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Amgen's experimental obesity drug demonstrated promising durability trends in an early trial, paving the way for a larger mid-stage study early next year, company officials said ahead of a data presentation on Saturday (December 3). The small Phase I trial found that patients maintained their weight loss for 70 days after receiving the highest tested dose of the injected drug, currently known as AMG133. Amgen shares have gained about 5% since the company said on Nov. 7 that 12 weeks of trial treatment at the highest monthly dose of AMG133 resulted in mean weight loss of 14.5%. At 150 days after the last dose, maintained weight loss had dropped to 11.2% below original weight at the start of the trial, according to findings detailed at a meeting of World Congress of Insulin Resistance, Diabetes and Cardiovascular Disease in Los Angeles. Patients treated with AMG133 did have side effects including nausea and vomiting, but most cases were mild and resolved within a couple of days after the first dose, Amgen said.