Figure 2: Effect of UGT1A1 mRNA expression in human breast samples on ethnicity, menopausal status, and stage of breast disease. Quantitative real-time PCR analysis of UGT1A1 mRNA expression in normal (N) and tumor (T) human breast tissues and its effect on ethnicity (A), menopausal status (B), and stage of breast disease (C). Solid horizontal lines demonstrate the mean with the 95% CI of each individual group. All data are shown as the ratio between the UGT target gene and B-actin internal control on a logarithmic scale. p -value, nonparametric, Mann-Whitney or Kruskall-Wallis tests. *p < 0.05 is statistically significant.