In particular, 5-aza-2′-deoxycytidine (Dacogen or Decitabin) and 5-aza-cytidine (Azadine or Vidaza) can lead to RASSF1A promoter demethylation and the reactivation of RASSF1A expression in diverse types of tumor cells [62, 93–95]. The gene discussed is RASSF1; the disease is neoplasm.