| In Situ | Localized/Regional | Distant/Unstaged | |||||||
| Primary Site (ICD-O) (1) | Cases | (%) | (%) (2) | Cases | (%) | (%) (2) | Cases | (%) | (%) (2) |
| Nipple and areola (174.0) | 152 | 1.3 | 1.7 | 964 | 1.2 | 1.4 | 66 | 0.9 | 1.6 |
| Central breast (174.1) | 741 | 6.5 | 8.3 | 4,989 | 6.4 | 7.3 | 353 | 4.7 | 8.8 |
| Upper-inner quadrant (174.2) | 758 | 6.6 | 8.4 | 7,410 | 9.5 | 10.8 | 347 | 4.6 | 8.6 |
| Lower-inner quadrant (174.3) | 609 | 5.3 | 6.8 | 3,840 | 4.9 | 5.6 | 204 | 2.7 | 5.1 |
| Upper-outer quadrant (174.4) | 3,988 | 34.9 | 44.4 | 30,460 | 39 | 44.3 | 1,555 | 20.5 | 38.7 |
| Lower-outer quadrant (174.5) | 666 | 5.8 | 7.4 | 5,022 | 6.4 | 7.3 | 263 | 3.5 | 6.6 |
| Axillary tail (174.6) | 38 | 0.3 | 0.4 | 707 | 0.9 | 1 | 60 | 0.8 | 1.5 |
| Midline, inner, outer, upper or lower (174.8) | 2,027 | 17.7 | 22.6 | 15,390 | 19.7 | 22.4 | 1,170 | 15.4 | 29.1 |
| Breast, NOS (174.9) | 2,457 | 21.5 | -- | 9,237 | 11.8 | -- | 3,559 | 47 | -- |
| Total | 11,436 | 100% | 100% | 78,019 | 100% | 100% | 7,577 | 100% | 100% |
Source: California Cancer Registry, November 1994. Excludes lymphohematopoietic neoplasms of the breast (ICD-O, Field Trial edition, histology codes 9590-9970) (2).
1 Numbers in parentheses are ICD-O, Field Trial edition, primary site codes (2). NOS=not otherwise specified.
2Percent distribution excluding cases with site listed as "Breast, NOS (174.9)".
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