We performed an observational retrospective cohort analysis of women with breast cancer with publicly available clinical and primary tumor mRNA expression and mutation data from the METABRIC study. Data was retrieved using the cBioPortal implementation in R, package CGDS-R [25 (link), 26 (link), 70 (link)]. The METABRIC study included over 2,000 fresh-frozen breast cancer specimens and a subset of normal breast tissue from tumor banks in the UK and Canada. The METABRIC study reported 2,136 primary tumors with expression array (Affymetrix U133A microarray) data and 2,433 primary tumors with somatic mutation testing by sequencing for 173 genes. We also analyzed RNA sequencing data for mRNA expression from 1,100 primary breast cancer tumors from The Cancer Genome Atlas (TCGA) to validate our results for differentially expressed genes from the METABRIC study [27 (link)].
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