A to Z-(TIMI 21) evaluated if early aggressive treatment with simvastatin compared to standard therapy reduces major cardiac events at 1 year in high-risk acute coronary syndrome patients. TIMI 21 also evaluated the safety and efficacy of enoxaparin compared to unfractionated heparin when given to patients with acute coronary syndromes also receiving the GP IIb/IIIa inhibitor tirofiban.