Rigel Pharmaceuticals Inc. has produced positive Phase III data with the platelet drug fostamatinib in chronic/persistent immune thrombocytopenia, putting the oral spleen tyrosine kinase (SYK) inhibitor on footing for a potential approval after the company failed to successfully develop the drug in rheumatoid arthritis.
The South San Francisco, California company reported results from the first of two identical trials in Rigel's Phase III FIT...