Time to progression (TTP) to MM. (A) Kaplan-Meier curves comparing the TTP to MM for patients with SBP based on the presence of a normal or abnormal sFLC ratio. (B) Kaplan-Meier curves comparing the TTP to MM for patients with SBP based on the presence or absence of minimal marrow involvement. (C) Kaplan-Meier curves comparing the TTP to MM for patients with SBP based on the presence or absence of HR FISH abnormalities. (D) Kaplan-Meier curves comparing the TTP to MM for patients with SBP based on the presence or absence of gain 1q and del 17p cytogenetic abnormalities.