To the Editor In an Original Investigation titled “Validating 4 Staging Systems for Cutaneous Squamous Cell Carcinoma Using Population-Based Data: A Nested Case-Control Study,”1 published in the April issue of JAMA Dermatology, we present results of a population-based, nested case-control study assessing the usefulness and validity of 4 staging systems for cutaneous squamous cell carcinoma (cSCC) in nonselected patients. In this study with 184 patients drawn from a nationwide cohort of 6721 patients with cSCC, we categorized patients with or without metastasis based on available information on risk factors. We realize that some patients potentially could have been categorized in a higher risk category if more data on variables necessary for accurate staging had been available, as pointed out by concerned readers of JAMA Dermatology.2
Roscher I, Falk RS, Vos L, et al. Notice of Retraction and Replacement: Roscher et al. Validating 4 Staging Systems for Cutaneous Squamous Cell Carcinoma Using Population-Based Data: A Nested Case-Control Study. JAMA Dermatol. 2018;154(4):428-434. JAMA Dermatol. 2018;154(12):1488–1489. doi:10.1001/jamadermatol.2018.4023
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