Shares in Xoma Corp. erased most of their value Wednesday after the company said its eye drug failed in a late-stage study.

In premarket trading, shares plunged 81% to 85 cents.

Xoma developed the drug, gevokizumab, to treat patients with Behç et's disease uveitis, which can lead to permanent vision loss. According to Xoma, Behç et's disease is one of the most severe forms of uveitis, or chronic inflammation of blood vessels in the eye.

Gevokizumab is the only drug in Xoma's pipeline.

The company, together with French partner Servier, enrolled 83 patients in its Eyeguard-B study. The primary endpoint, which the drug didn't meet, was the time to first acute ocular exacerbation.

Secondary endpoints included total number of exacerbations, best corrected visual acuity and vitreous haze, among other things. Xoma called observations seen in the secondary endpoints "clinically important" and said it would conduct further analysis on the data.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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