Box plots of DDR1 expression in AJCC/UICC stages of HCC. The relative expression levels of DDR1 in 23 human HCC tissues categorized according to AJCC/UICC stage I-II and AJCC/UICC stage III-IV are presented. The boxes enclose the interquartile ranges (IQRs), with the median values denoted by the horizontal lines. Circles (ο) represent outliers (values >1.5 × IQR). * p < 0.01 vs. AJCC/UICC stage I-II.