Clinical Relapse of Multiple Myeloma or Plasma Cell Leukemia by IMWG

**Semantic type:** Finding

**Definition:** Relapse of multiple myeloma or plasma cell leukemia is defined as follows: Development of new soft tissue plasmacytomas or bone lesions; Definite increase in the size of existing plasmacytomas or bone lesions. A definite increase is defined as a 50% (and at least 1 cm) increase as measured serially by the sum of the products of the cross-diameters of the measurable lesion; Hypercalcemia (> 11.5 mg/dL) [2.65 mmol/L]; Decrease in hemoglobin of > 2 g/dL [1.25 mmol/L]; and rise in serum creatinine by 2 mg/dL or more [177 mmol/L or more]. (International Myeloma Working Group (IMWG) Uniform Response Criteria for Multiple Myeloma. <http://myeloma.org/ArticlePage.action?articleId=2994>)

**Synonyms:** - Clinical Relapse of Multiple Myeloma or Plasma Cell Leukemia (IMWG) - Relapse of Multiple Myeloma or Plasma Cell Leukemia - Relapse of Multiple Myeloma or Plasma Cell Leukemia (IMWG) - Relapse of Multiple Myeloma or Plasma Cell Leukemia by IMWG