Table 1 Demographics, clinical characteristics, and family history of patients
Patient characteristics | Number (%) |
|---|---|
Total number of patients | 290 (100.0) |
Race/ethnicity | |
Chinese | 201 (69.3) |
Malay | 19 (6.6) |
Indian | 17 (5.9) |
Caucasian | 4 (1.4) |
Filipino | 4 (1.4) |
Indonesian | 3 (1.0) |
Vietnamese | 3 (1.0) |
Arab | 2 (0.7) |
Bengali | 1 (0.3) |
Burmese | 1 (0.3) |
Gujarati | 1 (0.3) |
Tamil | 1 (0.3) |
Others | 30 (10.3) |
Not reported | 3 (1.0) |
Age at breast cancer diagnosis | |
Median | 37.0 yrs |
Range | 19–75 yrs |
≤ 40 | 225 (77.6) |
≥ 41 | 65 (22.4) |
Family history of breast cancer (n = 138) | |
At least first-degree | 78 (26.9) |
At least second-degree | 43 (14.8) |
At least third-degree | 16 (5.5) |
Unspecified | 1 (0.3) |
Family history of other cancers (n = 48) | |
At least first-degree | 20 (6.9) |
At least second-degree | 28 (9.7) |
Histology | |
Ductal carcinoma in situ (DCIS) | 14 (4.8) |
Infiltrating ductal carcinoma (IDC) | 180 (62.1) |
Infiltrating lobular carcinoma (ILC) | 7 (2.4) |
Mucinous carcinoma | 9 (3.1) |
Medullary carcinoma | 2 (0.7) |
Encapsulated papillary carcinoma | 1 (0.3) |
Tubulolobular carcinoma | 1 (0.3) |
DCIS + Lobular carcinoma in situ | 1 (0.3) |
DCIS + IDC + Mucinous | 2 (0.7) |
IDC + ILC | 5 (1.7) |
IDC + Invasive micropapillary carcinoma | 1 (0.3) |
IDC + Medullary | 1 (0.3) |
Subtype not defineda | 66 (22.8) |
Hormone and HER2 status | |
ER | |
Positive | 182 (62.8) |
Negative | 68 (23.4) |
Not tested/unknowna | 40 (13.8) |
PR | |
Positive | 158 (54.5) |
Negative | 90 (31) |
Not tested/unknowna | 42 (14.5) |
HER2 | |
Positive | 77 (26.6) |
Negative | 150 (51.7) |
Not tested/unknown/equivocala | 63 (21.7) |