1.
Characteristics of the eligible patients
| Characteristics | n (%) | P | |
| Surgery + chemotherapy (N=40) | Surgery alone (N=80) | ||
| ECOG, Eastern Cooperative Oncology Group; LVI, lymphvascular invasion. | |||
| Age (year) | 0.698 | ||
| <55 | 20 (50.0) | 37 (46.3) | |
| ≥55 | 20 (50.0) | 43 (53.8) | |
| Gender | 1.000 | ||
| Male:Female | 36:4 | 72:8 | |
| Performance status | 1.000 | ||
| ECOG 0–1 | 40 (100) | 80 (100) | |
| Location | 0.685 | ||
| Upper | 3 (7.5) | 3 (3.8) | |
| Middle | 15 (37.5) | 32 (40.0) | |
| Lower | 22 (55.0) | 45 (56.2) | |
| T status | 1.000 | ||
| T1 | 2 (5.0) | 4 (5.0) | |
| T2 | 3 (7.5) | 7 (8.8) | |
| T3 | 35 (87.5) | 69 (86.2) | |
| N category | 0.558 | ||
| N1 | 18 (45.0) | 44 (55.0) | |
| N2 | 18 (45.0) | 28 (35.0) | |
| N3 | 4 (10.0) | 8 (10.0) | |
| LVI | 16 (40.0) | 19 (23.8) | 0.065 |
| Tumor stage | 0.773 | ||
| IIB | 1 (2.5) | 5 (6.3) | |
| IIIA | 21 (52.5) | 45 (56.2) | |
| IIIB | 14 (35.0) | 22 (27.5) | |
| IIIC | 4 (10.0) | 8 (10.0) | |
| Differentiation | 0.302 | ||
| Well | 4 (10.0) | 17 (21.3) | |
| Moderate | 22 (55.0) | 37 (46.2) | |
| Poor | 14 (35.0) | 26 (32.5) | |
| Lymphadenectomy | 0.685 | ||
| Two-field | 37 (92.5) | 76 (95.0) | |
| Three-field | 3 (7.5) | 4 (5.0) | |