Management of Merkel cell carcinoma: case series of 36 patients

Merkel cell carcinoma is a rare, highly malignant skin tumor with a predisposition for local, nodal and distant recurrence which should be managed in a multimodal approach. Here, we performed a retrospective analysis of 36 patients, treated from 1984 to 1994. In patients with stage I disease, locoregional recurrence after surgery alone occurred in 65% compared to 43% after excision and adjuvant radiotherapy. Although the difference in disease-specific survival was not significant (67% versus 52% at 5 years), combination therapy conferred a benefit for locoregional control and relapse-free survival (88 versus 58 months). The majority of failures (54%) occurred within the draining lymph nodes that were not treated in the initial approach and locoregional recurrence was strongly associated with a later systemic relapse (50% versus 0%). Salvage after localized recurrence was achieved in 67% of resectable cases. The high rate of nodal recurrence after surgery alone warrants the use of elective nodal treatment in patients with stage I disease. Surgical resection of the primary tumor should be followed by postoperative radiotherapy to the primary site and draining lymph nodes. Even after locoregional recurrence, a substantial proportion of patients is able to achieve long-term disease-free survival, particularly after complete resection and adjuvant irradiation.