Table 1.
Characteristics by Initial Breast Biopsy Technique
| Needle Biopsy (N=11,073) | Non-Needle Biopsy (N=34,469) | P | ||||
|---|---|---|---|---|---|---|
| Patient Characteristics | ||||||
| Age at Diagnosis | Mean (SD) | 74.5 | 5.3 | 74.1 | 5.3 | <.001 |
| N | % | N | % | |||
|
|
||||||
| Race | White | 9,970 | 90.0 | 31,290 | 90.8 | <.001 |
| Black | 544 | 4.9 | 1,802 | 5.2 | ||
| Other, non-white | 559 | 5.1 | 1,377 | 4.0 | ||
| Hispanic | 319 | 2.9 | 1,165 | 3.4 | .01 | |
| Married at Diagnosis | 5,100 | 46.1 | 16,349 | 47.4 | .01 | |
| Comorbidities | 0 | 4,278 | 38.6 | 13,334 | 38.7 | .16 |
| 1 | 2,002 | 17.8 | 6,111 | 17.7 | ||
| 2 | 478 | 4.2 | 1,444 | 4.2 | ||
| ≥ 3 | 383 | 3.2 | 1,057 | 3.1 | ||
| Missing | 3,932 | 36.1 | 12,523 | 36.3 | ||
| Tumor Characteristics | ||||||
| Tumor Stage | DCIS | 1,248 | 11.3 | 5,449 | 15.8 | <.001 |
| Stage 1 | 5,149 | 46.5 | 19,242 | 55.8 | ||
| Stage 2 | 4,676 | 42.2 | 9,778 | 28.4 | ||
| Tumor Size | < 2cm | 6,801 | 61.4 | 25,351 | 73.6 | <.001 |
| 2–5 cm | 3,567 | 32.2 | 6,556 | 19.0 | ||
| > 5 cm | 192 | 1.7 | 400 | 1.2 | ||
| Unknown | 513 | 4.6 | 2,162 | 6.3 | ||
| Histology | Ductal | 7,938 | 71.7 | 24,493 | 71.1 | .01 |
| Lobular | 1,096 | 9.9 | 3,187 | 3.3 | ||
| Other | 2,039 | 18.4 | 6,789 | 19.7 | ||
| Grade | 1 | 1,689 | 15.3 | 5,457 | 15.8 | <.001 |
| 2 | 3,978 | 35.9 | 11,349 | 32.9 | ||
| 3 | 2,836 | 25.6 | 6,790 | 19.7 | ||
| Other/Unknown | 2,570 | 23.2 | 10,873 | 31.5 | ||
| System Characteristics | ||||||
| Geographic Region | Northeast | 1,441 | 13.0 | 5,255 | 15.3 | <.001 |
| South | 733 | 6.6 | 1,954 | 5.7 | ||
| Midwest | 2,911 | 26.3 | 10,749 | 31.2 | ||
| West | 5,988 | 54.1 | 16,511 | 47.9 | ||
| Urban Residence | 10,102 | 91.2 | 31,051 | 90.1 | <.001 | |
| History of State Assistance | 1,523 | 13.8 | 4,653 | 13.5 | .50 | |
| Received care in teaching hospital | No | 1,051 | 9.5 | 3,240 | 9.4 | .29 |
| Yes | 6,090 | 55.0 | 18,706 | 54.3 | ||
| Missing | 3,932 | 35.5 | 12,523 | 36.3 | ||
*
Non-needle biopsy group includes 1,351 patients with one-step surgery (surgical breast excision without claims for biopsy procedures). Western region includes Hawaii.