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- W2415207380 abstract "In the last ten years considerable progress has been made in small-cell lung carcinoma (SCLC) biology, along with the technical progress made in molecular biology. This progress now allows us to propose a model for the genesis and the development of this type of tumor. Tobacco, the principal causal factor plays a dual role. In bringing about secretion of growth factors by the bronchial epithelia, usually involved in the normal development of lungs, and by functioning autocrinally and paracrinally, it facilitates the occurrence of mitotic mutations. Without directly contributing to cellular transformation, this autocrine functioning also gives a selective advantage to cells going through transformation or immortalization. The procarcinogenic or carcinogenic agents contained in tobacco smoke, whose level of production could be genetically determined, would also contribute to the accumulation of mutations affecting both suppressor genes and oncogenes. Two tumour suppressor genes have been identified: RB1 and P53. At least one other putative tumour suppressor gene has constantly been implied. It lies on the short arm of chromosome 3. There could also be the possibility of detecting subjects susceptible to developing an SCLC, a functional hemizygote still needing evaluation. The activated oncogenes principally belongs to the myc family. Their activation could correspond with the appearance of cellular clones having aggressive behavior independent of growth factors, chemoresistant and more metastatic. SCLC may be distinguished from other malignant lung tumors by a fairly characteristic pattern consisting of the loss of suppressor genes and the activation of oncogenes. The links between the neuroendocrine properties of this type of tumor and its characteristic description are being clarified and will contribute to a better understanding of the relationship between the different types of lung tumors. From this biologic knowledge follow several therapeutic applications under investigation (blocking autocrine loop through anti-GRP antibodies), as well as potential applications (concerning the products of suppressor genes) and possible applications such as prevention oriented towards detection of high-risk subjects." @default.
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- W2415207380 date "1992-01-01" @default.
- W2415207380 modified "2023-09-27" @default.
- W2415207380 title "[Biology of small-cell bronchogenic carcinoma: recent advances]." @default.
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