Linear accelerator-based stereotactic body radiation therapy in the treatment of oligometastatic disease.

The following inclusion criteria were set for the study: i) The maximum diameter of the OM was not more than 5 cm; ii) up to three lesions per patient were present; iii) an increasing trend for computed tomography (CT) scanning was noted; iv) by positron emission tomography (PET) scanning, an accumulation of 2-(18F)fluoro-2-deoxy-D-glucose (FDG) with a maximum standardized uptake value (SUV-max) ≥2.0 was present ( 15 ); v) the OM lesion was judged as inoperable by the respiratory cancer board; vi) there was no history of radiation therapy for the target lesion; vii) the Karnofsky performance status (KPS) ( 17 ) was ≥60%; viii) the primary tumor was confirmed via pathology; and ix) the prognosis was expected to be >3 months.

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