{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T05:04:35Z","timestamp":1789016675661,"version":"build-2803163510"},"reference-count":14,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2021,6,14]],"date-time":"2021-06-14T00:00:00Z","timestamp":1623628800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["European J of Haematology"],"published-print":{"date-parts":[[2021,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Multiple myeloma (MM) patients with smoldering (S) disease are defined by a lack of CRAB\/SLiM criteria but may transform into disease requiring treatment. The International Myeloma Working Group risk stratification model for SMM uses serum M\u2010protein, serum\u2010free light chain ratio, and bone marrow plasma cell percentage. We investigated whether baseline serum B\u2010cell maturation antigen (sBCMA) levels are predictive of disease progression among 65 patients with SMM.<\/jats:p><jats:p>A receiver operating characteristic curve was used to establish a definition for high\u2010risk baseline sBCMA. Mantel Byar analysis was used to examine whether high\u2010risk sBCMA was correlated with shorter time to transformation, and a time\u2010dependent cox proportional hazard was used to determine whether it is independent of other risk factors. A z test for proportions was used to compare the percentage of patients that progressed among high\u2010risk versus low\u2010risk sBCMA patients.<\/jats:p><jats:p>A baseline sBCMA level \u2265137.5\u00a0mg\/ml was found to be the optimal cutoff between high\u2010 and low\u2010risk SMM patients. Patients with high\u2010risk sBCMA levels had a shorter time to transformation (<jats:italic>P\u00a0<\/jats:italic>=\u00a0.000332). sBCMA was also higher at the time of transformation than baseline levels (<jats:italic>P<\/jats:italic>\u00a0=\u00a0.0116). sBCMA was the only variable found to be significantly predictive of time to transformation and additionally was found to be independent of other risk factors.<\/jats:p><jats:p>In this study, we have shown for the first time that sBCMA levels predict transformation of SMM to active disease and that these levels increase at the time of transformation. These results are consistent with other studies showing that active MM patients undergoing therapy with higher baseline sBCMA levels are more likely to progress early and its levels increase at the time of disease progression.<\/jats:p>","DOI":"10.1111\/ejh.13666","type":"journal-article","created":{"date-parts":[[2021,5,16]],"date-time":"2021-05-16T14:19:35Z","timestamp":1621174775000},"page":"318-323","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Baseline serum B\u2010cell maturation antigen levels predict time to disease progression for patients with smoldering multiple myeloma"],"prefix":"10.1111","volume":"107","author":[{"given":"Sean","family":"Bujarski","sequence":"first","affiliation":[{"name":"Institute for Myeloma and Bone Cancer Research  West Hollywood CA USA"},{"name":"Berenson Cancer Center  West Hollywood CA 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