Lackluster Fostamatinib Results Prompt AstraZeneca To Drop Rigel Deal

Disappointing Phase III results have pushed AstraZeneca to end yet another partnership, leaving Rigel in a tough spot as the biotech considers how to move forward now that its largest partner has jumped ship.

The future of Rigel Pharmaceuticals Inc.’s pipeline looks precarious now that its partner AstraZeneca PLC has chosen to return worldwide licensing rights of the rheumatoid arthritis candidate fostamatinib back to the biotech. The decision comes on the back of lackluster Phase III results for the drug, but Rigel isn’t throwing in the towel yet.

Rigel and AstraZeneca announced June 4 that fostamatinib, an oral spleen tyrosine kinase (SYK) inhibitor, showed mixed results in two...

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