gene expression Article 66 controlled study 61 human 56 real time polymerase chain reaction 50 Humans 49 genetics 48 male 41 female 40 adult 35 unclassified drug 34 Female 33 Male 32 metabolism 32 major clinical study 29 gene expression regulation 26 upregulation 26 middle aged 25 nonhuman 25 Middle Aged 23 human cell 23 pathology 23 protein expression 22 human tissue 20 Gene Expression Regulation, Neoplastic 18 Western blotting 18 case control study 18 down regulation 18 long untranslated RNA 17 microRNA 17