GAB2 and hepatocellular carcinoma: HepG2 cells have a nice growth curve (Fig. 3A, black and blue lines); however, the number of EGFP-Gab2 cells was markedly higher than that of EGFP cells on d 2 and 3 (Fig. 3A, red and brown lines), which suggested that Gab2 overexpression enhanced HCC cell growth rate.