The NER proteins are differentially expressed in ever smokers and in never smokers with lung adenocarcinoma.
ABSTRACT The expression levels of excision repair cross-complementation group 1 (ERCC1), replication protein A (RPA) and xeroderma pigmentosum group F (XPF) nucleotide excision repair proteins may be important in the response to platin-based therapy in lung cancer patients. It is not known whether ERCC1, RPA and XPF expression levels differ between ever smokers (ES) and never smokers (NS).
ERCC1, RPA and XPF expression levels were immunohistochemically evaluated in 125 patients with resected lung adenocarcinoma (AC) and carefully reviewed smoking status.
ERCC1 was correlated with XPF (P = 0.001), but not with RPA (P = 0.11). In the univariate analysis, ERCC1 and XPF levels were higher in NS compared with ES (P = 0.004 and P = 0.003, respectively). In the multivariate analysis, the smoking status was predictive of the ERCC1 level [odds ratio (OR) 2.5, 95% confidence interval (CI) 1.03-6.2] after adjustment for variables linked to the smoking status, including age and the presence of bronchioloalveolar (BAC) features. The smoking status was also predictive of both RPA (OR 6.7, 95% CI 1.5-33.3) and XPF levels (OR 12.5, 95% CI 2.9-50) after adjusting for age, sex and BAC features.
In patients with resected lung AC, ERCC1, RPA and XPF expression levels are higher in NS compared with ES.
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ABSTRACT: The main problem for vector quantisation is the codebook generation. The LBG method solves it with an iterative approach. This algorithm needs a long training sequence and an initial approximation of the codebook. These problems may be overcome by using space filling curves, also called Peano's curves, which are mappings from the unitary interval (image point) to the unitary hypercube. By using this kind of mapping the generation of the codebook, is reduced to the computation of the one-dimensional (optimum) quantiser associated to the probability density function (pdf) of the image points on the Hilbert curve. The paper describes the way of applying these mappings: a new algorithm is derived, generating codebooks for vector quantisation, and experimental results on image coding are provided.Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.; 05/1986
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ABSTRACT: Oxidative stress appears to play an essential role as a secondary messenger in the normal regulation of a variety of physiological processes, such as apoptosis, survival, and proliferative signaling pathways. Oxidative stress also plays important roles in the pathogenesis of many diseases, including aging, degenerative disease, and cancer. Among cancers, lung cancer is the leading cause of cancer in the Western world. Lung cancer is the commonest fatal cancer whose risk is dependent on the number of cigarettes smoked per day as well as the number of years smoking, some components of cigarette smoke inducing oxidative stress by transmitting or generating oxidative stress. It can be subdivided into two broad categories, small cell lung cancer and non-small-cell lung cancer, the latter is the most common type. Distinct measures of primary and secondary prevention have been investigated to reduce the risk of morbidity and mortality caused by lung cancer. Among them, it seems that physical activity and nutrition have some beneficial effects. However, physical activity can have different influences on carcinogenesis, depending on energy supply, strength and frequency of exercise loads as well as the degree of exercise-mediated oxidative stress. Micronutrient supplementation seems to have a positive impact in lung surgery, particularly as an antioxidant, even if the role of micronutrients in lung cancer remains controversial. The purpose of this review is to examine lung cancer in relation to oxidative stress, physical activity, and nutrition.Lung cancer (Amsterdam, Netherlands) 09/2013; · 3.14 Impact Factor
Article: [ERCC1 and lung cancer].[Show abstract] [Hide abstract]
ABSTRACT: ERCC1 plays a critical role in the repair of lesions in DNA induced by cisplatin. It has been demonstrated that, in patients with resected NSCLC, those with ERCC1-negative tumours had greater benefit from adjuvant chemotherapy than patients with ERCC1-positive tumours. On the other hand, patients with ERCC1-positive tumours have a better prognosis. ERCC1 can be evaluated either by the level of protein expression on immunohistochemical analysis or by quantification of its mRNA expression. At present ERCC1 appears to be a promising biomarker for predicting the benefit of cisplatin based chemotherapy and its modulation could allow sensitisation of tumour cells to this drug. Its use in daily clinical practice requires a further stage of prospective validation studies which are already in progress in patients both with completely resected NSCL or metastatic disease.Revue des Maladies Respiratoires 04/2010; 27(4):387-94. · 0.50 Impact Factor