[gww]

Grails test isn't for somatic mutations but cancer specific DNA methylation patterns. DNA methylation is slightly more challenging to work with due to how the methylation is identified from sequencing data. There's a chemical of enzymatic step to convert unmethylated bases to another base. In humans it's usually unmethylated cytosines to thymines. The analysis is also more complicated but mostly standard now. Nonetheless, DNA methylation has proven to be very useful for liquid biopsies.