MGMT and pulmonary alveolar proteinosis: The results indicate a positive correlation between Pap grade and promoter methylation of ADCY8, CDH8, and ZNF582 (Spearman’s rank, p < 0.05) but not MGMT. Pairwise comparison of methylation at each CpG locus between Pap grades revealed higher levels in HSIL than LSIL and NILM with a few exceptions (Fig. 3a).