Bone marrow percentage of plasma cells in the staging of monoclonal gammopathies.

: In the present study, the relationships between percentage of bone marrow plasma cells (BMP%), tumor cell mass, stage, and survival are statistically analyzed in a large number (90) of monoclonal gammopathies (MG). Though BMP% has not been included among the criteria for the staging of multiple myeloma, our results indicate that the above mentioned parameters correlate at highly significant degrees. BMP% is therefore proposed as a new, useful parameter in the staging of MG.