Table 1.
Patient characteristics (n = 28).
| Characteristics | |
|---|---|
| Age, years, median (range) | 63 (40–76) |
| PS, number | |
| 0 | 12 (42.9%) |
| 1 | 16 (57.1%) |
| Sex, number | |
| Male | 16 (57.1%) |
| Female | 12 (42.9%) |
| Primary tumor surgery, number | |
| Abdominoperineal excision | 16 (57.1%) |
| Low anterior resection | 9 (32.1%) |
| Hartmann's resection | 1 (3.6%) |
| Intersphincteric resection | 2 (7.2%) |
| Histology, number | |
| Well-differentiated adenocarcinoma | 10 (35.7%) |
| Moderately differentiated adenocarcinoma | 15 (53.6%) |
| Mucinous adenocarcinoma | 3 (10.7%) |
| Duration of surgery to C-ion RT, months, median (range) | 25.6 (2.6–117.6) |
| Tumor site, number | |
| Presacral | 7 (25.0%) |
| Side wall | 17 (60.7%) |
| Perineal | 4 (14.3%) |
| Tumor size, mm, median (range) | 44 (16–84) |
| Serum CEA level before C-ion RT, ng/mL, median (range) | 10.7 (0.3–617.3) |
CEA, carcinoembryonic antigen; C-ion RT, carbon ion radiotherapy; PS, performance status.