The impairment charge during the three months ended December 31, 2007, was primarily related to an other-than-temporary decline of our investment in ViRexx Medical Corp. due to the unsuccessful results of our IMPACT I and II Phase III clinical trials of OvaRex in advanced ovarian cancer.
Stock option expense increased during the three-month and twelve-month periods ended December 31, 2007, over the same periods in 2006, primarily as a result of a stock option grant to our Chief Executive Officer based on the 89% increase in our share price during 2007.
Interest Income. Interest income for the year ended December 31, 2007, was $13.6 million, as compared to interest income of $10.7 million for the year ended December 31, 2006. The difference was due primarily to an increase in market interest rates and amounts available to invest. Interest income for the three months ended December 31, 2007, was comparable to interest income for the same period in 2006.
Income Tax Benefit. We recognized an income tax benefit of approximately $3.3 million and $34.1 million for the years ended December 31, 2007 and 2006, respectively. For the three-month periods ended December 31, 2007 and 2006, we recognized a tax benefit of $7.1 million and $47.7 million, respectively. The tax benefit recognized for 2007 was primarily due to the amount of tax credits generated during the year from our orphan drug related research and development activities. For the year ended December 31, 2006, the tax benefit recognized was primarily due to a reduction of approximately $45.7 million in the valuation allowance against most of our deferred tax assets based on our determination that certain portions of these deferred tax assets are more likely than not realizable.
|SOURCE United Therapeutics Corporation|
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