The Cancer Genome Atlas (TCGA), a landmark cancer genomics program, molecularly characterized over 20,000 primary cancer and matched normal samples spanning 33 cancer types. These preloaded datastets contain expression matrices for mRNAseq TCGA samples as processed by The Broad GDAC Firehose. Each matrix contain log2 transformed "scaled_estimate" (RSEM) values from Illumina HiSeq/GA2 mRNAseq level_3 (v2) TCGA datasets.