Table 1.
Demographic and baseline variables and treatment characteristics of the study population.
| Variables | Entire dataset (N =267), (%) | p-value | |
|---|---|---|---|
| IFI | ENI | ||
| Total | 102 (100) | 165 (100) | |
| Age, y | .478 | ||
| Median, (range) | 61(46-74) | 62(44-75) | |
| Sex | .326 | ||
| Male | 86(84) | 146(88) | |
| Female | 16(16) | 19(12) | |
| ECOG PS | .499 | ||
| 0 | 82(80) | 138(84) | |
| 1 | 20(20) | 27(16) | |
| Smoking | .682 | ||
| Yes | 42(41) | 63(38) | |
| No | 60(59) | 102(62) | |
| Tumor location | .100 | ||
| Ut/Mt | 59(58) | 111(67) | |
| Lt | 43(42) | 54(33) | |
| Clinical T status† | .212 | ||
| T1+T2 | 12(12) | 12(7) | |
| T3+T4 | 90(88) | 153(93) | |
| Clinical N status† | .434 | ||
| N0+N1 | 50(49) | 89(54) | |
| N2+N3 | 52(51) | 76(46) | |
| Clinical Stage† | .758 | ||
| I+II | 22(22) | 33(20) | |
| III+IVA | 80(80) | 132(80) | |
| Tumor length, cm | .301 | ||
| Median, (range) | 4(2-8) | 4(2-11) | |
| Prescribed dose, Gy | .219 | ||
| Median, (range) | 41.4(40.0-41.4) | 41.4(39.6-41.4) | |
| No. of dissected lymph nodes | .964 | ||
| Median, (range) | 25(15-46) | 24(16-43) | |
| R0 resection | .441 | ||
| R0 | 97(95.1) | 153(92.7) | |
IFI, involved-field irradiation; ENI, elective-nodal irradiation; ECOG PS, Eastern Cooperative Oncology Group Performance Status; Ut, upper thoracic esophagus; Mt, middle thoracic esophagus; Lt, lower thoracic esophagus;
† American Joint Committee on Cancer staging manual, eighth edition.