Background: SBP of spine is a primary spinal malignant tumor. Risk factors for progression of solitary plasmacytoma of bone (SBP) to multiple myeloma in spine remains controversial. We aimed to analysis the risk factors for progression of solitary plasmacytoma of bone (SBP) to multiple myeloma in spine.
Methods: A total of 1543 patients diagnosed with SBP of spine in the Surveillance, Epidemiology, and End Results (SEER) database from 1992 to 2013 were included in the study. Factors associated of progression to multiple myeloma (MM) were assessed with univariate and multivariate methods.
Results: 1543 patients with SBP of spine were collected and 659 patients progressed to MM. The overall rate of progression to MM was 42.51%, Age, race, gender, and chemotherapy were found to be associated with disease progression to MM in the univariate analysis, greater age (45-59: OR=2.017, 95%CI, 1.287 to 3.159; 60-74: OR=2.940, 95%CI, 1.891 to 4.570; 75-89: OR=3.180, 95%CI, 1.976 to 5.118; >89: OR=5.524, 95%CI, 1.965 to 15.526), patients of white race (OR = 2.032, 95% CI, 1.079 to 3.826), female patients (OR = 1.272, 95% CI, 1.027 to 1.576), and patients received chemotherapy (OR = 1.593, 95%CI, 1.243 to 2.042) was identified as independent risk factors for SBP of spine progression to MM in the multivariate analysis.
Conclusions: Greater age, white race, female and chemotherapy was identified as independent risk factors for SBP of spine progression to MM.