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1/n Thoughts on Neurofilament Light (NfL) as a neurodegeneration biomarker. I expect to hear a lot on it in the upcoming #Tofersen Adcom. @US_FDA refers to it as a promising biomarker of neurodegeneration in several diseases at the Relyvrio #ALS approval👇@ProfRobHoward @pash22 
2/n This raises an important question- if decreasing NfL levels are associated with clinical benefit outcomes in #ALS, wouldn’t increasing levels associated with worsening clinical outcomes and/or adverse events in #Alzheimer’s be similarly meaningful? Unfortunately these results
3/n have not been published for #aducanumab or #lecanemab. But they have for #donanemab by @LillyPad in phase-2 where accelerated loss of brain volume seen relative to placebo is associated with Increase in NfL levels. Increase in NFL is also significantly associated with faster
