Tiny Si­en­na is call­ing in Cowen as shares con­tin­ue to lan­guish long af­ter a se­vere tri­al set­back

With its cash re­serves shrink­ing and its stock stuck in pen­ny stock ter­ri­to­ry, tiny Si­en­na Bio­phar­ma­ceu­ti­cals is bring­ing in Cowen to ex­plore what kind of …

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