Variable | No. (%) of patients n = 721 |
---|---|
Age at diagnosis, yr | |
≤ 50 | 149 (20.7) |
51–70 | 364 (50.5) |
> 70 | 208 (28.8) |
Obese (body mass index > 30) | |
Yes | 255 (35.4) |
No | 435 (60.3) |
NOS | 31 (4.3) |
First-degree relative with breast cancer | |
Yes | 159 (22.0) |
No | 519 (72.0) |
NOS | 43 (6.0) |
Smoking status | |
Smoker/previous smoker | 289 (40.1) |
Never smoked | 426 (59.1) |
NOS | 6 (0.8) |
No. of comorbidities | |
0 | 183 (25.4) |
1–2 | 296 (41.0) |
≥ 3 | 242 (33.6) |
Previous breast cancer | 87 (12.1) |
Location of primary imaging | |
Ontario Breast Screening Program | 258 (35.8) |
Hospital | 314 (43.6) |
Nonhospital clinic | 140 (19.4) |
NOS | 9 (1.2) |
Method of tumour identification | |
Asymptomatic screening | 337 (46.7) |
Symptomatic investigation | 383 (53.1) |
NOS | 1 (0.1) |
Imaging in previous 2 yr | |
Yes | 317 (44.0) |
No | 313 (43.4) |
NOS | 91 (12.6) |
Marital status | |
Married | 447 (62.0) |
Not married | 272 (37.7) |
NOS | 2 (0.3) |
Employment status | |
Employed | 277 (38.4) |
Not employed | 430 (59.6) |
NOS | 14 (1.9) |
Income quintile | |
1 (lowest) | 147 (20.4) |
2 | 141 (19.6) |
3 | 148 (20.5) |
4 | 140 (19.4) |
5 (highest) | 139 (19.3) |
NOS | 6 (0.8) |
% of census tract population who completed college or university | |
> 40 | 304 (42.2) |
31–40 | 237 (32.9) |
< 31 | 177 (24.5) |
NOS | 3 (0.4) |
% of census tract population who immigrated in previous 5 yr | |
> 30 | 199 (27.6) |
21–30 | 224 (31.1) |
< 21 | 295 (40.9) |
NOS | 3 (0.4) |
Type of breast surgery | |
Breast-conserving | 393 (54.5) |
Mastectomy | 276 (38.3) |
No surgery | 52 (7.2) |
Type of nodal surgery | |
Sentinel lymph node biopsy | 317 (44.0) |
Axillary lymph node dissection* | 228 (31.6) |
No nodal surgery | 176 (24.4) |
Breast reconstruction after mastectomy (n = 276) | 67 (24.3) |
Tumour stage | |
Tis | 74 (10.3) |
T1 | 291 (40.4) |
T2 | 223 (30.9) |
T3–T4 | 133 (18.4) |
Nodal stage | |
N0 | 365 (50.6) |
N1–N3 | 228 (31.6) |
NX | 127 (17.6) |
NOS | 1 (0.1) |
Disease stage (TNM) | |
0–1 | 323 (44.8) |
2 | 222 (30.8) |
3–4 | 176 (24.4) |
Estrogen receptor/progesterone receptor status† (n = 637) | |
Positive | 536 (84.1) |
Negative | 101 (15.8) |
Tumour grade | |
I | 145 (20.1) |
II | 362 (50.2) |
III | 175 (24.3) |
NOS | 39 (5.4) |
Histologic type† (n = 647) | |
Ductal | 529 (81.8) |
Lobular‡ | 78 (12.0) |
Other (e.g., mucinous, tubular) | 32 (4.9) |
NOS | 8 (1.2) |
Chemotherapy§ | |
Yes | 256 (35.5) |
No | 461 (63.9) |
NOS | 4 (0.6) |
Hormonal therapy§ | |
Yes | 395 (54.8) |
No | 322 (44.7) |
NOS | 4 (0.6) |
Radiation therapy | 460 (63.8) |
Recurrent breast cancer | 50 (6.9) |
No treatment | 5 (0.7) |
Neoadjuvant treatment | 79 (11.0) |