http://dx.doi.org/10.1016/j.fct.2012.08.005
And here is the 12 min Youtube vid done as a sort of doco. It's good and accessible for non-specialists like myself (though the paper is surprisingly accessible too)
https://www.youtube.com/watch?v=Njd0RugGjAg
And here is a figure from the paper
These are results for mortality of rats due to eating gentically modified corn (top 2), genetically modified corn which was treated with roundup (it is roundup resistant, so the point is to kill the weeds, not the corn!) (middle 2) and Roundup only (bottom 2).
Dashed line is the control group (given non-GMO corn which is the closest relative to the GMO corn used), and then the other lines are different amounts of their diet (11%,22%,33%) GMO corn, or different amounts of roundup put in their drinking water.
So both roundup and GMOs cause alarming, gigantic tumours and eventually death.
The deaths don't kick in until about month 4 for rats, and the studies done by Monsanto (the biggest food producer in the US, I don't think you can eat a single thing in the US without them supplying some part of the 'food', even Coke I'm pretty sure is full of corn syrup) were only ever for 3 months. Whether this is a coincidence or not, nobody knows.
Ally and I have often wondered what would happen if Monsanto suddenly ceased trading. They modify their seeds so that their crops don't produce reproducible seeds. This means farmers must re-buy seed from them each season. I think if they shut down, many many people would starve in the short term. They're the Google of food, if not bigger, and yet Google seem to be, as far as I can tell at least, fairly benevolent. There's a nice XKCD on Google's power/benevolence
http://xkcd.com/792/
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