Loss of tumour-specific ATM protein expression is an independent prognostic factor in early resected NSCLC
| Autor: | Don Morris, Mie Konno, Anthony M. Magliocco, Chris T. Williamson, Tyler Williamson, L. Petersen, D. Gwyn Bebb, Desiree Hao, Susan P. Lees-Miller, A. Elegbede, Alexander C. Klimowicz, Stephanie K. Petrillo, S. Otsuka |
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| Rok vydání: | 2017 |
| Předmět: |
Adult
Male 0301 basic medicine Oncology medicine.medical_specialty Pathology Lung Neoplasms DNA repair Ataxia Telangiectasia Mutated Proteins Kaplan-Meier Estimate medicine.disease_cause Disease-Free Survival 03 medical and health sciences 0302 clinical medicine Carcinoma Non-Small-Cell Lung Internal medicine Biomarkers Tumor medicine Humans Pathological non-small cell lung cancer Aged Proportional Hazards Models Tissue microarray Proportional hazards model business.industry Expression index Middle Aged Prognosis early stage 030104 developmental biology Apoptosis ATM 030220 oncology & carcinogenesis outcome Immunohistochemistry Female digital pathology business Carcinogenesis Research Paper |
| Zdroj: | Oncotarget |
| ISSN: | 1949-2553 |
| DOI: | 10.18632/oncotarget.16215 |
| Popis: | Ataxia-telangiectasia mutated (ATM) is critical in maintaining genomic integrity. In response to DNA double-strand breaks, ATM phosphorylates downstream proteins involved in cell-cycle checkpoint arrest, DNA repair, and apoptosis. Here we investigate the frequency, and influence of ATM deficiency on outcome, in early-resected non-small cell lung cancer (NSCLC). Tissue microarrays, containing 165 formalin-fixed, paraffin-embedded resected NSCLC tumours from patients diagnosed at the Tom Baker Cancer Centre, Calgary, Canada, between 2003 and 2006, were analyzed for ATM expression using quantitative fluorescence immunohistochemistry. Both malignant cell-specific ATM expression and the ratio of ATM expression within malignant tumour cells compared to that in the surrounding tumour stroma, defined as the ATM expression index (ATM-EI), were measured and correlated with clinical outcome. ATM loss was identified in 21.8% of patients, and was unaffected by clinical pathological variables. Patients with low ATM-EI tumours had worse survival outcomes compared to those with high ATM-EI (p < 0.01). This effect was pronounced in stage II/III patients, even after adjusting for other clinical co-variates (p < 0.001). Additionally, we provide evidence that ATM-deficient patients may derive greater benefit from guideline-recommended adjuvant chemotherapy following surgical resection. Taken together, these results indicate that ATM loss seems to be an early event in NSCLC carcinogenesis and is an independent prognostic factor associated with worse survival in stage II/III patients. |
| Databáze: | OpenAIRE |
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