Amgen 1Q13 1Q Revenues: $4.2 billion (+5%) 1Q: Earnings: $1.4 billion (+21%) Comments: Sales growth was driven by Enbrel ($1.0 billion/+11%), Xgeva ($223 million/+46%), Prolia ($142 million/+61%) and Sensipar (+$264 million/+21%). Enbrel’s increase was attributable mainly to increased prices and a change in accounting estimates, offsetting a small drop in demand. Epogen sales fell 2% to $435 million and Aranesp dropped 10% to $468 million. Neupogen sales fell 2% due to reduced demand. R...