aCGH: array comparative genomic hybridization FFPE: formalin-fixed paraffin-embedded MCC: Merkel cell carcinoma MCpV: Merkel cell polyomavirus PET/CT: positron emission tomography/ computed tomography SLNB: sentinel lymph node biopsy INTRODUCTION In the United States, the incidence and mortality rates for Merkel cell carcinoma (MCC) have more than tripled in the last 2 decades. The main risk fa...