SOUTH SAN FRANCISCO, Calif., Nov. 15, 2010 /PRNewswire-FirstCall/ -- diaDexus, Inc. (OTC Bulletin Board: DDXS), a diagnostics company focused on the development and commercialization of patent-protected in vitro diagnostic products addressing unmet needs in cardiovascular disease, today announced financial results for the third quarter of 2010. Total revenues for the 2010 third quarter at $3.2 million represented a 26% growth over total revenues of $2.5 million for the third quarter of 2009. Net cash used in operating activities for the third quarter of 2010 was $2.2 million.
Year-to-date revenues for the period ended September 30, 2010 were $8.5 million vs. $8.8 million in the same period a year ago, a decrease primarily attributable to lower product sales due to a related party's reduced clinical trials testing. Revenues were also impacted by the previously disclosed voluntary withdrawal of the PLAC TIA Test in May 2010, one of the two formats of the PLAC Test. Cash and short term investments at September 30, 2010 were $23.2 million compared to $4.8 million at December 31, 2009. The increase is primarily a result of the reverse merger transaction with VaxGen, Inc. completed July 28, 2010, from which diaDexus obtained $23.4 million in cash and equivalents held by VaxGen, partially offset by the repayment of debt and cash used in operating activities.
Commenting on the financial results, Chief Executive Officer Patrick Plewman stated, "We are pleased to report good growth despite the lower related party sales and the voluntary withdrawal of the PLAC TIA product. We believe we have addressed the root cause of the PLAC TIA product performance issue, and a new 510(k) for an enhanced PLAC TIA product was submitted to the FDA on June 30, 2010." Mr. Plewman also commented, "The PLAC test provides valuable information, over and above traditional risk factors, such as