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But denosumab is a first-in-class drug: It's a biologic, which means it will likely be much more expensive than its competitor drugs, some of which are available as cheaper generics. The drug also boasts an extremely convenient dosing regimen -- subcutaneous injection every six months.
It is sold for that purpose under the name Prolia. Sales so far have been slow. But the use for cancer patients might be more lucrative for Amgen because cancer patients would use 12 times as much of the drug a year than osteoporosis patients do. Sales could easily surpass $1 billion a year, some analysts estimate.