Samples with 0% Tumor, but chromosome deletions?

[Timster28]

Hello,

I am using ichorCNA and we have some samples that indicate there is 0% tumor in the sample; however, there is a chromsome deletion in some of them. I can attach them all here if you would like to look at it. The GC-Map corrections are good and the mean coverage is higher than 0.1X. Some of these deletions look very small compared to the entire chromosome, but I'm having a hard time determining if these deletions are significant or not, can someone help?

Thanks,
Tim
UM031C2D25.seg.txt
UM031EndC4.seg.txt
[NWC032C2D15.seg.txt](https://github.com/broadinstitute/ichorCNA/files/1175
CLA038EndC12.seg.txt
0639/NWC032C2D15.seg.txt)