Abstract
Molecular markers predicting response to preoperative chemotherapy would be of major clinical relevance in breast cancer. Therefore, we studied the relationship between the expression of cell cycle regulatory proteins and clinical outcome in breast cancer patients receiving preoperative chemotherapy. Expression of p21Waf1, p27Kip1, p53, cyclin D3 and Ki-67 was determined in breast carcinomas by means of immunohistochemistry both prior and after preoperative chemotherapy. Expression data were compared with both clinical parameters and response to preoperative chemotherapy with either cyclophosphamide/methotrexate/5-fluorouracil (CMF, n = 29) or epirubicin/docetaxel (ED, n = 36). In paired samples before and after preoperative chemotherapy, the percentage of p21Waf1, p27Kip1, p53 and cyclin D3 positive nuclei of tumor cells in postchemotherapy specimens was significantly higher than the percentage in prechemotherapy samples but no change in Ki-67 expression was observed. High Ki-67 expression (p = 0.02), negative estrogen receptor status (p = 0.01) and negative progesterone receptor status (p = 0.04) were associated with complete pathologic response to chemotherapy, whereas the other markers did not predict response. In conclusion, expression levels of p21Waf1, p27Kip1, p53 and cyclin D3 significantly increased after preoperative chemotherapy in breast carcinomas but only high Ki-67 expression, negative estrogen receptor status and negative progesterone receptor status were associated with complete pathologic response to preoperative chemotherapy.
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Pohl, G., Rudas, M., Taucher, S. et al. Expression of Cell Cycle Regulatory Proteins in Breast Carcinomas Before and After Preoperative Chemotherapy. Breast Cancer Res Treat 78, 97–103 (2003). https://doi.org/10.1023/A:1022165715043
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DOI: https://doi.org/10.1023/A:1022165715043