No history of atrial fibrillation or myocardial infarction Patients with a history of the following within =< 12 months of study entry are not eligible:\r\n* Arterial thromboembolic events\r\n* Unstable angina\r\n* Myocardial Infarction No angina or myocardial infarction within 182 days of registration; in view of potential cardiac risk with lenalidomide, patients with stable angina will be excluded No clinically significant cardiac arrhythmias, stroke or myocardial infarction within 6 months prior to enrollment Myocardial infarction within the past 6 months Patients must not have a myocardial infarction within 6 months prior to registration History of myocardial infarction or unstable angina within 12 months prior to day 1 Patients with myocardial infarction or unstable angina < 6 months prior to starting study drug History of myocardial infarction within 6 months. Unstable angina or myocardial infarction. History of myocardial infarction, unstable angina, cardiac or other vascular stenting, angioplasty, or cardiac or vascular surgery within 6 months prior to day 1 of study treatment Severe arterial thromboembolic events (myocardial infarction, unstable angina pectoris, stroke) less than 6 months before inclusion Acute myocardial infarction 6 months prior to entry History of prior myocardial infarction or arrhythmia History or clinical signs of myocardial infarction within 1 year of study entry The patient has had a myocardial infarction in the previous 12 weeks. (Prior to study entry, electrocardiogram [ECG] abnormalities at screening must be documented by the investigator as not medically relevant.) Unstable angina, myocardial infarction, known or suspected transient ischemic events, or stroke within 24 weeks of start of Screening. History of thrombotic or hemorrhagic stroke or myocardial infarction within 6 months Acute myocardial infarction within 6 months before starting study drug. Myocardial infarction within the last 6 months Severe/unstable angina, coronary artery/peripheral bypass graft, or myocardial infarction. Myocardial infarction within the last 6 months