Toho M, Ikeda D, Aikawa S, Misono C, Oura M, Fujii F, Sakuma H, Uehara A, Tabata R ikako, Narita K, Takeuchi M, Watari T, Otsuka Y, Matsue K. Serum B-cell maturation antigen could be a simple and accurate biomarker to identify and prognosticate monoclonal gammopathy of undetermined significance and smoldering multiple myeloma. Haematologica; https://doi.org/10.3324/haematol.2024.286842 [Early view].