 As regulated by data protection and privacy laws and in accordance with local ethics committee requirements, subjects will be informed and requested to grant their approval after the index procedure cardiac catheterization for suspected acute coronary syndrome to review their medical records and collect and analyze personal medical information. The confidentiality of the records will be maintained at all times. Subjects will be asked to agree to perform a cancer screening during index hospitalization and will also be asked to agree to be contacted during the 5-year follow-up period. 