alexa Solitary plasmacytoma of bone and soft tissue.
Clinical Research

Clinical Research

Journal of Clinical Case Reports

Author(s): Bolek TW, Marcus RB Jr, Mendenhall NP

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Abstract PURPOSE: This retrospective review evaluates the results of radiotherapy used for curative intent in the management of solitary plasmacytoma. METHODS AND MATERIALS: Between August 1963 and January 1993, 37 patients with a solitary plasmacytoma were treated with curative intent at the University of Florida. Criteria for inclusion in the study were (a) a biopsy-proven plasmacytoma, (b) no tumor in the bone marrow on biopsy, and (c) no evidence of disseminated disease on skeletal survey. The primary site was osseous in 27 patients and extramedullary in 10 patients; 9 of the 10 extramedullary lesions were located in the upper respiratory passages. Treatment consisted of primary radiotherapy in all but one patient, who received surgical resection alone. Two patients also received adjuvant chemotherapy. The median radiation dose was 43.2 Gy in 1.8-Gy fractions. Absolute survival, progression to myeloma, and local control rates were calculated using the Kaplan-Meier method. A multivariate analysis was performed for prognostic factors predictive of absolute survival. RESULTS: Multivariate analysis revealed tumor type (osseous vs. extramedullary) to be predictive of absolute survival (p = 0.12). Factors not predictive of survival were age, sex, use of chemotherapy, immunoglobulin level, and type of immunoglobulin elevated. Patients with osseous tumors had a lower survival rate than those with extramedullary tumors (55\% vs. 80\% at 10 years, p = 0.06). Multiple myeloma was more likely to develop in patients with osseous tumors (54\% vs. 11\% at 10 years, 100\% vs. 33\% at 15 years, p = 0.03). Of patients in whom multiple myeloma developed, those with osseous tumors had a poorer survival rate after development of myeloma (32\% vs. 100\% at 5 years, p = 0.11). Local relapse developed in 1 patient with an osseous tumor 10 months after treatment with 28.3 Gy in 14 fractions; this was controlled with an additional 28.3 Gy in 10 fractions. Local failure did not develop in any patient with an extramedullary tumor. CONCLUSIONS: Radiotherapy is an effective local treatment for solitary plasmacytoma. Osseous tumors were found to have a poor prognosis compared with extramedullary tumors.
This article was published in Int J Radiat Oncol Biol Phys and referenced in Journal of Clinical Case Reports

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