Comment by nextos

6 hours ago

15-20% cancers are caused by viral infections, probably more.

E.g. EBV is strongly associated with several lymphomas.

There are other significant clinical associations for HPV, HBV, HCV, HTLV-1, HHV-8, and many others.

Personally, I suspect it's a lot more. The % of cancers of viral origin feels a lot like a growth curve to me--and growth curves flatten out gently.