The characteristics of traditional pathological parameters in the different age groups
| Pathological parameters | No. of patients (%) | X2 | P values | |||
| All patients (n=1042) | 20 –40 years (n=115) | 41–60 years (n=599) | ≥61 years (n=328) | |||
| In situ and invasive breast cancer | ||||||
| Tumour size | 23.32 | 0.010 | ||||
| TX | 202 (19.4) | 39 (33.9) | 115 (19.2) | 48 (14.6) | ||
| T1 | 352 (33.7) | 34 (29.6) | 203 (33.9) | 114 (34.8) | ||
| T2 | 420 (40.3) | 38 (33.0) | 241 (40.2) | 141 (43.0) | ||
| T3 | 32 (3.1) | 2 (1.7) | 19 (3.2) | 11 (3.3) | ||
| T4 | 36 (3.5) | 2 (1.7) | 21 (3.5) | 13 (4.0) | ||
| Lymph nodes | 22.27 | 0.001 | ||||
| NX | 382 (36.7) | 62 (53.9) | 206 (34.4) | 114 (34.8) | ||
| N0 | 408 (39.2) | 33 (28.7) | 230 (38.4) | 145 (44.2) | ||
| N1 | 250 (24.0) | 20 (17.4) | 162 (27.0) | 68 (20.7) | ||
| N2 | 2 (0.2) | 0 (0.0) | 1 (0.2) | 1 (0.3) | ||
| Grade | 8.37 | 0.212 | ||||
| Not detected | 399 (38.3) | 53 (46.1) | 217 (36.2) | 129 (39.3) | ||
| High histological grade | 76 (7.3) | 9 (7.8) | 49 (8.2) | 18 (5.5) | ||
| Intermediate histological grade | 478 (45.9) | 45 (39.1) | 286 (47.8) | 147 (44.8) | ||
| Low histological grade | 89 (8.5) | 8 (7.0) | 47 (7.8) | 34 (10.4) | ||
| Invasive breast cancer | ||||||
| Auxillary staging | 15.12 | 0.004 | ||||
| No description | 133 (14.2) | 20 (19.8) | 78 (14.4) | 35 (11.9) | ||
| With auxiliary staging | 610 (65.0) | 49 (48.5) | 363 (67.0) | 198 (67.1) | ||
| Without auxiliary staging | 195 (20.8) | 32 (31.7) | 101 (18.6) | 62 (21.0) | ||
| Margins | 9.63 | 0.055 | ||||
| Not detected | 294 (31.4) | 44 (43.6) | 168 (31.1) | 82 (27.8) | ||
| No residual cancer | 617 (65.8) | 56 (55.4) | 358 (66.2) | 203 (68.8) | ||
| With residual cancer | 26 (2.8) | 1 (1.0) | 15 (2.8) | 10 (3.4) | ||
| Vascular tumour invasion | 7.47 | 0.102 | ||||
| Not detected | 436 (46.5) | 54 (53.5) | 239 (44.2) | 143 (48.5) | ||
| No | 403 (43.0) | 35 (34.7) | 238 (44.0) | 130 (44.1) | ||
| Yes | 98 (10.5) | 12 (11.9) | 64 (11.8) | 22 (7.5) | ||
| Nerve infiltration | 4.19 | 0.380 | ||||
| Not detected | 913 (97.4) | 98 (97.0)) | 528 (97.6) | 287 (97.3) | ||
| No | 14 (1.5) | 3 (3.0) | 8 (1.5) | 1 (1.0) | ||
| Yes | 10 (1.1) | 0 (0.0) | 5 (0.9) | 5 (1.7) | ||