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Arena's heart-lung drug meets main goal in mid-stage study

July 10 (Reuters) - U.S. drug developer Arena Pharmaceuticals Inc said on Monday its experimental drug for pulmonary arterial hypertension (PAH), a rare but deadly lung disease, met the main goal in a mid-stage study.

PAH occurs when the arteries of the lungs constrict, forcing the heart to work harder and potentially leading to heart failure. Its symptoms include shortness of breath and fatigue.

The disease has no cure, but there is an arsenal of U.S. Food and Drug Administration-approved drugs used to manage the condition. However, experts believe those drugs merely reflect the tip of the...