I'm interested in using TCGA data to look at the frequency of somatic mutations in genes for a particular cancer (Ovarian). Because my scripting skills are "OK" at best and I've struggled to get what I want out of .maf files, I followed advice given in this post (A: Retreiving Data From Tcga Database) and decided to get my data from ICGC's website instead of TCGA.
I'm confused about the completeness of the TCGA data available through ICGC. On ICGC's website (https://dcc.icgc.org/projects?filters=%7B%22project%22:%7B%22id%22:%7B%22is%22:%5B%22OV-US%22%5D%7D%7D%7D), there are apparently 582 participants of TCGA's Ovarian cohort and there are simple somatic mutation data available for only 88 of these participants. Contrast that with TCGA's (https://tcga-data.nci.nih.gov/tcga/tcgaCancerDetails.jsp?diseaseType=OV&diseaseName=Ovarian%20serous%20cystadenocarcinoma) which has apparently 586 participants and... I'm not sure how many participants for which there is somatic mutation data.
Are there really only 88 participants out of over 500 that show somatic mutations?