 So far, the astronauts have not had a higher risk of cancer overall. There's been some cases of more rare kinds of cancer that have appeared, but it doesn't seem to be necessarily a long-term risk. And it is a big caveat that we don't have enough samples to really know for sure. It's only really been almost 700 people who've been to space, and about half of them are Russians. We don't have a lot of data on them.