It’s been a tough year for (AMGN) stock, which has made a recent rally all the more welcome for investors. Expect that trend to continue, predicts Jefferies, which believes the tide is finally turning for the drug maker. Amgen (ticker: AMGN) stock is up less than 5% year to date through Wednesday’s close, compared to a nearly 17% gain for the S&P 500, and a 10% rise for the (IBB) (IBB).