Pfiz­er's big block­buster Xel­janz flunks its post-mar­ket­ing safe­ty study, re­new­ing harsh ques­tions for JAK class

When the FDA ap­proved Pfiz­er’s JAK in­hibitor Xel­janz for rheuma­toid arthri­tis in 2012, they slapped on a black box warn­ing for a laun­dry list of …

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