For a cancer research project some labmates and myself are conducting, I would like to obtain lists of cancer mutations along with their variant allellic frequency (AF) for a wide range of malignancies. Looking at the TCGA, I noticed that the freely accessible MAF file format does not include this data field, but the TCGA VCF standard does list AF as an optional field in the INFO field. The VCF files are all under the restricted access tier, however.
Could someone with access to this data give me an indication of the percentage of TCGA malignancies that include AF in their mutation call files? Any pointers on other ways to find such data would also be appreciated highly!