Study information and QC measure summary.

MIAME information was available for all study Studies were downloaded from Gene Expression Omnibus (http://www.ncbi.nlm.nih.gov/geo/). All studies were carried out on Affymetrix platforms. Lesional and Non-Lesional sample count is shown. Stars in table indicate non-statistical significance of QC measures. Study no 6 was already excluded by sample filtering by arrayQualityMetrics. Other studies had high quality and no outlier study was present. IQC: Internal Quality index, EQC: External Quality index, CQCg and CQCp: Consistency Quality Control indexes, AQCg and AQCp: Accuracy Quality Control indexes, NL: non-lesional sample count, L: lesional sample count.