{Reference Type}: Journal Article {Title}: Smoldering Multiple Myeloma: Observation Versus Control Versus Cure. {Author}: Rajkumar SV;Bergsagel PL;Kumar S; {Journal}: Hematol Oncol Clin North Am {Volume}: 38 {Issue}: 2 {Year}: 2024 Apr 28 {Factor}: 2.861 {DOI}: 10.1016/j.hoc.2023.12.001 {Abstract}: Smoldering multiple myeloma (SMM) is an intermediate clinical stage in the spectrum of monoclonal plasma cell disorders. It represents a heterogeneous clinically defined condition in which some patients (approximately 50%) have monoclonal gammopathy of undetermined significance (premalignancy), and some (approximately 50%) have multiple myeloma (biologic malignancy). Using specific prognostic factors, patients with SMM, in whom malignant transformation has already likely occurred, can be identified. These patients are considered to have high-risk SMM. Patients with newly diagnosed high-risk SMM are candidates for early intervention with lenalidomide or lenalidomide plus dexamethasone for 2 years, or enrollment in clinical trials.