[Guidelines for the diagnosis and management of multiple myeloma in China (2024 revision)].

Multiple myeloma (MM), an incurable clonal plasma cell dysplasia, is the second most common hematological malignancy in many countries, mainly developing in the elderly population. With the emergence of novel agents and laboratory methods, the diagnosis and treatment of MM have been significantly improved. In this version of the "Guidelines for the diagnosis and management of multiple myeloma in China (2024 revision)", several examination items have been updated in the diagnostic section; the definition of ultra high-risk MM has been proposed in the risk stratification section; for patients with equal or more than second-line relapse, chimeric antigen receptor T cell therapy and a bispecific T-cell engager have been added; and the treatment recommendations have been listed at different levels based on the best available evidence.