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Karger Publishers, Oncology, 5-6(79), p. 324-330, 2010

DOI: 10.1159/000322192

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Molecular Subtypes and Tumor Response to Neoadjuvant Chemotherapy in Patients with Locally Advanced Breast Cancer

This paper is available in a repository.
This paper is available in a repository.

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Abstract

<i>Objective:</i> Pathologic complete response (pCR) is the most predictive factor for patients with neoadjuvant chemotherapy and we investigated the rate of pCR according to molecular subtypes defined by immunohistochemical staining. <i>Methods:</i> Our subjects comprised 257 breast cancer patients who received 3 cycles of anthracycline/taxane-based neoadjuvant chemotherapy. The patients were classified into 4 subtypes: luminal A, luminal B, HER2 and triple negative. We analyzed the pCR rate and treatment outcome according to these subtypes. <i>Results:</i> Of a total of 257 patients, the pCR rate of luminal A, luminal B, HER2 and triple negative was 3.9, 5.0, 10.5 and 21.1%, respectively (p = 0.001). The 5-year disease-free survival of the pCR group (88.4%) was higher than that of the non-pCR group (65.6%), but it was not significant (p = 0.228). Among patients who have residual disease, the 5-year disease-free survival of luminal A, luminal B, HER2 and triple negative was 64.0, 65.7, 75.2 and 66.5%, respectively (p = 0.243). Triple negative and HER2 subtypes are more sensitive to neoadjuvant chemotherapy. <i>Conclusion:</i> To increase the pCR rate, type-specific approaches according to subtypes, such as an addition of trastuzumab, increasing the number of cycles or a novel regimen, should be considered.