The first Revlimid® study reported by List et al included all transfusion dependent MDS patients, but given the early experience which showed a better response in del(5q) patients and those with lower risk disease, more patients belonging to this category were entered on the trial. The subsequent multi-center studies were focused entirely on the low/Int-1 patients who were transfusion dependent. In the present study, we would like to recapitulate the initial study by only treating the transfusion dependent, low and intermediate-1 risk MDS patients without deletion (5q). Since the predictive assay is most applicable for the non-del(5q) patients, and to avoid confusion resulting from an admixture of patients with del(5q) for whom the drug is already FDA approved, we have elected to restrict this clinical trial to only the non-del(5q) patients.