Table 1. Patients and tumor characteristics.
| Variable | Total no. of cases (% of total) | Supraclavicular nodes | Upper abdominal nodes | ||||||
|---|---|---|---|---|---|---|---|---|---|
| No. of positive (% of total) | No. of negative (% of total) | χ2 | P value | No. of positive (% of total) | No. of negative (% of total) | χ2 | P value | ||
| Sex | 1.434 | 0.231 | 2.928 | 0.087 | |||||
| Male | 234 (79.9) | 143 (82.2) | 91 (76.5) | 100 (84.7) | 134 (76.6) | ||||
| Female | 59 (20.1) | 31 (17.8) | 28 (23.5) | 18 (15.3) | 41 (23.4) | ||||
| Age | 1.007 | 0.316 | 0.136 | 0.712 | |||||
| ≥70 | 113 (38.6) | 63 (36.2) | 50 (42) | 44 (37.3) | 69 (39.4) | ||||
| <70 | 180 (61.4) | 111 (63.8) | 69 (58) | 74 (62.7) | 106 (60.6) | ||||
| Tumor location | 7.216 | 0.027* | 0.562 | 0.755 | |||||
| Upper | 100 (34.1) | 70 (40.2) | 30 (25.2) | 43 (36.4) | 57 (32.6) | ||||
| Middle | 108 (36.9) | 57 (32.8) | 51 (42.9) | 43 (36.4) | 65 (37.1) | ||||
| Lower | 85 (29) | 47 (27) | 38 (31.9) | 32 (27.1) | 53 (30.3) | ||||
| T stage | 5.013 | 0.082 | 4.571 | 0.102 | |||||
| T1-2 | 40 (13.7) | 15 (8.6) | 20 (16.8) | 10 (8.5) | 30 (17.1) | ||||
| T3 | 115 (39.2) | 78 (44.8) | 44 (37) | 48 (40.7) | 67 (38.3) | ||||
| T4 | 138 (47.1) | 81 (46.6) | 55 (46.2) | 60 (50.8) | 78 (44.6) | ||||
| N stage | 1.067 | 0.587 | 3.432 | 0.18 | |||||
| N1 | 65 (22.2) | 35 (20.1) | 30 (25.2) | 20 (16.9) | 45 (25.7) | ||||
| N2 | 121 (41.3) | 74 (42.5) | 47 (39.5) | 50 (42.4) | 71 (40.6) | ||||
| N3 | 107 (36.5) | 65 (37.4) | 42 (35.3) | 48 (40.7) | 59 (33.7) | ||||
| TNM stage | 2.245 | 0.325 | 5.615 | 0.06 | |||||
| II | 14 (4.8) | 6 (3.4) | 8 (6.7) | 3 (2.5) | 11 (6.3) | ||||
| III | 248 (84.6) | 148 (85.1) | 101 (84.9) | 107 (90.7) | 141 (80.6) | ||||
| IV | 31 (10.6) | 20 (11.5) | 10 (8.4) | 8 (6.8) | 23 (13.1) | ||||
| Supraclavicular nodes | 283 | 0.000*** | 0.793 | 0.373 | |||||
| Positive | 174 (59.4) | 174 (100) | 0 (0) | 66 (55.9) | 101 (61.2) | ||||
| Negative | 119 (40.6) | 0 (0) | 119 (100) | 52 (44.1) | 64 (38.8) | ||||
| Upper abdominal nodes | 0.793 | 0.373 | 283 | 0.000*** | |||||
| Positive | 118 (40.3) | 66 (39.5) | 52 (44.8) | 118 (100) | 0 (0) | ||||
| Negative | 175 (59.7) | 101 (60.5) | 64 (55.2) | 0 (0) | 175 (100) | ||||
| Treatment modality | 0.018 | 0.892 | 3.288 | 0.07 | |||||
| Chemoradiotherapy | 213 (72.7) | 127 (73) | 86 (72.3) | 79 (66.9) | 134 (76.6) | ||||
| Radiotherapy alone | 80 (27.3) | 47 (27) | 33 (27.7) | 39 (33.1) | 41 (23.4) | ||||
| Radiation dose | 1.794 | 0.18 | 4.529 | 0.033* | |||||
| ≥60 Gy | 166 (56.7) | 93 (53.4) | 73 (61.3) | 58 (49.2) | 108 (61.7) | ||||
| <60 Gy | 127 (43.3) | 81 (46.6) | 46 (38.7) | 60 (50.8) | 67 (38.3) | ||||
*, P < 0.05; **, P < 0.01; ***, P < 0.001.