After applying multiple corrections, a significant difference in the methylation level of BDNF promoter I (p = 0.0023, Mann–Whitney test; E-GEOD-61380 database,) and of BDNF promoter IV (p = 0.0015, Mann–Whitney test; E-GEOD-61107 database) was found between schizophrenia patients and healthy individuals (Table 3). The gene discussed is BDNF; the disease is schizophrenia.