2. Theriault RL, Carlson RW, Allred C, Anderson BO, Burstein HJ, Edge SB, et al. Breast cancer, version 3.2013: featured updates to the NCCN guidelines. J Natl Compr Canc Netw. 2013; 11:753–760.
3. Mittra I. Axillary lymph node metastasis in breast cancer: prognostic indicator or lead-time bias? Eur J Cancer. 1993; 29A:300–302.
Article
4. Lindström LS, Karlsson E, Wilking UM, Johansson U, Hartman J, Lidbrink EK, et al. Clinically used breast cancer markers such as estrogen receptor, progesterone receptor, and human epidermal growth factor receptor 2 are unstable throughout tumor progression. J Clin Oncol. 2012; 30:2601–2608.
Article
5. Gancberg D, Di Leo A, Cardoso F, Rouas G, Pedrocchi M, Paesmans M, et al. Comparison of HER-2 status between primary breast cancer and corresponding distant metastatic sites. Ann Oncol. 2002; 13:1036–1043.
Article
6. Guarneri V, Giovannelli S, Ficarra G, Bettelli S, Maiorana A, Piacentini F, et al. Comparison of HER-2 and hormone receptor expression in primary breast cancers and asynchronous paired metastases: impact on patient management. Oncologist. 2008; 13:838–844.
Article
7. Falck AK, Fernö M, Bendahl PO, Rydén L. St Gallen molecular subtypes in primary breast cancer and matched lymph node metastases-aspects on distribution and prognosis for patients with luminal A tumours: results from a prospective randomised trial. BMC Cancer. 2013; 13:558.
8. Turner RR, Ollila DW, Krasne DL, Giuliano AE. Histopathologic validation of the sentinel lymph node hypothesis for breast carcinoma. Ann Surg. 1997; 226:271–276.
Article
9. Rakha EA, Pinder SE, Bartlett JM, Ibrahim M, Starczynski J, Carder PJ, et al. Updated UK recommendations for HER2 assessment in breast cancer. J Clin Pathol. 2015; 68:93–99.
Article
10. Brunelli M, Manfrin E, Martignoni G, Miller K, Remo A, Reghellin D, et al. Genotypic intratumoral heterogeneity in breast carcinoma with HER2/neu amplification: evaluation according to ASCO/CAP criteria. Am J Clin Pathol. 2009; 131:678–682.
Article
11. Broom RJ, Tang PA, Simmons C, Bordeleau L, Mulligan AM, O’Malley FP, et al. Changes in estrogen receptor, progesterone receptor and HER-2/neu status with time: discordance rates between primary and metastatic breast cancer. Anticancer Res. 2009; 29:1557–1562.
12. Simmons C, Miller N, Geddie W, Gianfelice D, Oldfield M, Dranitsaris G, et al. Does confirmatory tumor biopsy alter the management of breast cancer patients with distant metastases? Ann Oncol. 2009; 20:1499–1504.
Article
13. Lower EE, Glass E, Blau R, Harman S. HER-2/neu expression in primary and metastatic breast cancer. Breast Cancer Res Treat. 2009; 113:301–306.
Article
14. Nedergaard L, Haerslev T, Jacobsen GK. Immunohistochemical study of estrogen receptors in primary breast carcinomas and their lymph node metastases including comparison of two monoclonal antibodies. APMIS. 1995; 103:20–24.
Article
15. Aitken SJ, Thomas JS, Langdon SP, Harrison DJ, Faratian D. Quantitative analysis of changes in ER, PR and HER2 expression in primary breast cancer and paired nodal metastases. Ann Oncol. 2010; 21:1254–1261.
Article
16. Yao ZX, Lu LJ, Wang RJ, Jin LB, Liu SC, Li HY, et al. Discordance and clinical significance of ER, PR, and HER2 status between primary breast cancer and synchronous axillary lymph node metastasis. Med Oncol. 2014; 31:798.
Article
17. Wu JM, Fackler MJ, Halushka MK, Molavi DW, Taylor ME, Teo WW, et al. Heterogeneity of breast cancer metastases: comparison of therapeutic target expression and promoter methylation between primary tumors and their multifocal metastases. Clin Cancer Res. 2008; 14:1938–1946.
Article
18. Falck AK, Fernö M, Bendahl PO, Rydén L. Does analysis of biomarkers in tumor cells in lymph node metastases give additional prognostic information in primary breast cancer? World J Surg. 2010; 34:1434–1441.
Article