Keryx Biopharmaceuticals (KERX) stunned the market yesterday after releasing positive phase 3 data for its hyperphosphatemia drug Zerenex. Shares jumped around 75% after the news was released, and investors are still enjoying the newfound optimism surrounding this biotech company. Shares hopped another 40% today, but what caused this additional jump? What should investors watch for going forward? In this video, health care analyst Max Macaluso dives into these questions.