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- W2947501732 abstract "e14655 Background: Neoadjuvant chemotherapy (NAС) is one of the treatment options for breast cancer (BC). However, chemotherapy is known can cause intratumoral changes that increase the risk of metastasis. We have previously found that the appearance of new amplifications in the chromosomal regions harboring stemness genes (3q, 5p, 6p, 7q, 8q, 9p, 9q, 10p, 10q21.1, 13q, 16p, 18Chr, 19p) is associated with the development of hematogenous metastases in 100% of cases. In our study, we evaluated the prognostic significance of amplifications stemness genes in primary BC depending on the NAC response. Methods: The study included 104 patients with stage II-III luminal B (Her2Neu -) breast cancer. All patients received 4-8 courses of NAС followed by surgery and hormone therapy. The follow-up period was 4-10 years. Amplifications in primary tumor DNA were determined using Affymetrix high density microarrays. Metastasis-free survival was estimated using the Kaplan-Meier method. Results: Zero or only 1 amplification was identified in tumor tissue of 42 patients (41%) (group 1). Two or more amplifications were identified in tumor tissue of 60 patients (59%) (group 2). We evaluated metastasis-free survival separately in each group, depending on the NAС response. It was found that in group 1, the median survival time was 122 months in cases with partial or complete regression (PR + pCR, and 63 months in cases with stable disease or disease progression (S + P), p > 0.05. In group 2, the median survival of patients with PR + pCR was not reached, and it was 63 months in patients with S + P, p = 0.025. Conclusions: Achievement of partial or complete regression in breast cancer patients, whose primary tumors displayed 2 or more amplifications of stemness genes, was associated with the increased rates of metastasis-free survival and can be considered as a positive prognostic criterion. However, the response to NAC did not impact survival of patients with 0-1 amplification of stemness genes." @default.
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- W2947501732 date "2019-05-20" @default.
- W2947501732 modified "2023-09-26" @default.
- W2947501732 title "Prognostic significance of amplifications of stemness genes in primary luminal breast cancer depending on the response to neoadjuvant chemotherapy." @default.
- W2947501732 doi "https://doi.org/10.1200/jco.2019.37.15_suppl.e14655" @default.
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