The purpose of this study is to see if a new drug called CC-220 can be safe and effective to treat patients with Systemic Lupus Erythematosus. CC-220 is an oral medication. The study will last for about one year and will involve 16 study visits. There are two parts to the trial: In the first, patients will be assigned to get either CC-220 at 0.45mg, 0.3mg, 0.15 mg, or placebo (no active study drug). In the second part, all patients who got placebo during the first part will be re-assigned to get CC-220 at either 0.45mg or 0.3mg. The study will be blinded, which means you will not know which medication you are getting during either of the two parts. You will see a Rheumatologist, and give a blood and urine sample at each visit. The data obtained from this study will provide additional information to further assess the benefit and risk profile of CC-220 for the treatment of lupus.