Molecular subtyping of early-stage breast cancer identifies a group of patients who do not benefit from neoadjuvant chemotherapy

The aim of this study was to analyze the correlation between the pathologic complete response (pCR) rate after neoadjuvant chemotherapy and long-term outcome (distant metastases-free survival [DMFS]) in patients with early-stage breast cancer using BluePrint and MammaPrint molecular subtyping versus...

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Veröffentlicht in:Breast cancer research and treatment 2013-06, Vol.139 (3), p.759-767
Hauptverfasser: Glück, Stefan, de Snoo, Femke, Peeters, Justine, Stork-Sloots, Lisette, Somlo, George
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container_issue 3
container_start_page 759
container_title Breast cancer research and treatment
container_volume 139
creator Glück, Stefan
de Snoo, Femke
Peeters, Justine
Stork-Sloots, Lisette
Somlo, George
description The aim of this study was to analyze the correlation between the pathologic complete response (pCR) rate after neoadjuvant chemotherapy and long-term outcome (distant metastases-free survival [DMFS]) in patients with early-stage breast cancer using BluePrint and MammaPrint molecular subtyping versus clinical subtyping using immunohistochemistry/fluorescence in situ hybridization (IHC/FISH) for the determination of estrogen receptor, progesterone receptor, and human epidermal growth factor receptor-2 (HER2). Data were analyzed from 437 patients in four neoadjuvant chemotherapy trials. BluePrint and MammaPrint outcomes were determined from 44K Agilent arrays, the I-SPY 1 data portal, or Affymetrix U133A arrays. The pCR rate differed substantially among BluePrint molecular subgroups: 6 % in Luminal A-type, 10 % in Luminal B-type, 47 % in HER2-type, and 37 % in Basal-type patients. In the Luminal A-type group ( n  = 90; including seven HER2-positive patients and eight triple-negative patients by IHC/FISH), the 5-year DMFS rate was 93 %. The pCR rate provided no prognostic information, suggesting these patients may not benefit from chemotherapy. Forty-three of 107 (40 %) HER2-positive patients were classified as Luminal-type by BluePrint and may have lower response rates to targeted therapy. Molecular subtyping identified 90 of 435 (21 %) patients as Luminal A-type (BluePrint Luminal-type/MammaPrint Low Risk) with excellent survival. The pCR rate provided no prognostic information. Molecular subtyping can improve the stratification of patients in the neoadjuvant setting: Luminal A-type (MammaPrint Low Risk) patients have a good prognosis with excellent survival and do not seem to benefit from chemotherapy. We observed marked benefit in response and DMFS to neoadjuvant treatment in patients subtyped as HER2-type and Basal-type. BluePrint with MammaPrint molecular subtyping helps to improve prognostic estimation and the choice of therapy versus IHC/FISH.
doi_str_mv 10.1007/s10549-013-2572-4
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Data were analyzed from 437 patients in four neoadjuvant chemotherapy trials. BluePrint and MammaPrint outcomes were determined from 44K Agilent arrays, the I-SPY 1 data portal, or Affymetrix U133A arrays. The pCR rate differed substantially among BluePrint molecular subgroups: 6 % in Luminal A-type, 10 % in Luminal B-type, 47 % in HER2-type, and 37 % in Basal-type patients. In the Luminal A-type group ( n  = 90; including seven HER2-positive patients and eight triple-negative patients by IHC/FISH), the 5-year DMFS rate was 93 %. The pCR rate provided no prognostic information, suggesting these patients may not benefit from chemotherapy. Forty-three of 107 (40 %) HER2-positive patients were classified as Luminal-type by BluePrint and may have lower response rates to targeted therapy. Molecular subtyping identified 90 of 435 (21 %) patients as Luminal A-type (BluePrint Luminal-type/MammaPrint Low Risk) with excellent survival. The pCR rate provided no prognostic information. Molecular subtyping can improve the stratification of patients in the neoadjuvant setting: Luminal A-type (MammaPrint Low Risk) patients have a good prognosis with excellent survival and do not seem to benefit from chemotherapy. We observed marked benefit in response and DMFS to neoadjuvant treatment in patients subtyped as HER2-type and Basal-type. 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Obstetrics ; Humans ; Immunohistochemistry ; In Situ Hybridization, Fluorescence ; Mammary gland diseases ; Medical prognosis ; Medical sciences ; Medicine ; Medicine &amp; Public Health ; Middle Aged ; Molecular biology ; Multiple tumors. Solid tumors. 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Data were analyzed from 437 patients in four neoadjuvant chemotherapy trials. BluePrint and MammaPrint outcomes were determined from 44K Agilent arrays, the I-SPY 1 data portal, or Affymetrix U133A arrays. The pCR rate differed substantially among BluePrint molecular subgroups: 6 % in Luminal A-type, 10 % in Luminal B-type, 47 % in HER2-type, and 37 % in Basal-type patients. In the Luminal A-type group ( n  = 90; including seven HER2-positive patients and eight triple-negative patients by IHC/FISH), the 5-year DMFS rate was 93 %. The pCR rate provided no prognostic information, suggesting these patients may not benefit from chemotherapy. Forty-three of 107 (40 %) HER2-positive patients were classified as Luminal-type by BluePrint and may have lower response rates to targeted therapy. Molecular subtyping identified 90 of 435 (21 %) patients as Luminal A-type (BluePrint Luminal-type/MammaPrint Low Risk) with excellent survival. The pCR rate provided no prognostic information. Molecular subtyping can improve the stratification of patients in the neoadjuvant setting: Luminal A-type (MammaPrint Low Risk) patients have a good prognosis with excellent survival and do not seem to benefit from chemotherapy. We observed marked benefit in response and DMFS to neoadjuvant treatment in patients subtyped as HER2-type and Basal-type. BluePrint with MammaPrint molecular subtyping helps to improve prognostic estimation and the choice of therapy versus IHC/FISH.</abstract><cop>Boston</cop><pub>Springer US</pub><pmid>23756626</pmid><doi>10.1007/s10549-013-2572-4</doi><tpages>9</tpages></addata></record>
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subjects Adjuvant treatment
Adult
Aged
Analysis
Biological and medical sciences
Biomarkers, Tumor - analysis
Biomarkers, Tumor - metabolism
Breast cancer
Breast Neoplasms - drug therapy
Breast Neoplasms - metabolism
Breast Neoplasms - mortality
Breast Neoplasms - pathology
Cancer
Cancer patients
Cancer research
Cancer therapies
Chemotherapy
Chemotherapy, Adjuvant
Clinical Trial
Estrogen
Female
Gynecology. Andrology. Obstetrics
Humans
Immunohistochemistry
In Situ Hybridization, Fluorescence
Mammary gland diseases
Medical prognosis
Medical sciences
Medicine
Medicine & Public Health
Middle Aged
Molecular biology
Multiple tumors. Solid tumors. Tumors in childhood (general aspects)
Neoadjuvant Therapy
Oncology
Progesterone
Prognosis
Receptor, ErbB-2 - analysis
Receptor, ErbB-2 - metabolism
Receptors, Estrogen - analysis
Receptors, Estrogen - metabolism
Receptors, Progesterone - analysis
Receptors, Progesterone - metabolism
Retrospective Studies
Treatment Outcome
Tumors
title Molecular subtyping of early-stage breast cancer identifies a group of patients who do not benefit from neoadjuvant chemotherapy
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