Table 2.
Tumor and treatment characteristics
| Characteristic | No. (%) |
|---|---|
| Tumor size (maximum diameter on CT) | |
| Median | 3.8 cm |
| Range | 1.3–8.0 cm |
| Tumor location | |
| Head | 63 (58) |
| Other (body/tail) | 46 (42) |
| Grade | |
| Poorly differentiated | 23 (21) |
| Moderately differentiated | 12 (11) |
| Well differentiated | 5 (5) |
| Missing | 69 (63) |
| Radiation dose | |
| ≤5040 cGy | 29 (27) |
| >5040 cGy | 78 (72) |
| Missing | 2 (2) |
| Beam arrangement | |
| 3-field | 18 (17) |
| 4-field | 43 (39) |
| 5-field | 3 (3) |
| IMRT | 28 (26) |
| Missing | 17 (16) |
| Induction chemotherapy | |
| Yes | 5 (5) |
| Gemcitabine | 4 (4) |
| 5-FU | 1 (1) |
| No | 104 (95) |
| Concurrent chemotherapy | |
| 5-FU based | 73 (67) |
| Gemcitabine based | 20 (18) |
| Paclitaxel | 7 (7) |
| No chemo | 7 (7) |
| Missing | 2 (2) |
| Treatment break | |
| No break | 65 (60) |
| Break | 44 (40) |
| Toxicity break | 39 (36) |
| Planned break | 5 (4) |
| Palliative procedure | |
| Bypass | 28 (26) |
| Stent | 46 (42) |
| None | 35 (32) |
IMRT, intensity modulated radiation therapy.