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An expert discusses the detection of circulating tumor DNA (ctDNA) prior to surgery, noting higher detection rates in stage III patients compared with stage IIB/C patients, and its significant association with a greater number of involved lymph nodes, extracapsular extension, and clinically evident disease, while also highlighting that all 6 patients with ctDNA detected during the surveillance period developed recurrent melanoma. The expert also provides an overview of the 40-gene expression profile (GEP) test for squamous cell carcinoma (SCC) risk stratification and discusses its utility.
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