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Question : What are the causes of cancer? |
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Answer» Solution :Transformation of normal cell into cancerous neoplastic CELLS may be induced by physical, chemical and BIOLOGICAL factors or agents. Cancer causing agents are known as Carcinogens. Ionizing radiations like X-rays and gamma rays and non-ionizing radiations like UV CAUSE DNA damage leading to neoplastic transformation. The chemical carcinogens present in tobacco smoke have been identified as a major cause of lung cancer. Cancer causing viruses called oncogenic viruses have genes called VIRAL oncogenes. Several genes called cellular oncogenes or proto-oncogenes have been identified in normal cells which, when activated under certain conditions, could lead to oncogenic transformation of the cells. |
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