Integrating the concept of field cancerization in the classification and risk assessment of cutaneous squamous cell carcinoma: proposal for a new classification and terminology of keratinocyte skin cancer.

The term keratinocyte skin cancer (KC) stands as an umbrella for different stages within the progression of cutaneous squamous cell carcinoma (cSCC). 1‐2 Its earliest form is named actinic keratosis (AK), while for the in‐situ form different synonyms, namely intraepidermal carcinoma (IEC), Bowen's Diseases (BD) and cutaneous squamous cell carcinoma in situ [cSCC(Tis)] or intraepithelial squamous cell carcinoma (iSCC) are used.3 Instead, cSCC is histopathologically classified into well, moderately and poorly differentiated subtypes.