ICAM1 and psoriasis: In psoriasis involved skin (Table 1), statistically significant positive correlations were found between the expression levels of PNOC and USF1 (r = 0.58, p < 0.05), PNOC and ICAM1 (r = 0.59, p < 0.05) and USF1 and ICAM1 (r = 0.51, p < 0.05).