Table 1.
Patients and tumor characteristics
| Characteristic | No. (%) |
|---|---|
| Age, median, years | 78 (range: 48-92) |
| Gender | |
| Female | 19 (21) |
| Male | 68 (78) |
| ECOG performance status | |
| 0-1 | 71 (81) |
| 2 | 12 (13) |
| 3 | 4 (4) |
| Tumor diameter, median, cm | 2.2 (range: 0.9-4.2) |
| ≤ 2.0 | 38 (42) |
| 2.1-3.0 | 40 (44) |
| 3.1-5.0 | 12 (13) |
| Pathology | |
| Adenocarcinoma | 32 (35) |
| Squamous cell carcinoma | 20 (22) |
| Others | 8 (8) |
| Clinically diagnosed | 30 (33) |
| SBRT dose, BED10 | |
| ≤ 102 Gy10 | 44 (48) |
| > 102 Gy10 | 46 (51) |
| Prescription | |
| Isocenter | 59 (65) |
| D95 | 31 (34) |
Data are shown as number (percentage) of patients for parameters from age to performance status and as number (percentage) of tumors for other parameters.
Abbreviations: ECOG, Eastern cooperative oncology group; BED10, biological effective dose, calculated by the formula BED = nd [1 + d/(α/β)], where n is the number of fractions, d is the dose/fraction, and α/β ratio is 10 Gy for tumors; D95, doses covering 95% of the planning target volume.