Perhaps I'm misunderstanding the numbers ("OR, 0.93"), but the new study observed a 7% decrease in cancer mortality, which they called "not significant".

No, that's correct. If you want to use stuff that doesn't reach significance, I can't stop you. (You didn't reply to Yvain's points, incidentally.)

Last year, I told you that polio had no natural reservoirs, and you continued to believe otherwise, so I am not especially inclined to argue further.

And you misunderstood the point about carriers defeating eradication attempts.