TK1 and breast cancer: These five genes were already reported to be up-regulated in breast cancer [5,6,7,8,9,10,11,12,13], and they encode for HSP90AB1 (the beta member of the HSP90 family of heat shock proteins—HSP), VIM (vimentin, a type III mesenchymal intermediate filament), CSNK2B (casein kinase 2β), YWHAB (a member of the 14-3-3 family of proteins), and TK1 (thymidine kinase 1).