There are two issues here.
One issue is that a lot of data that should have been collected is simply not being collected. An independent brain tumour group is starting up a database, but it's not in place yet. In order to detect the oncoming tsunami of brain tumours, should that happen—and it looks as if we may see an increase in brain tumours—we would have to have detailed information about where exactly these tumours are located. There's also an issue with tumours in the salivary gland, and we're not collecting that data at all.
You need to have detailed data on the location and the histology, the actual details—