The paper
They don't go into detail about how the Roundup is exposed. In previous studies, they use adjuvants to help with delivery, which can increase toxicity. But they say nothing in this paper. They also don't control dietary intake. What if GM corn is tastier and they're eating more? Or less?
Furthermore, they observe the same health effects in the roundup group, the GM corn group, and the GM+R (both) group, AND these effects are not dose-dependent. Combine this with the small sample size, and the fact they're using a tumor-prone rat breed, you have a paper that's going to be crucified by peer review.
As of today, there is no citation for this paper by
Food and Chemical Toxicity which means... I don't know. But it hasn't been published yet. Was this leaked during peer review process?
This stinks and everyone should withhold judgement.