E-GEOD-3492 - Transcription profiling of whole blood from women exposed to hormone replacement therapy and those with no treatment

Submitted on 21 October 2005, released on 28 November 2007, last updated on 4 May 2014
Homo sapiens
Samples (178)
Array (1)
Protocols (2)
The American Women's Health Initiative study published in July 2002 caused considerable concern among hormone replacement therapy (HRT) users and prescribers in many countries. This study is an exploratory research comparing the genome wide expression profile in whole blood samples according to HRT use. Within the Norwegian Women and Cancer study, 100 postmenopausal women (50 HRT users and 50 non-HRT users) born between 1943 and 1949 with normal to high body mass index and no other medication use were selected. After total RNA extraction, amplification and labelling, the samples were hybridized together with a common reference (Universal human reference RNA, Stratagen) to Agilent Human 1A oligoarrays (G4110b, Agilent Technologies, Palo Alto, CA) containing 20,173 unique genes. Differentially expressed genes were used to build a classifier using the nearest shrunken centroids method (PAM). Then, we tested the significant changes in single genes by different methods like t-test, Significance Analysis of Microarrays (SAM) and Bayesian ANOVA analysis (BAM). Results did not reveal any distinct gene list which predicted accurately HRT exposure (error rate = 0.45). Classifier performance slightly improved (error rate = 0.29) including only women who were using continuous combined HRT treatment. According to the small amplitude of expression alterations observed after HRT use in whole blood, large sample sizes are needed to identify significant single genes differentially expressed. However, significant enrichments in biologic process of genes with small changes after HRT use were observed (e.g. receptor and transporter activities, immune response, frizzled signalling pathway, actin filament organization, glycogen metabolism). Experiment Overall Design: Indirect design with Stratagene reference Experiment Overall Design: 47 non HRT users and 42 HRT users Experiment Overall Design: No technical replicates
Experiment types
transcription profiling by array, compound treatment
Gene expression profiling of whole-blood samples from women exposed to hormone replacement therapy. Vanessa Dumeaux, Jostein Johansen, Anne-Lise Børresen-Dale, Eiliv Lund. Mol Cancer Ther 5(4):868-76 (2006)
Investigation descriptionE-GEOD-3492.idf.txt
Sample and data relationshipE-GEOD-3492.sdrf.txt
Processed data (1)E-GEOD-3492.processed.1.zip
Array designA-AGIL-9.adf.txt