• Tingyi Xia, Hongqi Li, Qingxuan Sun, Yingjie Wang, Naibin Fan, Yong Yu, Ping Li, and Joe Y Chang.
• Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China. xiatingyi1959@21cn.com
• Int. J. Radiat. Oncol. Biol. Phys. 2006 Sep 1; 66 (1): 117-25.

PurposeTo evaluate the efficacy and toxicity of hypofractionated stereotactic body radiotherapy in patients with Stage I/II non-small-cell lung cancer.Methods And MaterialsForty-three patients with inoperable Stage I/II non-small-cell lung cancer underwent treatment prospectively using the stereotactic gamma-ray whole-body therapeutic system (body gamma-knife radiosurgery) with 30 rotary conical-surface Co(60) sources focused on the target volume. Low-speed computed tomography simulation was conducted, which was followed by three-dimensional conformal radiotherapy planning. A total dose of 50 Gy was delivered at 5 Gy/fraction to the 50% isodose line covering the planning target volume, whereas a total dose of 70 Gy was delivered at 7 Gy/fraction to the gross target volume. The median follow-up duration was 27 months.ResultsThree to 6 months after treatment, the complete response rate for body-gamma knife radiosurgery was 63%, and the overall response rate was 95%. The 1-year, 2-year, and 3-year local control rates were all 95% in all patients. The 1-year, 2-year, and 3-year overall survival rates were 100%, 91%, and 91%, respectively, in patients with Stage I disease and 73%, 64%, and 64%, respectively, in those with Stage II disease. Only 2.3% (1/43) of the patients had Grade 3 pneumonitis.ConclusionOur highly focused stereotactic body radiotherapy method resulted in promising local control and survival with minimal toxicity.

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