They say it didn't in their test subjects over one year, but to me as a layman this is very weak evidence still: cancer takes time to develop (and framing their

They say it didn't in their test subjects over one year, but to me as a layman this is very weak evidence still: cancer takes time to develop (and framing their result as "260 person-years" as they do is a case of the mythical man-month), and I don't trust drug developers to design and report their trials in an unbiased way. I'd expect increased risk, too.