How do normal cells get transformed into cancerous neoplastic cells? M

How do normal cells get transformed into cancerous neoplastic cells? Mention the differences between viral oncogenes and cellular oncogenes.

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The transformation of normal cells into cancerous neoplastic cells is induced by physical, chemical and biological agents collectively called carcinogens; they lose the property of contact inhibition.

Viral Oncogenes	Cellular Oncogenes
These are the genes present in the oncogenic viruses, which effect oncogenic transformation of the cells they infect.	These are the genes present in normal cells and code for growth factors; when activated under certain conditions, can cause oncogenic transformation of the cell.

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How do normal cells get transformed into cancerous neoplastic cells? Mention the differences between viral oncogenes and cellular oncogenes.

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