Psoriasin expression relative to lesion type Panel A: distribution of expression within cases with normal skin (N), actinic keratosis (AK), squamous carcinoma in-situ (IS), invasive squamous cell carcinoma (INV), and basal cell carcinoma (BCC). Bars represent medians. All p values were determined by Mann Whitney test. Panel B: comparison of expression within individual cases between areas of squamous carcinoma in-situ (IS) and invasive squamous cell carcinoma (INV). The p value was determined by Wilcoxon Rank Sum test.