The frequency and clinical significance of DNA polymerase beta (POLβ) expression in breast ductal carcinoma in situ (DCIS).

Autor: Al-Kawaz A; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK.; Department of Pathology, College of Dentistry, Al Mustansiriya University, Baghdad, Iraq., Ali R; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK., Toss MS; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK., Miligy IM; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK.; Department of Pathology, Faculty of Medicine, Menoufia University, Menoufia, Egypt., Mohammed OJ; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK., Green AR; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK., Madhusudan S; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK., Rakha EA; Division of Cancer and Stem Cells, School of Medicine, The University of Nottingham, Nottingham, UK. emad.rakha@nottingham.ac.uk.; Department of Pathology, Faculty of Medicine, Menoufia University, Menoufia, Egypt. emad.rakha@nottingham.ac.uk.; Department of Histopathology, Nottingham University Hospital NHS Trust, City Hospital Campus, Hucknall Road, Nottingham, NG5 1PB, UK. emad.rakha@nottingham.ac.uk.
Jazyk: angličtina
Zdroj: Breast cancer research and treatment [Breast Cancer Res Treat] 2021 Nov; Vol. 190 (1), pp. 39-51. Date of Electronic Publication: 2021 Aug 18.
DOI: 10.1007/s10549-021-06357-7
Abstrakt: Background: The prediction of clinical behaviour of breast ductal carcinoma in situ (DCIS) and its progression to invasive disease remains a challenge. Alterations of DNA damage repair mechanisms are associated with invasive breast cancer (BC). This study aims to assess the role of base excision repair (BER) DNA Polymerase Beta (POLβ) in DCIS.
Methods: A cohort of DCIS comprising pure DCIS (n = 776) and DCIS coexisting with invasive BC (n = 239) were prepared as tissue microarrays. POLβ protein expression was assessed using immunohistochemistry and correlated with clinicopathological parameters and patient outcome. Preclinically, we investigated the impact of POLβ depletion on stem cell markers in representative DCIS cell line models.
Results: Reduced POLβ expression was associated with aggressive DCIS features including high nuclear grade, comedo necrosis, larger tumour size, hormonal receptor negativity, HER2 overexpression and high Ki67 index. Combined low nuclear/low cytoplasmic POLβ expression showed the strongest association with the features' characteristics of aggressive behaviour. There was a gradual reduction in the POLβ expression from normal breast tissue, to DCIS, with the lowest expression observed in the invasive BC. Low POLβ expression was an independent predictor of recurrence in DCIS patients treated with breast conserving surgery (BCS). POLβ knockdown was associated with a significant increase in cell stemness markers including SOX2, NANOG and OCT4 levels in MCF10-DCIS cell lines.
Conclusion: Loss of POLβ in DCIS is associated with aggressive behaviour and it can predict recurrence. POLβ expression in DCIS provides an additional feature for patients' risk stratification for personalised therapy.
(© 2021. Crown.)
Databáze: MEDLINE
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