select mutants specific to tumor sample in a tumor/normal pair

I am wondering if it would be okay to use the "SelectVariants" tool to select mutants specific to the tumor sample in a pair of tumor and normal samples. I tried the following command, and it seems working. But I am suspecting whether it differentiates the genotype differences (e.g. 0/1 in tumor sample and 0/0 in normal sample) or coverage differences (e.g. 0/1 in tumor sample and ./. in normal sample).

Could someone help me understand "SelectVariants" for my question? Thanks a lot!

java -Xmx10g$tempSpillFolder -jar $CLASSPATH/GenomeAnalysisTK.jar \
-R $GenomeReference \
-T SelectVariants \
--variant $file \
-o $OutputFolder/$filename.selected.vcf \
-select 'set=="tumor"'
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