The feature selection. The filtering process of feature selection. The goal of feature selection is to detect features associated with PFS and gene expression changes but not related with patient ages and tumor stages. As a result, (a) 134 features (genes) were selected from copy number data, and (b) 59 features (CpG sites) were selected from methylation data.
Hsu et al. BMC Genomics 2012 13(Suppl 6):S13 doi:10.1186/1471-2164-13-S6-S13