Bio­gen shares tum­ble af­ter key ex­ec notes a change­up to piv­otal ad­u­canum­ab study due to 'vari­abil­i­ty'

With news of Mer­ck’s flag­ship BACE drug go­ing down to com­plete fail­ure in a late-stage Alzheimer’s study still re­ver­ber­at­ing through a dispir­it­ed R&D field, Bio­gen is now pitch­ing in to make things even worse.

Shares of Bio­gen $BI­IB tum­bled about 7% Wednes­day af­ter­noon af­ter their CMO Al San­drock shocked some at­ten­dees at the Leerink Health­care Con­fer­ence by say­ing that the com­pa­ny had de­cid­ed to add 510 pa­tients to its piv­otal study for the close­ly-watched drug ad­u­canum­ab.

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