Table 1 Clinicopathological factors according to age group
From: Breast cancer in 30-year-old or younger patients: clinicopathologic characteristics and prognosis
Variables | Group I (age ≤30 years) ( n = 105; %) | Group II (age between 31 and 50 years) ( n = 1,301; %) | P value |
|---|---|---|---|
pT stage | |||
pT1 | 55 (52.4) | 754 (58.0) | |
pT2 | 44 (41.9) | 456 (35.0) | |
pT3/4 | 6 (5.7) | 91 (7.0) | 0.361 |
pN stage | |||
pN0 | 43 (41.0) | 561 (43.1) | |
pN1 | 31 (29.5) | 392 (30.1) | |
pN2 | 17 (16.2) | 172 (13.2) | |
pN3 | 14 (13.3) | 176 (13.5) | 0.859 |
ER level | |||
Percentage ER <10% | 41 (39.0) | 275 (21.1) | |
Percentage ER ≥10% | 64 (61.0) | 1,026 (78.9) | <0.001 |
PR level | |||
Percentage PR <10% | 49 (46.7) | 478 (36.7) | |
Percentage PR ≥10% | 56 (53.3) | 823 (63.3) | 0.043 |
Ki-67 level | |||
Percentage Ki-67 < 20% | 30 (28.6) | 536 (41.2) | |
Percentage Ki-67 ≥ 20% | 75 (71.4) | 765 (58.8) | 0.011 |
Histology | |||
Ductal | 93 (88.6) | 1,098 (84.4) | |
Lobular | 3 (2.9) | 88 (6.8) | |
Other | 9 (8.6) | 115 (8.8) | 0.287 |
Endocrine therapy | |||
Yes | 54 (51.4) | 769 (59.1) | |
No | 51 (48.6) | 532 (40.9) | 0.124 |
Chemotherapy | |||
Yes | 73 (69.5) | 865 (66.5) | |
No | 32 (30.5) | 436 (33.5) | 0.525 |