We know very little about the causes of cancer in the pancreas. And I'm strongly advocating, I mean, I didn't do any of the studies myself, but... in our lab, but I mean, about 20 years ago, I put in a grant application to study cancer of the pancreas and hepatitis B virus, and that... which wasn't successful. But I'd love to see more work done on it. You know, you have human T-cell leukemia, virus 1 and 2, which is fairly common in parts of… it's common in Equatorial Africa. And there's nasopharyngeal carcinoma, which is quite common in Southern Asia. And there's… there’s a tumor associated with, there's several bacterial ones, like cancer of the stomach, you know, they have a connection with pylori bacteria — Helicobacter pylori. And I'm sure, there are many others. And sometimes the connection may… may not be, you know, clear. As I mentioned before, everything has multiple causes. So in some cases, the virus may have some role, but not, you know, there may be other causes as we… but actually, one… one of the things you want in medical research, in particular, is you want complicated answers. You want complex answers, not simple ones, because the more… the more you know about different mechanisms, the more places you can intervene. And that's what's happening in drug therapy now, we know more and more about the molecular biology, that every time some sort of mechanism, it looks as if you could find some small molecule there, that will interfere with it, your… that's your candidate. That goes into the pipeline. You know, you have some idea of mechanism, you have, you know,  a cheap drug you can make, synthesize, and that's your next pipeline. So, what we don't want is simplicity. We want complexity, you know, understand as much as you can, in order to intervene.