IGF1 and oral lichen planus: Interestingly, IGF1 mRNA expression in female OLP patients was obviously increased than that in female controls (OLP versus control: 2.43 ± 0.45 versus 0.64 ± 0.18, p = 0.042) (Figure 4(a)). IGF1 mRNA expression in female OLP patients was also higher than that in male OLP patients (Female OLP versus Male OLP: 2.43 ± 0.45 versus 0.98 ± 0.36, p = 0.024) (Figure 4(b)).