For some tumour samples methylation levels of GRIA4 (2/10 samples) or VIPR2 (2/10 samples) were similar to their respective normal samples, while in other cases, methylation of GRIA4 (2/10 samples) and VIPR2 (1/10 sample) was not detectable, probably due to the low content of tumour cells in these tissue samples. Here, VIPR2 is linked to neoplasm.