By Jason Mast
May 11, 2026
Jason Mast
jason.mast@statnews.com
Jason is a general assignment reporter, with particular focus on genetic medicine and rare disease. Confidential tips can be sent on Signal at JasonMast.77.
Some boys had astonishing recoveries. But other boys died. Now Astellas is returning to revised gene therapy for XLMTM.
By Jason Mast
May 11, 2026
Jason Mast
jason.mast@statnews.com
Jason is a general assignment reporter, with particular focus on genetic medicine and rare disease. Confidential tips can be sent on Signal at JasonMast.77.

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Grace Science CEO Matt Wilsey says FDA demands could kill its gene therapy for the rare and fatal NGLY1 deficiency by September…