Supplementary Figure 3. Correlation between TFAP2E intron 3 methylation and IHC expression. When methylation was analysed as a continuous variable using linear regression analysis, we observed a trend towards negative correlation with IHC protein expression; however, this correlation was significant only when combining lack of and low TFAP2E expression (IHC scores 0 & 1) versus strong TFAP2E staining (IHC scores 2 & 3) (p= 0.015). Linear regression analysis comparing TFAP2E methylation and expression in CRC tissues (N=314) using IHC results by binary scoring system: positive/negative (A) staining scores 0 & 1 vs 2 & 3(B) and the staining intensity scale 0 to 3 (C). Correlation and performance measures between TFAP2E methylation and expression in CRC tissues using IHC and methylation qualitative results (staining scores 0 & 1 vs 2 & 3; (D).