Chris Anzalone, Arrowhead CEO

Ar­row­head, Take­da liv­er drug head­ed to PhI­II de­spite place­bo re­spon­se's dent on stock

Ar­row­head Phar­ma­ceu­ti­cals re­port­ed Mon­day that its Take­da-part­nered pro­gram re­duced liv­er scar­ring and mu­tant pro­tein lev­els in pa­tients with al­pha-1 an­tit­rypsin de­fi­cien­cy, a rare liv­er dis­ease. How­ev­er, a bet­ter-than-ex­pect­ed place­bo per­for­mance sent shares of Ar­row­head $AR­WR down more than 20%.

The Phase II SE­QUOIA study showed the pair’s RNAi drug can­di­date fazir­sir­an re­duced mark­ers of AATD, a con­di­tion in which the body does not pro­duce enough AAT, a pro­tein made in the liv­er to pro­tect the lungs.

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