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-What is Cancer ?
An adult grows to an average of 1015 cells from a single fertilized
egg. After humans reach maturity, the number of cells remains essentially
constant. However, even in adults, cell division continues approx.
at the rate of 1012 cells dying each day, which must be replaced.
In the adult the number of cells that are produced, equals the number
of cells that die. If the number of cells that are produced exceeds
the number of cells that die in a given period of time – there
is growth, and when this growth is uncontrolled, it is known as
Cancer.
The
association of Specific Chromosomal abnormalities with particular
types of human cancer has been established by investigators during
the past decade. Many of the Genes involved in consistent Chromosome
rearrangements, have already been identified. It has been established
that multiple genetic changes are usually required to transform
a normal cell into a fully malignant cell. Virtually all Malignant
tumours have an abnormal karyotype. The use of improved techniques
led to the identification of clonal abnormalities in at least 80%
to 90% of patients.
The exact cause of Cancer is not known till date, but because of
scientific researches some probable causes are found, namely:
- Tobacco
- using in any form.
- Using
Alcohol.
- Different
rays which are in the atmosphere namely Gamma Ray, Ultra Violet
ray etc.
- Due
to usage of different chemicals in our every day life like manures,
colouring agents in the food stuff etc.
- Due
to over exposure to sun rays skin Cancer can occur.
- Due
to some Viruses like HIV Virus, Hepatitis B Virus, Herpes Virus.
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