Variables | pT1a tumor (n = 161) | pT1b1 tumor (n = 43) | pT1b2 tumor (n = 123) | |||
---|---|---|---|---|---|---|
 | pN(+) | p-value | pN(+) | p-value | pN(+) | p-value |
Total | 4/161 (2.5%) | Â | 4/43 (9.3%) | Â | 37/123 (30.1%) | Â |
   Sex |  | 0.6269 |  | 0.2802 |  | 0.8309 |
   Male | 3/88 (3.4%) |  | 4/28 (14.3%) |  | 26/88 (29.6%) |  |
   Female | 1/73 (1.4%) |  | 0/15 |  | 11/35 (31.4%) |  |
Age | Â | 0.6332 | Â | 0.3449 | Â | 0.8432 |
   < 65 | 3/91 (3.3%) |  | 3/21 (14.3%) |  | 16/51 (31.4%) |  |
   65 ≤ | 1/70 (1.4%) |  | 1/22 (4.6%) |  | 21/72 (29.2%) |  |
Main tumor site | Â | 0.1903 | Â | 0.2707 | Â | 0.1129 |
   Upper | 0/19 |  | 0/3 |  | 3/21 (14.3%) |  |
   Middle | 4/89 (4.5%) |  | 4/27 (14.8%) |  | 17/59 (28.8%) |  |
   Lower | 0/53 |  | 0/13 |  | 17/43 (39.5%) |  |
Clinical macro type | Â | 0.5655 | Â | 0.5579 | Â | 0.4764 |
   Depressed or excavated | 3/131 (2.3%) |  | 4/33 (12.1%) |  | 27/96 (28.1%) |  |
   Flat or elevated | 1/30 (3.3%) |  | 0/10 |  | 10/27 (37.0%) |  |
Pathological macro type | Â | 1.0000 | Â | 1.0000 | Â | 0.4764 |
   Depressed | 4/139 (2.9%) |  | 4/37 (10.8%) |  | 27/96 (28.1%) |  |
   Flat or elevated | 0/22 |  | 0/6 |  | 10/27 (37.0%) |  |
Ulceration | Â | 0.1287 | Â | 0.3235 | Â | 0.4200 |
   No | 0/72 |  | 1/23 (4.4%) |  | 21/77 (27.3%) |  |
   Yes | 4/89 (4.5%) |  | 3/20 (15.0%) |  | 16/46 (34.8%) |  |
Main histologic type | Â | 0.1252 | Â | 0.4672 | Â | 0.8441 |
   Differentiated | 0/74 |  | 2/29 (6.9%) |  | 19/66 (28.8%) |  |
   Undifferentiated | 4/87 (4.6%) |  | 2/14 (14.3%) |  | 18/57 (31.6%) |  |
Pathological tumor size | Â | 1.0000 | Â | 1.0000 | Â | 0.0589 |
   ≤20 mm | 1/60 (1.7%) |  | 0/7 |  | 4/28 (14.3%) |  |
   20 mm< | 3/101 (2.5%) |  | 4/36 (11.1%) |  | 33/95 (34.7%) |  |
Pathological tumor size | Â | 0.3083 | Â | 1.0000 | Â | 0.1730 |
   ≤30 mm | 1/96 (1.0%) |  | 2/21 (9.5%) |  | 13/55 (23.6%) |  |
   30 mm< | 3/65 (4.6%) |  | 2/22 (9.1%) |  | 24/68 (35.3%) |  |
Lymphatic invasion †|  | 0.0731 |  | 0.5227 |  | < 0.0001** |
   L0 | 3/158 (1.9%) |  | 3/36 (8.3%) |  | 4/52 (7.7%) |  |
   L1-2 | 1/3 (33.3%) |  | 1/7 (14.3%) |  | 33/71 (46.5%) |  |
Venous invasion †|  | 1.0000 |  | 1.0000 |  | 0.4200 |
   V0 | 4/160 (2.5%) |  | 4/42 (9.5%) |  | 21/77 (27.3%) |  |
   V1-3 | 0/1 |  | 0/1 |  | 16/46 (34.8%) |  |