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The staff of the Institute for Clinical and Economic Review, or ICER, are known as the nerds of the drug industry: bespectacled killjoys who emerge a few times a year to scold drugmakers for pricing their latest cancer or MS advance far beyond reason.

But last year, they sat down and concluded a forthcoming treatment was worth up to $3.9 million — more than any medicine in history, more than a 45-year supply of Humira, the autoimmune drug often held up as an emblem of America’s runaway drug spending. 

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It was a testament to the power of a new class of gene therapies to deliver something pharma so rarely does: Genuine cures. The treatment, approved last week as Lenmeldy, may allow some babies born with an ultra-rare neurodegenerative disease called metachromatic leukodystrophy, or MLD, to grow up and live essentially normal lives.

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