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Letters to the Editor
March 2000

How Does One Define Progression of Disease in Patients With Relapsing-Remitting Multiple Sclerosis?

Arch Neurol. 2000;57(3):425-426. doi:

In their article in the November 1998 issue of the ARCHIVES, Rice and Ebers1 raised concerns about the best method for defining disease progression for patients with relapsing-remitting multiple sclerosis (MS) in clinical trials, and they cast doubt on the significance of disability progression as defined in the pivotal interferon beta-1a (IFN-β-1a) (Avonex; Biogen Inc, Cambridge, Mass) trial.2 I would like to comment, in part because I was quoted out of context in the article.

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