mRNA levels of proliferation markers in GAS2-overexpressed SW480 cells. Relative value of mRNA levels was indicated at bar top. SW480-C3, SW480 cells with pEGFP C3; SW480-C3.GAS2, SW480 cells with GAS2-contained pEGFP C3. PCNA, proliferating cell nuclear antigen; Ki-67, Ki-67 antigen; GAPDH, glyceraldehyde-3-phosphate dehydrogenase; GAS2, growth arrest-specific-2. SW480, ATCC CCL-228. *P<0.05.