GAPDH and lung cancer: Likewise, Western blot analysis showed that S100A15 protein expression was significantly increased in the three lung cancer cell lines with high metastasis potential (S100A15/GAPDH ratio: CL1-5, 1.11L0.08, p=0.001; PC9, 1.03±0.03, p=0.002; H1975, 1.12±0.06, p<0.001) as compared with that in CL1-0 cell line (0.66±0.11, Figure 3C).