Dermatologic Therapy, Vol. 28, 2015, 282–286 Printed in the United States  All rights reserved

C 2015 Wiley Periodicals, Inc. V

DERMATOLOGIC THERAPY ISSN 1396-0296

THERAPEUTIC HOTLINE An unusual case of diffuse Merkel cell carcinoma successfully treated with low dose radiotherapy Foteini Chatzinasiou*, Euaggelia Papadavid*, Penelope Korkolopoulou†, Georgia Levidou†, Ioannis Panayiotides‡, Konstadinos Theodoropoulos*, Vasiliki Pogka§, Charalampos Asimakopoulos¶ & Dimitrios Rigopoulos* *2nd Department of Dermatology, Attikon General University Hospital, Athens, Greece, †Department of Pathology, Laikon General Hospital, National and Kapodistrian University, Athens, Greece, ‡Department of Pathology, Attikon General University Hospital, Athens, Greece, §Hellenic Pasteur Institute, Athens, Greece and ¶Department of Radiotherapy, Attikon General University Hospital, Athens, Greece

ABSTRACT: Merkel cell carcinoma (MCC) is a rare and highly aggressive neuroendocrine carcinoma of the skin. MCC should be included in the diagnosis of a rapidly growing infiltrating mass and histology as well as laboratory investigations such as Merkel cell polyoma virus (MCPyV) detection are valuable in its diagnosis. We present an unusual case of giant MCC-positive MCPyV in a Greek woman located on the lower leg. Our patient is very unusual in terms of her extensive MCC and her rapid and complete response to radiotherapy. KEYWORDS: giant Merkel cell carcinoma, immunohistochemistry, Merkel cell polyoma virus, radiotherapy

Introduction Merkel cell carcinoma (MCC) is a rare (ageadjusted incidence rates 0.18–0.41 per 100,000 persons) and highly aggressive neuroendocrine carcinoma that is known for its ability to metastasize, its high recurrence rate and a mortality rate greater than that of malignant melanoma (1,2). In 2008, there were approximately 1500 Address correspondence and reprint requests to: Foteini Chatzinasiou, MD, PhD, 2nd Department of Dermatology, Attikon General University Hospital, Rimini 1, 12462 Athens, Greece, or email: [email protected].

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MCC cases per year in the United States. More importantly, however, the age-adapted incidence appears to have tripled from 1986 to 2001 with a statistically significant annual increase of 8% (3). MCC develops most often in sun-exposed areas as a solitary dermal nodule red to livid with a smooth, shiny surface. Tumor size is frequently 50 Gy was associated with a better survival. In the literature, also recent, there are several studies reporting on the efficacy of radiotherapy for MCC and the cases described are more than 40 (29,30). Radical radiotherapy is effective in the curative treatment of MCC, especially in patients who would tolerate wide surgical excision poorly, or where it would cause significant cosmetic or functional deficits (29). Patients with MCC treated with radiotherapy alone experience a high likelihood of obtaining in field disease control. Doses of 50–55 Gy in 20–25 fractions are recommended but lower doses (25 Gy in five fractions) are still effective (30). These retrospective studies reported successful results also in some so called “gross tumor.”

Conflict of interest The authors declare that they do not have conflict of interest.

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An unusual case of diffuse Merkel cell carcinoma successfully treated with low dose radiotherapy.

Merkel cell carcinoma (MCC) is a rare and highly aggressive neuroendocrine carcinoma of the skin. MCC should be included in the diagnosis of a rapidly...
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