatment modality that is often used with late effects of radiation on the skin. A neck and head and exam is important, with a special focus on the eye for cataracts. The tympanic membranes should be evaluated for any scarring or other abnormalities that may make it hard for the pressure to equalize within the inner year. A chest radiograph to confirm the absence of any acute disease processes and for bullous diseases should be obtained given the high incidence of pneumothorax under more than one atmospheric pressure that is typical of a hyperbaric treatment protocol.
Evaluation of the patient with skin injury due to radiation treatment should include all relevant tests necessary for initiation of a specific treatment modality such as hyperbaric oxygen treatment; these tests would include a chest x-ray, a hemoglobin A1C, a sedimentation rate, and a complete blood count (CBC) if infection might be present.
Other tests may be ordered as applicable depending on the presentation of the patient at the time of the initial visit or if any complications were to arise during treatment.
In general, the treatment of radiation injury to the skin, acute, subacute or delayed, should reflect the extent of the injury itself, keeping in mind that necrotic tissue should be debrided, infection and inflammation should be managed properly, moisture management should not be ignored and continuous evaluation of the progression of the wound given the therapy employed should be done regularly with a treatment modality change depending on the status of the reepithelialization progress. In other words, standard wound management concepts should still be applied, with strict modifications given the etiology of the of the injury itself, ether just acute erythema at the skin or full thickness chronic wound.
Management of Injury to the irradiated skin should begin with patient education in regards to skin care during the pre-radiation phase, post radiation phase and during the radiation treatment period. Education to the patient should include promotion of personal hygiene and wound hygiene, promotion of comfort, prevention of trauma to the affected skin, and management of radiation dermatitis.
Choices of cleanser and moisturizers and topical creams in radiation-induced skin injuries should reflect the extent of the injury itself. Products such as Natural Care Gel, Eucerin cream, Lubriderm, and corticosteroid cream can be used for erythema and dry desquamation. If an infection is present topical antibiotic ointment such as Neosporin or silver sulfadiazine 1% can be used, although the need for systemic antibiotic should be assessed as well'
Additional management manifesting irradiation injuries to the skin can be broken down by the presenting clinical pathology:
Hyperbaric oxygen treatment has one of the most frequent applications and delays radiation injuries, with up to one-third of patients treated with HBO2 for radiation injury in the United States. Even the mechanism of injury of ionizing radiation to be mainly hypoxia and increased district fibrosis, better oxygen treatment has been shown to increase angiogenesis and therefore improving oxygenation as well as reduce fibrosis, although this effect has not been fully investigated and explain.
Another mechanism of action of delayed radiation injury has been the negative impact of ionizing radiation on stem cells (Feldmeier J, Hyperbaric oxygen therapy and delayed radiation injury (soft tissue and bone necrosis. All serious investigations are now being pursued based upon luminary evidence that hyperbaric oxygen treatment increases the number of stem cells radiation injury site.
In general, the patient's prognosis will depend on several factors, mainly the extent of the radiation injury in terms of grades 1, 2, 3, or 4, as well as associated comorbidities.
The management of radiation injury to the skin, especially grade 4 in which there are skin necrosis and full-thickness wounds, is complex with no accepted standards regarding specific modalities that are based upon irrefutable conclusions from RCT with a large number of patients. There are, however, accepted guidelines based on retrospective reviews that contain a small or large number of subjects. These reviews suggest, in general, that the treatment of radiation injuries, either acute, subacute or delayed, should follow good medical practices, with adaptations of known wound care principles to the problem at hand. For the management of full-thickness wounds due to delayed radiation injury, the accepted guidelines of management of necrotic tissue, prevention, and treatment of infections, management of wound exudate, and reevaluation of the treatment plan based upon observation of wound progress, should be coupled with patients education. This education should include everyday skin and wound care management and evaluation for methylxanthine derivatives in conjunction with hyperbaric oxygen treatment as well as the application of tissue containing stem cells, other live cells, as well as cytokines and growth factors, coupled with a healthy extracellular matrix.
Consultations for wound management in patients with radiation injury to the skin would generally require the input of specialists with expertise that may be beneficial to the patient depending on the location and the extent of the injury. Useful input by evaluation from plastic surgery, infectious disease, otorhinolaryngology, dermatology, and certified specialists in wound managements with expertise in hyperbaric oxygen treatment will maximize the patient's potential for recovery.
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