Democrats from the House Committee on Oversight and Government Reform have sent letters to seven drugmakers as part of an investigation into why prices for multiple sclerosis drugs have nearly quadrupled since 2004.

Reps. Elijah Cummings (D-Md.) and Peter Welch (D-Mass.) penned inquiries to Bayer, Biogen, EMD Serono, Novartis, Roche, Sanofi-Aventis and Teva Pharmaceuticals.

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