Table I.
Characteristics of the patients (n=24) and tumors (n=39).
| Characteristics | n (%) | Median (range) |
|---|---|---|
| Gender | ||
| Male | 14 (58.3) | – |
| Female | 10 (41.7) | – |
| Age, years | – | 64 (43–84) |
| Performance status | ||
| 0 | 14 (58.3) | – |
| 1 | 10 (41.7) | – |
| Primary tumor location | ||
| Right-sided colon | 4 (16.7) | – |
| Left-sided colon | 14 (58.3) | – |
| Rectum | 6 (25.0) | – |
| Interval between the initial treatment and radiotherapy, months | – | 34 (5–145) |
| Number of liver metastasis at the initial radiotherapy | ||
| 1 | 18 (75.0) | – |
| 2 | 4 (16.7) | – |
| 3 | 2 (8.3) | – |
| Usage of chemotherapy after initial surgery to radiotherapy | ||
| Yes | 21 (87.5) | – |
| No | 3 (12.5) | – |
| Presence of metastasis at the initial diagnosis | ||
| Yes | 8 (33.3) | – |
| No | 16 (66.7) | – |
| History of local therapya for metastasis | ||
| Yes | 16 (66.7) | – |
| No | 8 (33.3) | – |
| History of chemotherapy | ||
| Yes | 21 (87.5) | – |
| No | 3 (12.5) | – |
| History of radiotherapy | ||
| Yes | 4 (16.7) | – |
| No | 20 (83.3) | – |
| Presence of extra diseases outside the field of radiotherapy | ||
| Yes | 5 (20.8) | – |
| No | 19 (79.2) | – |
| Primary tumor location | ||
| Right-sided colon | 7 (17.9) | – |
| Left-sided colon | 22 (56.4) | – |
| Rectum | 10 (25.6) | – |
| GTV, cc | – | 8.7 (0.4–134.7) |
| Size of maximum diameter, mm | 35.6 (7.0–116.9) | |
| ≤30 | 18 (46.2) | – |
| 30–50 | 13 (33.3) | – |
| >50 | 8 (20.5) | – |
| PTV, cc | – | 52.8 (12.3–243.0) |
| Total dose, Gy | – | 56.0 (45.0–72.0) |
| Number of fractions | – | 8 (4–33) |
| Fraction size, Gy | – | 7.0 (2.0–12.0) |
| Total prescription BED10, Gy | – | 97.5 (71.7–115.5) |
a
Local therapy included surgery, radiofrequency ablation, and radiotherapy. GTV, gross tumor volume; PTV, planning target volume; BED, biologically effective dose.