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United Therapeutics’ earnings soar (access required)

United Therapeutics Corp., of Silver Spring, a specialty drug maker that develops and markets treatments for unmet medical needs of patients with chronic and life-threatening conditions, reported first-quarter net income totaled $137.5 million, or $2.43 per diluted share, an increase of more than 120 percent compared to the $62.3 million, or $1.19 per diluted share, reported in the prior-year period.