PharmaEssentia Corp (藥華醫藥) shares have jumped 80.56 percent since the company obtained a US polycythemia vera (PV) drug license for its new interferon drug Besremi (ropeginterferon alfa-2b-njft) on Nov. 12. Shares on Friday closed at NT$195 in Taipei trading, up from the stock’s closing price of NT$108 on Nov. 12. PV is a rare, chronic and life-threatening blood cancer linked to a stem cell mutation in the bone marrow that results in an overproduction of blood cells and places sufferers at risk of having a blood clot, stroke or heart attack. PharmaEssentia is preparing to make Besremi available in the US in the