Prognosis Value of the Monoclonal Blood Plasma Cells in Multiple Myeloma

To the Editor: We have read with interest the paper of Witzyg et al[1][1] about the prognostic value of peripheral blood clonal plasma cells (PBPC) in patients with multiple myeloma (MM). We have recently evaluated the presence of PBPC at diagnosis in 49 MM patients. Plasma cell leukemia cases were