PCP Use of a Gene Expression Test (Corus CAD or ASGES) in Coronary Artery Disease Diagnosis

In symptomatic patients with or without prior cardiac testing, the PCP will initially decide
the subject's pretest probability for coronary artery disease (CAD) based on the subject's
risk factors and quality of chest pain (typical or atypical), or anginal equivalent (e.g.,
jaw, arm pain, or unexplained shortness of breath) and consider the results of prior testing,
if applicable. The initial questionnaire will capture the PCP's initial clinical impression
and decision ('preliminary decision') on how to further evaluate and manage the patient. A
Corus CAD (Age/Sex/Gene Expression score - ASGES) assay will be performed at the PCP's
office. After the PCP has received the Corus CAD (ASGES) result (approximately 2-3 days
later), the PCP will decide on the appropriate evaluation and management of the patient
('final decision') using the Corus CAD (ASGES) result in conjunction with his/her clinical
impression and/or other clinical data available. The primary aim of this study is to evaluate
whether the Corus CAD (ASGES) test results is associated with a change in the PCPs'
diagnostic evaluation and management of patients as compared to their initial testing and
treatment decisions.

Since it takes approximately two days for the physician to receive the result of the Corus
CAD (ASGES), symptomatic subjects with unstable angina, or suspicion for myocardial
infarction will be excluded from the study.

A follow-up phone call and a detailed questionnaire will be performed at 30 + 15 days, from
the time of blood draw, to assess the triage decision, such as referral to any subspecialists
(cardiologist, gastroenterologist, and pulmonologist), cardiac diagnostic tests performed,
cardiac procedures performed, and results of these cardiac tests and procedures.

Inclusion Criteria:

1. Stable chest pain, typical or atypical angina or anginal equivalent

2. The patient has signed the appropriate Institutional Review Board approved Informed
Consent Form.

Exclusion Criteria:

1. History of myocardial infarction

2. Current Myocardial infarction (MI) or acute coronary syndrome.

3. Current New York Heart Association (NYHA) class III or IV congestive heart failure
symptoms.

4. Any previous coronary revascularization.

5. Any individuals with :

- Diabetes

- Suspected unstable angina

- Systemic infections

- Systemic inflammatory conditions

6. Any individuals currently taking:

- Steroids

- Immunosuppressive agents

- Chemotherapeutic agents

7. Any Major Surgery within 2 months