OS by stage migration at 3 months. OS (in years) from 3 months of starting first-line treatment in AL amyloidosis patients who had improved stage (red curve), same stage (green curve), or worse stage (blue curve) at 3 months of starting first-line treatment based on modified Mayo 2004 (A) and Mayo 2012 (B) staging systems. The P values represent the association between the groups of patients with improved stage compared with patients with the same stage as diagnosis, and patients with worse stage compared with patients with the same stage as diagnosis.