Outcome of Combined Treatment of Surgery and Adjuvant Radiotherapy in Merkel Cell Carcinoma.

In recent analyses of Merkel cell carcinoma, prognosis is poor even in stages I and II. We performed a monocentric retrospective study of 37 consecutive cases with Merkel cell carcinoma stage I to III treated with a combination of surgery and adjuvant radiation to evaluate progression-free and overall survival. The median primary tumour diameter was 17.9 mm. Cases consisted of 31 primary tumours, of which 13 had negative sentinel lymph node biopsy (IA n = 10 and IIA n = 3) and 18 no sentinel lymph node biopsy (IB n = 15 and IIB n = 3), 2 tumours with positive sentinel lymph node biopsy (IIIA) and 4 with local macrometastasis (IIIB). The median age was 71 years and the median follow-up was 60.4 months. The 5-year progression-free survival was 83.8% and 5-year disease-specific survival was 95.7% (overall survival 93.0%). So far, our results show a high survival rate with combined treatment of surgery and adjuvant radiotherapy in early tumour stages of Merkel cell carcinoma.