Among the possible complications of radiation therapy, acute and chronic side effects on the skin can be induced by percutaneous radiotherapy in the target site. Common skin lesions include radiation dermatitis, which can be treated by topical application of dressing and ointment. Pemphigoid disease, which displays similar clinical features as other skin diseases such as recurrent cancer and herpes zoster, rarely occurs in the site of radiotherapy; therefore, care must be taken during diagnosis for a timely treatment. The present report is a case of pemphigoid disease that had developed in a patient with endometrioid/clear cell carcinoma after radiation therapy, and the time between onset and radiotherapy was more than 6 months.
Pemphigoid is subepidermal autoimmune disease associated with internal malignancies including endometrial cancer and it has various clinical manifestation. Erosions and erythema with multiple blisters develop all over the body. After administration of radiotherapy, this rare complication can occur in the irradiated area. Also there are several chemotherapeutic agents have many side effects including skin toxicity, and it significantly worsens the quality of life of patients. Long term Radiation along with chemotherapy can easily harm on skin barrier, and its disruption often cause autoimmune blistering disease.
We report a case of radio-induced bullous pemphigoid in elderly woman, who was treated for endometrial cancer and suffered pemphigoid after the radiation therapy, treated with steroid therapy.
A 66-year-old female patient who was diagnosed with endometrioid/clear cell carcinoma had progression to stage Ib after radical hysterectomy. She received adjuvant chemotherapy with paclitaxel/carboplatin. There was no response to first-line chemotherapy, and a possible brain metastasis was suspected on computed tomography. Thus, chemotherapy was terminated, and she underwent whole-pelvis and wholebrain radiotherapy for 3 months.
Eight months later, she revisited the hospital for pain from bullae and erosion in the right thigh. A topical corticosteroid cream and an antihistamine were prescribed for allergic dermatitis or radiation dermatitis. However, the bullae continued to spread. Therefore, valaciclovir and acyclovir creams were administered for 7 days, after which she was admitted, as the bullae over 0.5 cm in size further expanded to 5 cm and the erosion worsened (
Pemphigoid is an autoimmune disease characterized by bullae formation resulting from the antigen–antibody reaction when autoantibodies bind to the hemidesmosome complex of the skin in the basement membrane zone.
The exact cause of pemphigoid is unknown, but it may be induced by certain drugs, including sulfasalazine, furosemide, and penicillin, and rarely by local burns, ultraviolet phototherapy, and radiotherapy [
There are only a few reports of radiation-induced pemphigoid. It is a very rare complication in which radiation interferes with the sulfhydryl group in cells and changes the antigenic properties of the cell surface, leading to the antigen–antibody reaction underlying pemphigoid.
The clinical signs of pemphigoid include bullae and rash, with or without itching. The outbreak occurs usually within 1 year after radiation treatment [
Such skin diseases can be worsened by several factors such as radiation dose, presence of other skin diseases, presence of a lesion due to previous chemical damage, obesity, smoking, and malnutrition. Patients receiving radiotherapy must be cautious of the above risk factors.
Treatment of radiation-induced pemphigoid using systemic corticosteroids usually yields excellent results. Oral steroids at low daily doses of approximately 20–40 mg are recommended, but continued use increases the risk of bone density decline and diabetes. Care must be taken during long-term use, and the dosage should be reduced once there is an improvement in the lesion [
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On hospital day 4, diffuse and erythematous bullae size worsened in the right thigh. We only applied acyclovir cream on the lesion.
After administering prednisolone and antibiotics, inflamed area healed and erythema did not spread.