An early proof-of-concept study shows promising results for imatinib in the treatment of pulmonary arterial hypertension (PAH), a severe, incurable blood vessel disorder. Preliminary findings from a 59-patient, multi-center Phase II clinical trial suggest imatinib provides a treatment benefit, as demonstrated by a significant improvement in pulmonary vascular resistance and a numerical increase in cardiac output, key hemodynamic measures used to monitor the progression of the disease. Improvements in the six-minute walk test, the primary endpoint of the study, approached, but did not reach, statistical significance.
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