Biogen’s stock rose 1% Thursday, after Europe’s pharmaceutical regulator issued a positive opinion on the Alzheimer’s disease drug that the company developed with Japanese partner Eisai — reversing an earlier decision not to approve the drug.

The European Union's drugs regulator on Thursday recommended approval of Eisai and Biogen's Leqembi for some patients with early Alzheimer's disease, reversing its initial decision from four months ago.

Reversing an earlier decision, European regulators recommended that an Alzheimer’s therapy from Eisai and Biogen should be approved.