I want to download the data(unaligned reads) of BTCA-JP. There are about 20000 FASTQ files from 230 donors. However, I found that the specimen type of all files is Primary tumor - solid tissue, which means there is no sequencing data from matched normal tissue / blood. With only the sequencing data of tumor, I can do nothing…(e.g. identify somatic SNV, somatic CNV,).
So I want to know the reason for lacking data from normal tissue. Does ICGC have these data but I have not found them?