Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

Journal Retracts Study Linking Gene-Modified Corn and Tumors in Rats

A controversial study linking genetically modified corn to tumor growth and increased risk of death in rats has been retracted by the journal Food and Chemical Toxicology.

The study made headlines worldwide after it was published in the Sept. 19, 2012 issue of the journal. It said that rats were more likely to develop large tumors and die early after eating Monsanto's genetically modified corn, whether or not it was treated with a weed killer, CBS Newsreported.

The study is being retracted due to concerns with the research methodology, according to journal published Elsevier, which added that there is no evidence of fraud or intentional misrepresentation.

"This retraction comes after a thorough and time-consuming analysis of the published article and the data it reports, along with an investigation into the peer-review behind the article," Elsevier said in a news release, CBS Newsreported.

"Ultimately, the results presented (while not incorrect) are inconclusive, and therefore do not reach the threshold of publication for Food and Chemical Toxicology," Elsevier said.