Tumor cyclooxygenase-2 levels correlate with tumor invasiveness in human hepatocellular carcinoma

Figure 2 Boxplots showing significantly higher tumor COX-2 levels in patients with advanced tumor stage (III and IVA) compared with those with early tumor stage (I or II) (P = 0. 008). The upper and lower horizontal lines of the box indicate the 25^th and 75^th percentiles, respectively. The lines within the box indicate the median values. The upper and lower horizontal bars indicate data within 1.5 times the interquartile range.