Xoma Hit on Pulled Drug Study

Raptiva wasn't working against rheumatoid arthritis.
By TSC Staff ,

Shares of Berkeley, Calif., biotech

Xoma

(XOMA) - Get Report

fell sharply in the premarket session after phase II tests studying Raptiva as a rheumatoid arthritis treatment were ended by it and

Genentech

(DNA)

.

The studies were called off after showing Raptiva was having no overall clinical benefit in arthritis patients receiving it. The treatment continues to be evaluated by the FDA as a treatment for psoriasis.

Xoma was recently off 55 cents, or 10%, to $4.90 on Instinet.

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