Abstract
The study by Sharief and Hentges (Aug. 15 issue)1 provides evidence that cerebrospinal fluid levels of tumor necrosis factor-α are higher in patients with chronic progressive multiple sclerosis than in patients with stable disease and that cerebrospinal fluid levels of tumor necrosis factor-α are correlated with disease progression in chronic progressive multiple sclerosis. On the basis of these results the authors suggest that tumor necrosis factor-α has a role in the progression of multiple sclerosis. We believe that the authors should provide additional information concerning the HLA Class II typing of the patients studied, for the following reasons.

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