The molecular subtype classification is a determinant of sentinel node positivity in early breast carcinoma |
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Authors: | Reyal Fabien Rouzier Roman Depont-Hazelzet Berenice Bollet Marc A Pierga Jean-Yves Alran Severine Salmon Remy J Fourchotte Virginie Vincent-Salomon Anne Sastre-Garau Xavier Antoine Martine Uzan Serge Sigal-Zafrani Brigitte De Rycke Yann |
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Affiliation: | Department of Surgery, Institut Curie, Paris, France. Fabien.reyal@curie.net |
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Abstract: | IntroductionSeveral authors have underscored a strong relation between the molecular subtypes and the axillary status of breast cancer patients. The aim of our work was to decipher the interaction between this classification and the probability of a positive sentinel node biopsy.Materials and MethodsOur dataset consisted of a total number of 2654 early-stage breast cancer patients. Patients treated at first by conservative breast surgery plus sentinel node biopsies were selected. A multivariate logistic regression model was trained and validated. Interaction covariate between ER and HER2 markers was a forced input of this model. The performance of the multivariate model in the training and the two validation sets was analyzed in terms of discrimination and calibration. Probability of axillary metastasis was detailed for each molecular subtype.ResultsThe interaction covariate between ER and HER2 status was a stronger predictor (p = 0.0031) of positive sentinel node biopsy than the ER status by itself (p = 0.016). A multivariate model to determine the probability of sentinel node positivity was defined with the following variables; tumour size, lympho-vascular invasion, molecular subtypes and age at diagnosis. This model showed similar results in terms of discrimination (AUC = 0.72/0.73/0.72) and calibration (HL p = 0.28/0.05/0.11) in the training and validation sets. The interaction between molecular subtypes, tumour size and sentinel nodes status was approximated.DiscussionWe showed that biologically-driven analyses are able to build new models with higher performance in terms of breast cancer axillary status prediction. The molecular subtype classification strongly interacts with the axillary and distant metastasis process. |
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