| n | Percent (%) | tumour regression grade (Becker) | tumour regression grade (Japan) | ||||
---|---|---|---|---|---|---|---|---|
TRG 1a-1b | % | P value | Grade 2–3 | % | P value | |||
Age | Â | Â | Â | Â | 0.168 | Â | Â | 0.231 |
 < 60 | 80 | 45.7 | 24 | 30.0 |  | 34 | 42.5 |  |
 ≥60 | 95 | 54.3 | 38 | 40.0 |  | 49 | 51.6 |  |
Gender | Â | Â | Â | Â | 0.530 | Â | Â | 0.935 |
 Female | 27 | 15.4 | 11 | 40.7 |  | 13 | 48.1 |  |
 Male | 148 | 84.6 | 51 | 34.5 |  | 70 | 47.3 |  |
Anatomic location | Â | Â | Â | Â | 0.118 | Â | Â | 0.221 |
 Upper third | 29 | 16.6 | 15 | 51.7 |  | 18 | 62.0 |  |
 Middle third | 82 | 46.9 | 25 | 30.5 |  | 37 | 45.1 |  |
 Lower third | 64 | 36.6 | 22 | 34.4 |  | 28 | 43.8 |  |
Size |  |  |  |  | 0.004 |  |  | < 0.001 |
 < 3 cm | 90 | 51.4 | 41 | 45.6 |  | 58 | 64.4 |  |
 ≥3 cm | 85 | 48.6 | 21 | 24.7 |  | 25 | 29.4 |  |
Lymphovascular invasion |  |  |  |  | < 0.001 |  |  | < 0.001 |
 Negative | 118 | 67.4 | 59 | 50.0 |  | 70 | 59.3 |  |
 Positive | 57 | 32.6 | 3 | 5.3 |  | 13 | 22.8 |  |
Perineural growth |  |  |  |  | < 0.001 |  |  | < 0.001 |
 Negative | 119 | 68.0 | 58 | 48.7 |  | 73 | 61.3 |  |
 Positive | 56 | 32.0 | 4 | 7.1 |  | 10 | 17.9 |  |
Lymph-node metastasis |  |  |  |  | < 0.001 |  |  | < 0.001 |
 Negative | 92 | 52.6 | 46 | 50.0 |  | 57 | 62.0 |  |
 Positive | 83 | 47.4 | 16 | 19.3 |  | 26 | 31.3 |  |
ypN-stage |  |  |  |  | < 0.001 |  |  | < 0.001 |
 ypN0 | 92 | 52.6 | 46 | 50.0 |  | 57 | 62.0 |  |
 ypN1 | 51 | 29.1 | 12 | 30.8 |  | 20 | 39.2 |  |
 ypN2 | 23 | 13.1 | 4 | 17.4 |  | 6 | 26.1 |  |
 ypN3 | 9 | 5.1 | 0 | 0 |  | 0 | 0 |  |
Type of neoadjuvant |  |  |  |  | < 0.001 |  |  | < 0.001 |
 Chemotherapy | 108 | 61.7 | 23 | 21.3 |  | 30 | 27.8 |  |
 Chemoradiotherapy | 67 | 38.3 | 39 | 58.2 |  | 53 | 79.1 |  |
tumour regression grade (Becker) | ||||||||
 TRG1a | 26 | 14.9 |  |  |  |  |  |  |
 TRG1b | 36 | 20.6 |  |  |  |  |  |  |
 TRG2 | 33 | 18.9 |  |  |  |  |  |  |
 TRG3 | 80 | 45.7 |  |  |  |  |  |  |
tumour regression grade (Japan) | ||||||||
 G0-1a | 64 | 36.6 |  |  |  |  |  |  |
 G1b | 28 | 16.0 |  |  |  |  |  |  |
 G2 | 57 | 32.6 |  |  |  |  |  |  |
 G3 | 26 | 14.9 |  |  |  |  |  |  |