Relationship between lymphovascular invasion and molecular subtypes in invasive breast cancer.

PURPOSE: The aim of this study is to evaluate the relation between LVI and molecular subtypes in invasive breast cancers and to find out whether LVI which is a histopathologic indicator has a role in subtype classification or not. METHODS: One hundred and seventy-six patients who had mastectomy for breast cancer between 2013 and 2018 in the Department of Surgical Oncology, Faculty of Medicine, Ankara University were retrospectively analysed. One hundred and thirty-two patients who had LVI, ER, PR, Her 2 and Ki-67 index status information provided in their pathology results were included in the study. The relationship between molecular subtypes and LVI was investigated. RESULTS: One hundred and thirty-two patients were analysed retrospectively. Eighty-two patients had LVI and 50 patients had not. We found a relationship between Luminal B with Her2(-) and LVI, basal like and LVI (P = .00). No significant statistical difference was found between LVI and other molecular subtypes. We confirmed these results with multiple variable analysis (%77.3 correlation). CONCLUSIONS: As a result, we found that LVI can affect molecular subtypes. This showed that a histopathological factor may affect tumour biology. In other words, breast cancer is a heterogeneous disease with many different predictors and prognostic variables.