CDKN2A and Barrett esophagus: To explore its potential utility in the diagnosis and risk stratification of dysplasia in BE patients, several studies, all conducted at Mayo Clinic, utilized a 4 locus-specific probe set targeting 8q24 (MYC), 9p21 (CDKN2A; alias P16), 17q12 (ERBB2; alias Her-2/neu), and 20q13 (ZNF217)7,63–67.