Risk of progression of MGUS to myeloma or related disorders. (A) The overall cumulative probability of the progression was 6.9% (95% CI, 4.9-9.6) at 10 years and 8.0% (95% CI, 5.4-11.9) at the latest follow-up. (B) By exposure distance. (C) By exposure age. (D) By exposure distance and exposure age. (E) By exposure age and age at diagnosis. (F) By the dichotomized serum M-protein level. (G) By exposure age and the serum M-protein level. (H) By exposure distance and serum M-protein level. The P values were calculated using the log-rank test. MP indicates M-protein. ATB indicates age at the time of bombing.