TABLE 2.
Biomarker Testing Type and Results in the Full EHR Data Set
| Biomarker | Full EHR Data Set (N = 2,982)a |
|---|---|
| HER2, No. (%) | 612 (21) |
| Equivocal | 66 (11) |
| Negative | 449 (73) |
| Positive | 75 (12) |
| Unknownb | 22 (4) |
| MMR/MSI, No. (%) | 1,604 (54) |
| Equivocal | NRc |
| Loss of MMR protein expression (MMR protein deficiency) | 369 (23) |
| MSI-ambiguous | NRc |
| MSI-high | 38 (2) |
| MSI-low | NRc |
| MSS | 211 (13) |
| Normal MMR protein expression | 902 (56) |
| Unknownb | 77 (5) |
| ER/PR, No. (%) | 1,465 (49) |
| Indeterminate result | NRc |
| Negative | 288 (20) |
| Positive | 1,129 (77) |
| Unknown | 47 (3) |
Abbreviations: EHR, electronic health record; ER, estrogen receptor; HER2, human epidermal growth factor receptor 2; MMR, DNA mismatch repair; MSI, microsatellite instability; MSS, microsatellite stable; NR, not reported; PR, progesterone receptor.
a
Percentages are testing rates among all patients and result rates among patients who received testing.
b
Included pending, unknown, and unsuccessful/indeterminate tests.
c
The number of patients was not reported because of a sample size of ≤5.