Journal
BLOOD
Volume 106, Issue 7, Pages 2276-2279Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2005-05-1858
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Funding
- NCI NIH HHS [CA 107476, CA100707, CA 62242] Funding Source: Medline
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We detected circulating plasma cells (PCs) by flow cytometry in 302 patients with newly diagnosed multiple myeloma (MM) by gating on CD38(+)CD45(-) cells. The number of circulating PCs per 50 000 mononuclear cells was reported. In 80 (27%) patients, no circulating PC were seen; 106 (35%) patients had 1 to 10 and 115 (38%) patients had more than 10 circulating PCs. Median overall survival for the 302 patients was 47 months. Patients with 10 or fewer circulating PCs had a median survival of 58.7 months, whereas patients with more than 10 circulating PCs had a median survival of 37.3 months (P =.001). On Multivariate analysis, the prognostic value of circulating PCs was independent of beta(2)-microglobulin, albumin, and C-reactive protein. There was only a weak correlation between tumor mass and circulating PCs, suggesting that the appearance of circulating PCs may be a reflection of tumor biology. We conclude that the number of circulating PCs measured by flow cytometry in patients with newly diagnosed MM is an independent predictor of survival.
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