MGMT and cancer: Lee et al. compared the two methods of qualitative MSP and quantitative pyrosequencing to assess the methylation alteration of MGMT (O6-methylguanine-DNA methyltransferase), RASSF1A (RAS association domain family 1A), RARb2 (retinoid acid receptor h2) and E-cadherin genes in human salivary gland carcinoma (SGC) samples as well as five cancer cell lines [25].