Table 2.
Characteristics of HER2-positive breast cancer cases
| Tumor (N = 92) | Adjacent normal (N = 34) | |||
|---|---|---|---|---|
| n | Percent of total | n | Percent of total | |
| Age group | ||||
| 25–49 | 33 | 36 | 13 | 38 |
| 50–69 | 49 | 53 | 17 | 50 |
| ≥70 | 9 | 10 | 4 | 12 |
| Unknown | 1 | 1 | 0 | 0 |
| Race/ethnicity | ||||
| Caucasian | 27 | 29 | 10 | 29 |
| Japanese | 36 | 39 | 11 | 32 |
| Native Hawaiian | 28 | 30 | 13 | 38 |
| Unknown | 1 | 1 | 0 | 0 |
| Histology | ||||
| In filtrating ductal carcinoma | 87 | 95 | ||
| Lobular carcinoma | 3 | 3 | ||
| Other | 1 | 1 | ||
| Unknown | 1 | 1 | ||
| Grade | ||||
| 1 | 4 | 4 | ||
| 2 | 20 | 22 | ||
| 3 | 67 | 73 | ||
| Unknown | 1 | 1 | ||
| Stage | ||||
| 1 | 20 | 22 | ||
| 2A | 46 | 50 | ||
| 2B-4 | 25 | 27 | ||
| Unknown | 1 | 1 | ||
| ER | ||||
| Negative | 43 | 47 | ||
| Positive | 48 | 52 | ||
| Unknown | 1 | 1 | ||
| PR | ||||
| Negative | 37 | 40 | ||
| Positive | 54 | 59 | ||
| Unknown | 1 | 1 | ||
| ER and PR | ||||
| ER−PR− | 34 | 37 | ||
| ER−PR+ | 9 | 10 | ||
| ER+PR− | 3 | 3 | ||
| ER+PR+ | 45 | 49 | ||
| Unknown | 1 | 1 | ||
| Vital status | ||||
| Alive | 83 | 90 | ||
| Deceased | 8 | 9 | ||
| Unknown | 1 | 1 | ||