Table 1.
Patient characteristics
| Median age (range) | 79 (60–86) |
| Sex: male/female | 17/8 |
| Median follow up duration (month)(range) | 25 (5–100) |
| Clinical T stage | |
| T3: | |
| <2 cm carina | 2 |
| chest wall | 10 |
| mediastinal pleura | 2 |
| pericardium | 1 |
| T4: | |
| mediastinum | 3 |
| major blood vessel | 7 |
| Location: central/peripheral | 19/6 |
| Histology | |
| Squamous cell carcinoma | 12 |
| Adenocarcinoma | 7 |
| Non–small cell carcinoma | 4 |
| Pathologically unproven | 2 |
| Reasons for not fit for surgerya | |
| Old age | 10 |
| COPD | 8 |
| Cardiovascular disease | 3 |
| Postoperative impaired pulmonary function | 3 |
| Technically unresectable | 2 |
| Dementia | 1 |
| Cerebral infarction | 1 |
| Idiopathic pulmonary fibrosis | 1 |
| Median tumor diameter (cm) (range) | 4.0 (2.3–8.5) |
| Median ITV (cm3) (range) | 29 (0.9–314) |
| Median PTV (cm3) (range) | 85 (9.6–363) |
| Dose fractionation: | |
| SBRT | |
| 40 Gy/5 fr | 9 |
| 50 Gy/5 fr | 10 |
| SBRT after 3D-CRT (30 Gy/15 fr∼50 Gy/25 fr) | |
| 25 Gy/5 fr | 4 |
| 30 Gy/5 fr | 1 |
| 40 Gy/10 fr | 1 |
SBRT = stereotactic body radiotherapy, COPD = chronic obstructive pulmonary disease, ITV = internal target volume, PTV = planning target volume, 3D-CRT = three-dimensional conformal radiotherapy. aThe numbers in these items overlap.