Table 2. Five Previously Used Competing Merkel Cell Carcinoma Staging Systems

First AuthorPublication Date Institution(s)No. of Patients in Case SeriesDates of Cases
Yiengpruksawan et al.[2]1991 MSKCCa771969–1989
Allen et al.[3]1999MSKCCa1021969–1996
Allen et al.[4]2005MSKCCa2501970–2002
American Joint Committee on Cancer[5]2002N/AN/A
Clark et al.[6]2007Westmead Hospital, Sydney, Australia110
Princess Margaret Hospital/University Health Network, Toronto, Canada
Sydney Head and Neck Cancer Institute/Royal Prince Alfred Hospital, Sydney, Australia

MSKCC = Memorial Sloan Kettering Cancer Center; N/A = Not applicable.

aThe MSKCC system has evolved over time. MSKCC authors have published one additional case series with 256 patients.[1]

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