International Myeloma Working Group consensus criteria for response and minimal residual disease assessment in multiple myeloma

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Treatment of multiple myeloma has substantially changed over the past decade with the introduction of several classes of new effective drugs that have greatly improved the rates and depth of response. Response criteria in multiple myeloma were developed to use serum and urine assessment of monoclonal proteins and bone marrow assessment (which is relatively insensitive). Given the high rates of complete response seen in patients with multiple myeloma with new treatment approaches, new response categories need to be defined that can identify responses that are deeper than those conventionally defined as complete response. Recent attempts have focused on the identification of residual tumour cells in the bone marrow using flow […]

International Myeloma Working Group (IMWG) Uniform Response Criteria for Multiple Myeloma

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The International Myeloma Working Group established the below criteria in order to: facilitate precise comparisons of efficacy between new treatment strategies in trials incorporate the serum free light chain (FLC) assay to include assessment of patients with oligo-secretory and non-secretory disease provide stricter definitions for CR (complete response) provide classifications that would improve detail and correct inconsistencies in prior response criteria. The following criteria reconcile various previously used systems for assessing response and have been universally adopted. Response IMWG criteria sCR CR as defined below plus normal FLC ratio and absence of clonal cells in bone marrow3 by immunohistochemistry or immunofluorescence4 CR Negative immunofixation on the serum and urine and […]

International uniform response criteria for multiple myeloma

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New uniform response  criteria are required to adequately assess clinical outcomes in myeloma. The European Group for Blood and Bone Marrow Transplant/International Bone Marrow Transplant Registry criteria have been expanded, clari?ed and updated to provide a new comprehensive evalua- tion system. Categories for stringent complete response and very good partial response are added. The serum free light- chain assay is included to allow evaluation of patients with oligo-secretory disease. Inconsistencies in prior criteria are clari?ed making con?rmation of response and disease progres- sion easier to perform. Emphasis is placed upon time to event and duration of response as critical end points. The require- ments necessary to use overall survival duration […]