Somatic mutations in dbsnp--constant 5%

[LiLin]

The number of Somatic mutations in each cancer type or in each person may range a lot, but the number in dbsnp is comparative. Exome sequencing almsot <10 and Whole genome sequencing 50<x<200. I think this is very interesting, that there are some potential common mechanisms in cancer. But I don’t have enough power to research it. Is there anyone can give me some suggestions?

sorry for making a mistake