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- W2087905904 abstract "Purpose The aim of this study was to examine molecular subtype conversions in patients who underwent neoadjuvant chemotherapy (NAC) and analyze their clinical implications. Materials and Methods We included consecutive breast cancer patients who received NAC at the National Cancer Center, Korea, between August 2002 and June 2011, and had available data on estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor 2 (HER2) receptor status prior to NAC. Molecular subtypes, hormone receptor (HR) status, and ER and PR Allred scores before and after NAC were compared, and the long-term outcomes were analyzed. Results Of 322 patients, 32 (9.9%) achieved a pathologic complete response after NAC. HR+/HER2â tumors tended to convert into triple negative (TN) tumors (10.3%), whereas 34.6% of TN tumors gained HR positivity to become HR+/HER2â tumors. Clinical outcomes of molecular subtype conversion groups were compared against patients who remained as HR+/HER2â throughout. The HR+/HER2â to TN group had significantly poorer recurrence-free survival (RFS) (hazard ratio, 3.54; 95% confidence interval [CI], 1.60 to 7.85) and overall survival (OS) (hazard ratio, 3.73; 95% CI, 1.34 to 10.38). Patients who remained TN throughout had the worst outcomes (for RFS: hazard ratio, 3.70; 95% CI, 1.86 to 7.36; for OS: hazard ratio, 5.85; 95% CI, 2.53 to 13.51), while those who converted from TN to HR+/HER2âshowed improved comparable survival outcomes. Conclusion Molecular subtypes of breast cancers changed frequently after NAC, resulting in different tumor prognostication. Tumor subtyping should be repeated after NAC in patients with breast cancer. Key words: Breast neoplasms, Molecular subtype, Receptor status, Neoadjuvant chemotherapy" @default.
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- W2087905904 date "2016-01-15" @default.
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- W2087905904 title "Impact of Molecular Subtype Conversion of Breast Cancers after Neoadjuvant Chemotherapy on Clinical Outcome" @default.
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- W2087905904 doi "https://doi.org/10.4143/crt.2014.262" @default.
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