Figure 5From: Highly frequent promoter methylation and PIK3CA amplification in non-small cell lung cancer (NSCLC) Association of promoter methylation of these 6 genes with PIK3CA amplification in NSCLC. Methylation levels of the 6 genes are represented as described in Figure 1. '+' indicates tumor samples harbor PIK3CA amplification; '-' indicates lack of PIK3CA amplification. *, P < 0.05.Back to article page