Table 2.

Mean percentage of PCNA expression at baseline and at 3 months in forearm biopsies, AK lesions, and skin adjacent to previous SCC

GroupSamplenMean % PCNA (SE)P*
Group 1: sun-damaged forearm, no sunscreenBaseline3312.8 (1.8)0.0049
3 mo337.8 (1.1)
Group 1: sun-damaged forearm, sunscreenBaseline4311.1 (1.4)0.19
3 mo438.3 (0.9)
Group 2: AK forearmBaseline3012.0 (2.2)0.39
3 mo3012.9 (2.6)
Group 2: AK lesionBaseline2714.7 (2.5)0.32
3 mo2718.9 (3.7)
Group 3: skin adjacent to previous SCCBaseline306.5 (1.0)0.19
3 mo304.7 (1.0)
Group 3: previous SCC forearmBaseline327.3 (1.1)0.13
3 mo329.6 (1.4)
  • * Wilcoxon signed rank test comparing baseline expression with 3 months expression.