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Criteria for non‐secretory multiple myeloma. 5
| Clonal plasma cells(biopsy‐proven) |
| <0.5 mg/dl serum protein by serum protein electrophoresis |
| <200 mg/24 h of light chain proteinuria by urine protein electrophoresis |
| Free light chain measurement unquantifiable |
| Positive “CRAB” criteria for symptomatic myeloma |
