Table 1 Demographic and tumor characteristics of early onset breast cancer patients
Characteristic | Frequency (n) | % |
|---|---|---|
Age at diagnosis (years) | ||
20–24 | 7 | 2.7 |
25–29 | 55 | 21.6 |
30–34 | 192 | 75.6 |
Race/ethnicity | ||
Non-Hispanic white | 185 | 72.8 |
African-American | 17 | 6.7 |
Hispanic | 33 | 13.0 |
Asian/Pacific islander | 5 | 2.0 |
Native American | 1 | 0.4 |
Other | 13 | 5.1 |
Education | ||
Less than college degree | 143 | 56.3 |
College graduate | 111 | 43.7 |
Histology | ||
Infiltrating duct carcinoma | 193 | 76.0 |
Comedocarcinoma | 15 | 5.9 |
Medullary carcinoma | 9 | 3.5 |
Lobular carcinoma | 8 | 3.2 |
Infiltrating duct and lobular carcinoma | 8 | 3.2 |
Other | 21 | 8.3 |
Stage | ||
Localized | 131 | 51.6 |
Nonlocalized | 116 | 45.7 |
Unknown | 7 | 2.8 |
Grade/differentiation | ||
Grade I/well differentiated | 9 | 3.0 |
Grade II/moderately differentiated | 72 | 24.2 |
Grade III/poorly differentiated | 124 | 41.6 |
Grade IV/undifferentiated | 8 | 2.7 |
Grade not determined/not stated/NA | 85 | 28.5 |
Laterality | ||
Right | 132 | 52.0 |
Left | 122 | 48.0 |
Estrogen receptor status | ||
Positive | 92 | 36.2 |
Negative | 87 | 34.2 |
Borderline | 3 | 1.2 |
Unknown | 72 | 28.3 |
Progesterone receptor status | ||
Positive | 88 | 34.6 |
Negative | 85 | 33.5 |
Borderline | 3 | 1.2 |
Unknown | 78 | 30.7 |
Method of breast cancer detection | ||
Self examination | 205 | 80.7 |
Physician examination | 19 | 7.5 |
Mammography | 17 | 6.7 |
Other | 12 | 4.7 |
Missing | 1 | 0.4 |