Rigel Mulls Next Steps After Fostamatinib Fails In Kidney Disease

Rigel sees positive signs for Tavalisse in failed mid-stage study in autoimmune nephropathy, but investors don't share the optimism, sending the stock down almost 14% on the news.

Human Kidneys, 2d rendering

Rigel Pharmaceuticals Inc. sees positive signs in a failed Phase II study of its spleen tyrosine kinase (SYK) inhibitor Tavalisse (fostamatinib) and says it will consider next steps for development with potential partners.

The company reported topline data on April 3 from a Phase II study evaluating fostamatinib in immunoglobulin A nephropathy (IgAN), an autoimmune disease of the kidneys that progresses to end-stage renal failure

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