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Answer the following with respect to Can...

Answer the following with respect to Cancer.
(a) How does a cancerous cell differ from a normal cell?
(b) Bengin tumor is less dangerous than maligant tumor. Why?
© Describe causes of cancer.
(d) Mention two methods of treatment of the disease.

Text Solution

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(a) In normal cells, growth and differnatiation is highly controlled and regulated (contact inhibition). The cancerous cells have lost the property of contact inhibition, hence continue to divide giving rise to masses of cells (tumors).
(b) The bengin tumor remains confined in the organ affected as it is enclosed in a connective tissue sheath and does not enter the metastatic stage.
(c) Cancer may be caused dute to carcinogens which are physical (X-rays, gamma rays and UV rays), chemicals (Nicotine, Aflatoxin, Cadmium oxide,Asbestos) and biological (viral oncogens and proto oncogens).
(d) Surgery, radiotherapy, Chemotherapy, immunotherapy by using biological response modifiers like `alpha`-interferons.
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