Russia won't be importing any genetically modified US corn from Monsanto for a while, after a new study suggested it raised the risk of cancer, reports the St. Louis Post-Dispatch. Monsanto is calling the French study bogus and said the safety of its NK603 corn is "well established." Russia's consumer watchdog agency, Rospotrebnadzor, acted after researchers at the University of Caen said rats that ate the corn were more likely to get cancer and die prematurely. The watchdog agency asked government scientists to review the validity of the study, and health authorities in Europe will do the same. In the meantime, the ban stays in place.