Correlation analyses revealed that the methylation status of RASSF1A positively correlated with that of HIN-1 and MGMT. In addition, we found a statistically significant positive correlation between the promoter methylation of DAPK1 und MGMT. Correlation between methylation levels of RASSF1A and HIN-1 in tumor of breast cancer patients has been previously published by Feng et al. Here, RASSF1 is linked to breast cancer.