 In 2010, work began in the only classroom of the "outstanding" medical school, to describe why the doctor in charge had such weird symptoms attributed to his unusual tumor.Almost one year later, DLD/NP1 gene was identified and found repeatedly in Davis' DNA.DNA methylation of a CpG island near the DLD/NP1 promoter as well as histone acetylation may represent possible epigenetic mechanisms leading to decreased gene expression in human tumors.