Abstract:
BACKGROUND:Stereotactic radiation therapy is highly effective in the treatment of small brain metastases, regardless of the histology. This suggests that small extracranial malignancies may be curable with similar radiation therapy. The authors developed a novel treatment unit for administering such therapy. METHODS:The unit consisted of a linear accelerator (linac), an X-ray simulator (X-S), computed tomography (CT), and a table. The gantry axes of the three machines were coaxial and could be matched by rotating the table. Patients were instructed to perform shallow respiration with oxygen. The motion of the tumor was monitored with the X-S. When the motion was slight enough, the table was rotated to the CT. To include all geometric movement on the CT images, each scan was made while the patient was performing shallow respiration. After the CT positioning, the table was rotated to the linac, and non-coplanar treatment was given. Beginning in October 1994, 45 patients with 23 primary or 43 metastatic lung carcinomas were treated. Radiation doses at the 80% isodose line were 30-75 gray in 5-15 fractions over 1-3 weeks with or without conventional radiation therapy. RESULTS:The treatment was performed with no or minimal adverse acute symptoms. The daily treatment time was short. During a median follow-up of 11 months, local progression occurred in 2 of 66 lesions. Interstitial changes in the lung were limited. CONCLUSIONS:With this unit and procedure, focal radiation therapy similar to stereotactic radiation therapy is possible for extracranial sites. The preliminary experience appeared safe and promising, and further exploration of this approach is warranted.
journal_name
Cancerjournal_title
Cancerauthors
Uematsu M,Shioda A,Tahara K,Fukui T,Yamamoto F,Tsumatori G,Ozeki Y,Aoki T,Watanabe M,Kusano Sdoi
10.1002/(sici)1097-0142(19980315)82:6<1062::aid-cnsubject
Has Abstractpub_date
1998-03-15 00:00:00pages
1062-70issue
6eissn
0008-543Xissn
1097-0142pii
10.1002/(SICI)1097-0142(19980315)82:6<1062::AID-CNjournal_volume
82pub_type
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