Question

causes of cancer/carcinogenic agents_??​

Answer 1

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causes of cancer/carcinogenic agents_??

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Causes of Cancer/Carcinogenic agents

Transformation of normal cells into cancerous, neoplastic cells may be induced by physical, chemical and biological agents.

Physical agents

lonising radiations like X-rays and gamma rays and non-ionizing radiations like UV rays cause DNA damage which leads to neoplastic transformation.

Chemical agents

Chemical carcinogens are present in tobacco smoke which have been identified as a major cause of lung cancer.

Biological agents

Cancer causing viruses called oncogenic viruses have genes called viral oncogenes which can cause cancer. Several genes called cellular oncogenes (c-onc) or protooncogenes have been identified in normal cell. Activation of these genes under certain conditions could lead to oncogenic/carcinogenic transformation of the cells.