Just saying ...

Why do scientists do studies on rats if only to deny results stating something like "this outcome may not be same for humans". If there is no correlation of testing done on rats with similar results for humans then meaning to say we waste massive $$ doing said research for no reason at all?
Do a search on "GMO cause tumors in rats" or "RFR causes tumors in rats" and you will find that those that don't want the result to be true or known will deny the results to the extent of getting scientists to retract their work or try to minimize any direct correlation to similar results for humans.
Just saying ...