diaDexus, Inc. announced that on January 5, 2015, Alexander Johnson, President of the company resigned from the company effective January 5, 2015. On January 5, 2015, the company announced that Lori Rafield, Ph.D, Chair of the Board of Directors, will be appointed as Interim Chief Executive Officer, effective January 5, 2014. Dr. Lori Rafield, chairman of the Board of Directors, has been appointed to serve as the company's interim chief executive officer in driving diaDexus' evolution into a multi-product company and enabling the execution by the new leadership team.