 handle on which of these cancers are going to go on to be lethal and which ones aren't. And I use the example of prostate cancer. There are sort of tigers and kittens. The tigers in prostate cancer will kill you, and they're relatively rare. But if you have one of those, you certainly want to treat it and be aggressive to improve the chances of survival. But most prostate cancers are diagnosed at a relatively early indolence stage, and they'll never go on.