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The Boston Globe

Business

Ariad curtails leukemia drug trial on clot risk

Shares of Ariad Pharmaceuticals Inc. tumbled nearly 66 percent Wednesday after the Cambridge biotechnology company said it stopped enrolling patients in ongoing clinical trials of its leukemia drug because new data showed an increased number suffered blood clots and heart problems in an earlier study.

Food and Drug Administration regulators ordered a “partial clinical hold” on Ariad’s trials until the fast-growing company changes its clinical study doses and eligibility rules and the FDA updates a warning label for the drug, called Iclusig, which was approved for US sale last December and remains on the market.

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