Abstract:

AIM: The triple negative breast cancer is a very aggressive type of breast cancer which constituting approximately 10-15% of all cases. Despite the administration of adjuvant chemotherapy, 5-year disease-free survival rates are lower than other types. Response to treatment may indicate patients' long-term outcome. Several studies are associated with pathological complete response , improved disease-free survival and overall survival . Residual disease after neoadjuvant chemotherapy shows the tumor resistance to treatment. The aim of this study is to explore the relationship between pathological complete response and tumor characteristics. MATERIAL AND METHOD: Data of 53 triple negative breast cancer patients who were operated at one center after neoadjuvant chemotherapy between 2015-2022 were retrospectively analyzed. The data analyzed with descriptive and inferential statistics using SPSS IBM version 25. RESULTS: In the evaluation of 53 patients between the ages of 28 and 81 (mean: 50.7), pathological complete response was obtained in 21 of the patients (39.6 %), while 32 (60.4 %) were found to have an incomplete response or no response. Absence of axillary lymph node metastasis before neoadjuvant chemotherapy, high Ki-67 proliferation index and absence of extracapsular invasion in metastatic LN were associated with pathological complete response; Other clinicopathologic parameters were found to have no effect on the results. DISCUSSION: Patients with a high Ki-67 proliferation index and no axillary involvement are more likely to have a pathological complete response after neoadjuvant chemotherapy. CONCLUSION: It can be predicted that the prognosis may be better in patients with high Ki-67 proliferastion index and no axillary involvement .

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