(Reuters) – The U.S. Food and Drug Administration approved GlaxoSmithKline Plc’s Tanzeum injection for treating adults with type 2 diabetes, in combination with diet and exercise. Tanzeum will carry a warning on its label that tumors of the thyroid gland were observed in rodent studies with some drugs belonging to the same class. However, it is unknown whether Tanzeum causes thyroid C-cell tumors, the FDA said on its website. It also asked the company to identify any increase in medullary thyroid cancer cases related to Tanzeum.