Estrogen receptor immunohistochemistry cutoff value: Standardization is needed - Reply

References 

1. Baddoura FK, Cohen C, Unger ER, DeRose PB, Chenggis M. Image analysis for quantitation of estrogen receptor in formalin-fixed paraffin-embedded sections of breast carcinoma. Mod Pathol. 1991;4:91–95
   • MEDLINE
2. Phillips T, Murray G, Wakamiya K, et al. Development of standard estrogen and progesterone receptor immunohistochemical assays for selection of patients for antihormonal therapy. Appl Immunohistochem Mol Morphology. 2007;15:325–331
3. Elledge RM, Green S, Pugh R, et al. Estrogen receptor (ER) and progesterone receptor (PgR), by ligand-binding Assay Compared with ER, PgR and pS2, by immunohistochemistry in predicting response to tamoxifen in metastatic breast cancer: A Southwest Oncology Group Study. Cancer. 2000;89:111–117
4. Wolff AC, Hammond EH, Schwartz JN, et al. American Society of Clinical Oncology/College of American Pathologists Guideline recommendations for human epidermal growth factor receptor 2 testing in breast cancer. Clin Oncol. 2007;25:118–145
5. Yaziji H, Taylor CR, Goldstein NS, et al. Consensus recommendations on estrogen receptor testing in breast cancer by immunohistochemistry. Appl Immunohistochem Mol Morphol. 2008;16:513–520