HGF and non-small cell lung carcinoma: Moreover, the RT-PCR assay which was used to detect HGF expression levels in the same 63 NSCLC samples showed significant positive correlations when HGF promoter methylation status (MI scores) was plotted against HGF expression levels (2-tailed Spearman's correlation, R = 0.529, P < 0.0001), suggesting that a highly methylated HGF promoter can activate the expression of HGF (Fig. S2).