[epistasis]

Right, which is what makes this visualization not interesting. If the comparison had been between TCGA cohort characteristics and the cancer population characteristics, that would be far more interesting.

Even weighting the tissue types by actual incidence rather than number of samples would be far more interesting.

I was one of (many many many) co-authors on several TCGA consortium papers, so I'm quite familiar with it, and with the challenges going forward, but this visualization addresses none of those challenges.