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The Boston Globe

Business

Positive trial results boost Vertex

Shares of Vertex Pharmaceuticals Inc. soared more than 55.5 percent in after-hours trading on the Nasdaq stock market Thursday after the Cambridge biotechnology company released positive clinical data on an experimental cystic fibrosis treatment.

Vertex said a midstage study of its VX-661 drug candidate in combination with its approved cystic fibrosis drug Kalydeco “showed statistically significant improvements in lung function” in adult patients.

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