The Study to Compare Cypher Versus Cypher Select in Treating Cornary Artery Lesions.

Inclusion Criteria: 1. Diagnosis of angina pectoris as defined by Canadian Cardiovascular Society Classification (CCS I, II, III, IV) OR unstable angina pectoris (Braunwald Classification B\&C, I-II-III) OR patients with documented silent ischemia; 2. Single treatment of de novo lesion in a coronary artery which can be appropriately covered by a study stent up to 23mm in length in patients with single or multivessel disease; patients with multiple lesions can be included only if the other lesions are successfully treated before the target lesion; 3. Target lesion is more than 2.5 and less than 3.5mm in diameter (visual estimate); 4. Target lesion is located in a native coronary artery with a maximum lesion length that can be adequately covered by a single 23 mm stent; 5. Target lesion stenosis is \> 50% and \< 100% (visual estimate). Exclusion Criteria: 1. A Q-wave or non-Q-wave myocardial infarction within the preceding 72 hours unless the CK and CK-MB enzymes are back to normal; 2. Unprotected left main coronary disease with more than 50% stenosis; 3. Significant (\>50%) stenoses proximal or distal to the target lesion that might require revascularization or impede runoff; 4. Have an ostial target lesion; 5. Angiographic evidence of thrombus within target lesion; 6. Calcified lesions which cannot be successfully predilated; 7. Ejection fraction less than 30%; 8. Totally occluded vessel (TIMI 0 level); 9. Direct Stenting;