Morehouse School of Medicine, Atlanta, GA
Hari Prasad Ravipati , Amelia A. Langston , Lawrence Boise , Christopher Flowers , Sagar Lonial , Ajay K. Nooka , Jonathan L. Kaufman
Background: Plasma cell leukemia (PCL) is an aggressive plasma cell disorder that is associated with poor outcomes. Previous studies have shown improved survival with bortezomib-based regimens in this subset of patients undergoing stem cell transplant (SCT), but this may reflect referral bias. Current knowledge evaluating outcomes of PCL is limited in the era of novel agents. Methods: We analyzed the Surveillance, Epidemiology, and End Results (SEER) database from 18 registries for survival characteristics in PCL stratified by age, sex, race and the era of diagnosis. International Classification of Diseases for Oncology 3rd edition histology code 9733 was used to identify cases. Results: From 1973 to 2009, 74826 cases of myeloma and 479 cases of PCL were recorded. Survival data was available for 397 PCL patients. The median overall survival (OS) was 6 months (95% Confidence Interval (CI): 4.8 months – 7.2 months); and 1-year, 2-year, and 4-year OS rates were 34%, 20%, and 9% compared to corresponding myeloma survival rates of 66%, 52%, and 32%, respectively. Median overall survival differences were observed for women vs. men (7 months vs. 5 months, p=0.026); black vs. white patients (7 months vs. 5 months, p=0.01); and patients aged <60 years vs. ≥ 60 years (9 months vs. 4 months; P=0.01), respectively. In addition, patients diagnosed after 2005 had superior median OS compared with patients diagnosed prior to 2005 (7 months vs. 3 months; P=0.005). Conclusions: Black patients, women and patients aged <60 years have improved OS compared to white patients, males and patients aged ≥ 60 years. The survival benefit seen in patients diagnosed after 2005 may be attributed to the benefit conferred by access to new agents, but OS remains poor. Newer treatment approaches for managing PCL are clearly needed.
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