I am new to RNA-Seq pipelines/analysis and TCGA data. I am trying to identify genes with differential expression between tumor and normal. The ultimate goal is to connect differential expression with copy number alterations in a patient specific manner. I cannot find RNA-Seq data for many normal samples (matched with their corresponding tumor sample) per cancer type. Is it true that there aren't many normal RNA-Seq expression data? If yes, is there any alternative approach to reach the above-described goal?
Thanks a lot in advance.