Long‐term outcome of patients with solitary plasmacytoma treated with radiotherapy: A population‐based, single‐center study with median follow‐up of 13.7 years

医学 单中心 期限(时间) 结果(博弈论) 中心(范畴论) 放射治疗 浆细胞瘤 外科 内科学 多发性骨髓瘤 数学 物理 结晶学 量子力学 数理经济学 化学
作者
Dlawer Abdulla Barzenje,Arne Kolstad,Waleed Ghanima,Harald Holte
出处
期刊:Hematological Oncology [Wiley]
卷期号:36 (1): 217-223 被引量:14
标识
DOI:10.1002/hon.2415
摘要

Abstract In this single‐center, population‐based, and retrospective study, we analyzed the outcome of 49 patients with solitary bone plasmacytoma (SBP) and 28 patients with solitary extramedullary plasmacytoma (SEP), all treated with radiotherapy. Laminectomy was performed in 18/30 SBP patients with vertebral involvement and tumour resection in 10 SEP patients. Overall survival and cause of death for each patient were compared to 5 sex‐, age‐, and residency‐matched individuals from the normal population. Response (complete and partial) was achieved in 94% of SBP and 96% of SEP patients. Relapse rates were higher in SBP (65%) compared to patients with SEP (18%) ( P < .01). Only one in‐field relapse was identified for the whole series. Ten‐ and 15‐year overall survival, progression free survival (PFS) and multiple myeloma free survival (MMFS) for patients with SBP were 60%/41%, 25%/17%, and 33%/33%. Corresponding values for patients with SEP were 67%/54%, 57%/44%, and 91%/91%. SBP patients had significantly shorter PFS and MMFS compared to SEP patients ( P < .01 for both). Only two of the SEP patients developed multiple myeloma and no patient in the whole series progressed to multiple myeloma later than 10 years after diagnosis. Unlike for SEP, the major cause of death among SBP patients was multiple myeloma (49%). Compared to matched normal population, no increased risk of death from secondary malignancies or cardiovascular disease was observed. Positive predictors in SBP patients were for overall survival age <60 years, combined laminectomy and radiotherapy and radiotherapy dose >40 gray, for PFS tumour size <6 cm and combined laminectomy and radiotherapy and for MMFS tumour size <6 cm. Radiotherapy confers excellent local control in both SEP and SBP patients; however, the challenge is to prevent development of multiple myeloma in patients with SBP.
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