Table 1 .
Percentage of Breast Cancers Reported as HER2 Positive in California by Countya
| County | Total No. of Breast Cancers | HER2 Positive, % |
|---|---|---|
| Marin | 1,148 | 11.6 |
| San Luis Obispo | 958 | 12.1 |
| Santa Barbara | 1,304 | 12.2 |
| Butte | 818 | 12.7 |
| Napa | 434 | 13.8 |
| Contra Costa | 3,529 | 13.9 |
| Tuolumne | 214 | 14.0 |
| Ventura | 2,370 | 14.3 |
| Riverside | 4,770 | 14.4 |
| San Diego | 8,329 | 14.5 |
| Kings | 241 | 14.5 |
| Monterey | 1,027 | 14.7 |
| El Dorado | 583 | 14.8 |
| Fresno | 2,118 | 14.8 |
| Humboldt | 411 | 14.8 |
| San Mateo | 2,593 | 14.8 |
| Alameda | 4,471 | 15.2 |
| Sutter | 268 | 15.7 |
| Madera | 348 | 15.8 |
| Kern | 1,508 | 16.0 |
| Placer | 1,194 | 16.1 |
| Solano | 1,214 | 16.1 |
| Orange | 8,463 | 16.5 |
| Santa Clara | 4,750 | 16.5 |
| Tolo | 517 | 16.8 |
| Sonoma | 1,722 | 16.8 |
| Sacramento | 3,684 | 17.2 |
| Nevada | 469 | 17.3 |
| Santa Cruz | 584 | 17.3 |
| Stanislaus | 1,135 | 18.4 |
| San Joaquin | 1,331 | 18.6 |
| San Francisco | 2,411 | 18.7 |
| Los Angeles | 24,279 | 18.9 |
| Merced | 463 | 19.0 |
| San Bernardino | 4,321 | 21.2 |
| Tulare | 726 | 21.6 |
| Imperial | 294 | 22.1 |
| Shasta | 565 | 26.0 |
| Overall | 95,564 | Median 15.9 |
HER2, human epidermal growth factor receptor 2.
aCounties with less than 200 cases excluded.