Table 1.
Clinicopathologic characteristics of breast cancer patients in Southern China and SEER cohorts.
| Patient characteristics | Southern China | SEER | χ2-value | P value |
|---|---|---|---|---|
| N (%) | N (%) | |||
| Age at diagnosis (year) | 0.009 | 0.923 | ||
| Young adult group (< 40) | ||||
| < 35 | 38 (7.45) | 1495 (2.28) | ||
| ≥ 35 | 63 (12.35) | 2529 (3.86) | ||
| Middle aged group (40–70) | 163.919 | 0.000 | ||
| ≤ 48 | 194 (38.04) | 9105 (13.89) | ||
| > 48 | 202 (39.61) | 32,151 (49.06) | ||
| Aged + group(> 70) | 0.077 | 0.048 | ||
| ≤ 75 | 8 (1.57) | 7151 (10.91) | ||
| > 75 | 5 (0.98) | 13,104 (20.00) | ||
| Tumor size(cm) | 29.923 | 0.000 | ||
| Tx | 10 (2.01) | 51 (0.08) | ||
| Tis | 1 (0.20) | 1 (0) | ||
| Invasive group | ||||
| ≤ 2 | 79 (15.86) | 934 (1.43) | ||
| > 2 ≤ 5 | 323 (64.86) | 367 (0.56) | ||
| > 5 | 46 (9.24) | 63 (0.1) | ||
| Missing | 39 (7.83) | 64,071 (97.8) | ||
| Nodal stage | 20,387.140 | 0.000 | ||
| pN0, no nodal metastasis | 206 (40.39) | 1145 (1.75) | ||
| pN1, 1–3 nodal metastasis | 132 (25.88) | 222 (0.34) | ||
| pN2, 4–9 nodal metastasis | 76 (14.90) | 34 (0.05) | ||
| pN3, ≥ 10 nodal metastasis | 49 (9.61) | 40 (0.06) | ||
| Unknown | 47 (9.22) | 64,094 (97.80) | ||
| Pathological stage | 25.662 | 0.000 | ||
| 0–1 | 97 (19.02) | 7082 (10.82) | ||
| 2 | 262 (51.37) | 14,936 (22.81) | ||
| 3 | 133 (26.08) | 12,993 (19.75) | ||
| 4 | 18 (3.53) | 1255 (1.92) | ||
| Unknown | 0 (0) | 29,269 (44.7) | ||
| Estrogen receptor | 106.162 | 0.000 | ||
| Negative | 178 (34.9) | 5563 (17.96) | ||
| Positive | 290 (56.86) | 20,233 (65.34) | ||
| Missing | 42 (8.24) | 5172 (16.70) | ||
| Progesterone receptor | 30.794 | 0.000 | ||
| Negative | 182 (35.69) | 8110 (26.2) | ||
| Positive | 270 (52.94) | 179,194 (55.55) | ||
| Missing | 58 (11.37) | 5646 (18.24) | ||
| HER2-positive | 611.595 | 0.000 | ||
| Negative | 165 (32.35) | 1530 (85.62) | ||
| Positive | 283 (55.49) | 169 (9.46) | ||
| Missing | 62 (12.16) | 88 (4.92) | ||
| Ki-67(%) | NA | NA | ||
| < 14 | 100 (19.61) | NA (NA) | ||
| < 51.7 median | 170 (33.33) | NA (NA) | ||
| ≥ 51.7 median | 95 (18.63) | NA (NA) | ||
| Missing | 145(28.43) | NA (NA) | ||