Bio­gen, Ei­sai fight back against ac­cu­sa­tions their big BAN2401 study was skewed -- but this fight is­n't over yet

Af­ter get­ting slapped hard by crit­ics for the way it han­dled their re­cent tri­al sum­ma­ry for their Alzheimer’s drug BAN2401, Ei­sai and their part­ners at Bio­gen $BI­IB turned up at an Alzheimer’s con­fer­ence in Barcelona to present their de­fense of the da­ta af­ter crunch­ing the num­bers again. But it’s not play­ing their way, with Bio­gen’s stock slid­ing as key an­a­lysts re­fused to for­give or for­get.

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