A federal appellate court has upheld a lower court ruling dismissing the first product liability lawsuit among thousands alleging British drugmaker AstraZeneca PLC''s antipsychotic drug Seroquel triggered a patient''s diabetes, according to the Associated Press. A three-judge panel of the 11th Circuit Court of Appeals ruled Tuesday that the U.S. District Court for the Middle District of Florida had correctly dismissed the case brought by Linda Guinn, a former legal secretary from Palm Bay, Fla., in her early 60s. Before that case was to go to trial, AstraZeneca successfully argued in January 2009, before District Judge Anne Conway, that Guinn''s doctor did not qualify as an expert under federal court rules and so her testimony should be excluded. The drugmaker also persuaded the judge to grant a summary judgment motion in its favor, arguing that Guinn failed to establish that Seroquel caused her diabetes. The 11th Circuit Court, based in Atlanta, upheld those decisions.