Solitary plasmacytoma of bone: treatment, progression, and survival.

Twenty patients with solitary plasmacytoma of bone were treated by radiation therapy. Local control was achieved in 19 and most patients developed systemic myeloma. To evaluate disease progression, 65 patients, including 45 from published series, were analyzed. Younger patients seemed less likely to progress (P = .06), but other clinical characteristics including site of involvement and paraprotein status did not influence progression. After dissemination, patients had a clinical course similar to patients with stage I myeloma, with a median survival of 47 months. Overall, patients with solitary plasmacytoma of bone had an indolent course of disease, with a median survival of 10.7 years and a 5-, 10-, and 20-year survival of 75%, 52%, and 37%, respectively.