ABSTRACT
SCC (12). In fact, the overall rate of progression from AK to SCC is low, with the rate of transformation to SCC over the course of a year ranging from 0.01% to 0.24%, and over 10 to 25 years from 5% to 20% (13-16). Spontaneous regression occurs at a rate of 15% to 25% (15). Fifteen percent of lesions that have regressed recur within a year (17).
