Table 2.
Patient and tumor characteristics
| Median age | 77 (57–88) |
| Sex: male/female | 10/5 |
| Median follow up duration | 22.0 (12.0–27.0) |
| Operability: Yes/No | 1/14 |
| GOLD: normal/I/II | 10/1/4 |
| Smoking history: Yes/No | 12/3 |
| Pack-years | 24.0 (0–135) |
| Median maximum diameter of tumor (cm) | 2.1 (0.9–2.9) |
| ITV (ml) | 5.8 (1.0–12.4) |
| PTV (ml) | 28.9 (10.1–45.2) |
| SUVmax | 2.7 (0.8–7.1) |
| Disease | |
| Non-small-cell lung cancer | 7 |
| Clinically diagnosed lung cancer | 4 |
| Lung metastasis | |
| Solitary | 3 |
| Two | 1 |
GOLD = the Global Initiative for Chronic Obstructive Lung Disease, ITV = internal target volume, PTV = planning target volume, SUVmax = the maximum standard uptake value in 18F- fluorodeoxyglucose positron emission tomography.