Risk of progression at two years based on the presence or absence of risk factors in patients with smoldering multiple myeloma. From Mateos MV et al. International myeloma working group risk stratification model for smoldering multiple myeloma (SMM). Blood Cancer J. 2020;10(10):102. (Attribution 4.0 International CC BY 4.0 [ http://creativecommons.org/licenses/by/4.0]).