High-dose radiotherapy using helical tomotherapy for vertebral metastasis: early clinical outcomes and cord dose specification.

Abstract:

OBJECTIVE:For several decades, radiotherapy has been widely used to treat metastatic vertebral tumors. This study was designed to assess the feasibility and early clinical outcomes of high-dose radiotherapy to treat such tumors, using helical tomotherapy. METHODS:Between June 2009 and December 2011, 51 sites in 36 patients were treated with high-dose radiotherapy using helical tomotherapy for vertebral metastasis. Treatment outcomes and dosimetric analyses of spinal cord were retrospectively evaluated. RESULTS:Median follow-up was 11.5 months (range, 6-34.6) for surviving patients. The median total dose and the number of fractions in the primary helical tomotherapy arm were 2700 cGy and 3 fractions, respectively. Actuarial 6-month local control rates were 85.7%, and symptomatic vertebral compression fractures developed in five patients after a median of 4.2 (range, 2.9-5.7) months. Among 13 patients with 19 metastatic sites who showed pre-treatment impairment in neurologic function, five patients (with seven sites) in whom symptoms were mild showed improvement in neuronal function. The median pre-treatment pain visual analog scale score of 7 decreased to a median of 3 after helical tomotherapy (P < 0.001) at a median of 1 month (range, 0.5-3.2) of follow-up. No significant morbidity developed during follow-up except for one grade 3 esophagitis. CONCLUSIONS:The use of helical tomotherapy to treat metastatic vertebral tumors appears to be both safe and reliable in terms of local tumor control and early pain relief. Local progression and the risk of compression fracture in patients with pre-existing spinal instability remain the principal factors of limiting improved clinical and functional outcomes. Optimal dose-fractionation schemes and appropriate patient selection are required to achieve better outcomes with high-dose radiotherapy using helical tomotherapy.

journal_name

Jpn J Clin Oncol

authors

Lee DS,Kwak YK,Jeong SM,Song JH,Kang YN,Lee SN,Jang HS,Kim YS,Yoon SC,Choi BO

doi

10.1093/jjco/hyt050

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

646-53

issue

6

eissn

0368-2811

issn

1465-3621

pii

hyt050

journal_volume

43

pub_type

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