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• W2008045776 abstract "PTK7 as a potential prognostic and predictive marker of response to adjuvant chemotherapy in breast cancer patients, and resistance to anthracycline drugs Beyhan Ataseven,1,2 Angela Gunesch,2 Wolfgang Eiermann,3 Ronald E Kates,4 Bernhard Högel,5 Pjotr Knyazev,6 Axel Ullrich,6 Nadia Harbeck4 1Department of Gynecology and Gynecologic Oncology, Kliniken Essen-Mitte, Essen, Germany; 2Department of Gynecology and Obstetrics, Rotkreuzklinikum Munich, Munich, Germany; 3Department of Gynecology and Oncology, Interdisciplinary Oncology Center Munich, Munich, Germany; 4Breast Center, Department of Gynecology and Obstetrics, Ludwig-Maximilian-University Munich, Munich, Germany; 5Department of Pathology, Rotkreuzklinikum Munich, Munich, Germany; 6Department of Molecular Biology, Max-Planck-Institute of Biochemistry, Martinsried, Germany Abstract: Biomarkers predicting resistance to particular chemotherapy regimens could play a key role in optimally individualized treatment concepts. PTK7 (protein tyrosine kinase 7) belongs to the receptor tyrosine kinase family involved in several physiological, but also malignant, cell behaviors. Recent studies in acute myeloid leukemia have associated PTK7 expression with resistance to anthracycline therapy. PTK7 mRNA expression in primary tumor tissue (PTT) and corresponding lymph node tissue (LNT) were retrospectively measured in 117 patients with early breast cancer; PTK7 expression was available in 103 PTT and 108 LNT samples. Median age was 60 years (range, 27–87 years). At a median follow-up of 28.5 months, 6 deaths and 16 recurrences had occurred. PTK7 expression correlations with clinicopathological features were computed and PTK7 expression effects on patient outcome were analyzed in three cohorts defined by adjuvant treatment: anthracycline-based treatment, other chemotherapy regimens (including taxane or other substances), or no chemotherapy. Association of PTK7 expression with clinicopathological features was seen only for age in PTT and nodal stage in LNT. High LN PTK7 was associated with poorer disease-free survival (DFS) in the total population (3-year DFS: low [81.7%] versus high [70.4%]; P=0.016) and in patients without adjuvant chemotherapy (3-year DFS: low [91.7%] versus high [22.3%]; P<0.001), but not in patients receiving adjuvant chemotherapy (P=0.552). DFS stratified by PTK7 expression was compared in treatment cohorts: In patients with low LN PTK7 expression, neither chemotherapy cohort showed significantly better survival than the no-chemotherapy cohort. In patients with high LN PTK7 expression, those receiving chemotherapy, including substances other than anthracyclines, but not those receiving only anthracycline-based chemotherapy, showed significantly better DFS than those receiving no chemotherapy (P=0.001). Our results support earlier findings that PTK7 may be a prognostic and predictive marker associated with resistance to anthracycline-based chemotherapy. Further investigations are needed to validate these findings in breast cancer.Keywords: breast cancer, PTK7, protein tyrosine kinase 7, chemoresistance, prognostic factors, predictive factors" @default.
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• W2008045776 date "2014-10-01" @default.
• W2008045776 modified "2023-10-15" @default.
• W2008045776 title "PTK7 as a potential prognostic and predictive marker of response to adjuvant chemotherapy in breast cancer patients, and resistance to anthracycline drugs" @default.
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• W2008045776 doi "https://doi.org/10.2147/ott.s62676" @default.
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