Separately, a poster confirming the clinical utility of Corus CAD in the primary care setting to accurately exclude the diagnosis of obstructive CAD in stable, symptomatic female patients was also presented at the Women's Health Congress. The poster titled, "The Use of a Personalized Gene Expression Test to Improve Decision Making in the Evaluation of Women with Symptoms of Suspected Obstructive Coronary Artery Disease" represents a substudy that included 141 women of a 317 total patient population in this sex-specific analysis led by Michael Conlin, MD, Johns Creek Primary Care. Results showed that Corus CAD scores could reliably separate female patients into elevated risk (score ≥15) and low risk (score ≤15) groups, allowing primary care physicians to more accurately triage patients. Use of Corus CAD led to a reduction in referrals to cardiologists of 77 percent in the low-scoring female patient group (p<0.001).
"With test overutilization contributing to the approximately $5 billion in annual cardiac-related diagnostic costs in this population, primary care providers are concerned with accountable care now more than ever," said Dr. Conlin. "As the symptoms in women are harder to diagnose, they are often referred to additional and more invasive testing that ultimately produces low yields of obstructive CAD. Therefore, we welcome sex-specific tools like Corus CAD to help us more effectively identify the right patients who need further noninvasive and invasive cardiac workup."
Among the 141 women studied, 73 percent had low Corus CAD scores. PCPs referred 12 percent of patients with low scores and 48 percent with non-low scores to cardiology. Of the patients with low scores who underwent additional testing, none were found to have clinically significant obstructive CAD. The average follow-up duration was 163 days, and no patients experienced a major adverse event during this time.
About Obstructive Coronary Artery DiseaseCoronary artery disease is a very common heart condition in the United States. One in five deaths among Americans is caused by CAD.  CAD can cause a narrowing or blockage of the coronary arteries (vessels to the heart that supply the heart with blood, oxygen, and nutrients), reducing blood flow to the heart muscle. This narrowing or blockage in the coronary arteries is often referred to as obstructive CAD, characterized by the presence of atherosclerosis, or plaque. About Corus CADWith a simple blood draw, Corus CAD can safely, accurately and conveniently help primary care clinicians and cardiologists assess whether or not a stable non-diabetic patient's symptoms are due to obstructive coronary artery disease, enabling many patients to avoid unnecessary invasive procedures and exposure to imaging-related radiation risks or imaging agent intolerance. The test has been clinically validated in multiple independent patient cohorts, including two prospective, multicenter U.S. studies, PREDICT and COMPASS. Additionally, a retrospective, multicenter chart review study and the prospective IMPACT trial at Vanderbilt University demonstrated that Corus CAD use yields statistically significant and clinically relevant changes in patient management decisions in both primary care and cardiology settings. Corus CAD has been used commercially by clinicians in more than 35,000 patients and is a covered benefit for more than 40 million Medicare enrollees in the U.S. Corus CAD has also been recognized by The Wall Street Journal's Technology Innovation Awards, honored as a Gold Edison Award recipient, and named one of TIME's Top Ten Medical Breakthroughs. CardioDx was recently honored as one of FierceMedicalDevices' "Fierce 15" most promising privately held medical device and diagnostic companies. The Corus CAD test is intended for use in non-diabetic stable patients who present with typical or atypical symptoms suggestive of CAD, with no known history of CAD, no prior myocardial infarction (MI) or revascularization procedure, and who are not currently taking steroids, immunosuppressive agents or chemotherapeutic agents.