According to this article in Science News , research on one treatment method being considered by the ACCORD project (Action to Control Cardiovascular Risk in Diabetes) has been stopped by The National Heart, Lung, and Blood Institute (NHLBI) of the National Institutes of Health. This reasearch, which ended 18 months early, ceased due to safety concerns.

To quote from the article: The ACCORD trial was designed to determine whether intensively lowering blood sugar would reduce the risk of cardiovascular events such as heart attack, stroke, or death from cardiovascular disease, specifically in people with type 2 diabetes who are at particularly high risk for a cardiovascular event. Prior studies suggested that reducing blood sugar to levels found in non-diabetic adults may reduce the rate of cardiovascular diseases among those with diabetes. However, a randomized clinical trial was needed to determine whether that hypothesis is accurate.

However, participants who underwent the most intensive treatment and achieved the lowest overall blood sugars also experienced higher levels of mortality — obviously never good news! After review, the patients who were receiving intensive treatment have been switched over to less intensive regimes, and the ACCORD study continues.