In detail, meta-analysis of the DNA methylation microarrays showed that NTSR1 (P = 5.4 × 10-15), SLC5A8 (P = 5.9 × 10-9), GALR1 (P = 9.9 × 10-10) and AGTR1 (P = 6.7 × 10-5) were significantly hypermethylated in NSCLC, whereas ZMYND10 (P = 6.2 × 10-20) was significantly hypomethylated in NSCLC (Additional file 1: Figure S3). This evidence concerns the gene GALR1 and non-small cell lung carcinoma.