Causes of Cancer
Generally cancer is caused by mutation or abnormal activation of cellular genes that control cell growth and cell mitosis.
The abnormal genes that cause cancer are called oncogenes. Only a minute fraction of the cells that mutate in the body even lead to cancer. The probability of mutations can be increased by the following factors:
EXPOSURE OF IONIZING RADIATIONS:
Like X-rays, gamma rays and even ultraviolet rays can produce ions in tissue cells. These ions are highly reactive and can rupture DNA strands thus causing many mutations.
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CHEMICAL SUBSTANCES:
Various chemical substances like aniline dye derivatives from chemical plants cause mutations. The chemical substances which cause mutation are called carcinogens. Carcinogens, present in cigarette smoke, cause about one quarter of all cancer deaths.
PHYSICAL IRRITANTS:
Physical irritants such as continued abrasion of the linings of the intestinal tract by some types of food produce damages to the tissues which lead to rapid replacement of the cells by mitosis which cause the mutation.
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HERIDITARY:
Most cancers require not one mutation but two or more mutations before cancer occur. Therefore after development of fewer additional mutations, a cancer begins to grow.
VIRUSES:
Certain types of viruses can cause some kinds of cancer, including leukemia. There are three major differences between cancer cell and normal cell. First the cancer cell does not respect usual cellular growth limits. Secondly they can wander and enter into blood stream. Thirdly cancer cells produce angiogenic factors that cause many new blood vessels to grow into the cancer cells thus supplying the nutrients required for cancer growth. Since the cancer cells demand all nutrition for their uncontrolled growth, the normal tissue cells suffer for nutrients and gradual dying of the tissue cells lead to death.
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redmail99 | Nov 11, 2009 | Reply
nive article, full information…very scientific…
svishnugopal | Nov 11, 2009 | Reply
excellent work shanthu, you know how much i love to read about health and medicine…very nice..
sunshine926 | Nov 11, 2009 | Reply
Great informative article with pics. I am getting a forbidden comment.
cutedrishti8 | Nov 11, 2009 | Reply
thanks for this helpful information
Lady Sunshine | Nov 11, 2009 | Reply
Interesting and scary, shantu.
Themax | Nov 11, 2009 | Reply
hi shantu.
goodness you are getting serious!!
very serious and well described article I must say !!
Thank you
Atanacio | Nov 11, 2009 | Reply
my this was a very strong effort good write my friend
Teves | Nov 11, 2009 | Reply
Nice info.
diamondpoet | Nov 11, 2009 | Reply
Great article thank you for that insight.
diamondpoet | Nov 11, 2009 | Reply
I really enjoyed, great article thank you for that insight.
Jane Benitez | Nov 11, 2009 | Reply
Thanks for a very detail and informative article on cancer and hope someday we find a cure.
Aleena | Nov 11, 2009 | Reply
Very informative, good article.
Radhika | Nov 11, 2009 | Reply
very well researched……..Thanks for updating my knowledge
Ruby Hawk | Nov 11, 2009 | Reply
Important information, it will be helpful to many.
Sharif Ishnin | Nov 11, 2009 | Reply
Detailed description. Very informative article. Thanks for sharing this.
Chris Stonecipher | Nov 12, 2009 | Reply
Lately it seems that everywhere I turn I am finding a close friend or love one that has some form of cancer. People claim that the older you get the more you notice it. Your article is well researched, informative and interesting. Thanks for sharing.
Blessings to you,
Chris
eudefotah | Nov 12, 2009 | Reply
Thank you for this great information about cancer
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ReggieLutz | Nov 12, 2009 | Reply
interesting – good choice of visuals
goindia | Nov 12, 2009 | Reply
Thanks for the information. keep the good work going on.
lillyrose | Nov 12, 2009 | Reply
that was a really useful article!
Christine Ramsay | Nov 12, 2009 | Reply
Thank you for this information. I have learnt such a lot from it.
Good work.
Christine
Jane Jane | Nov 12, 2009 | Reply
very informative but I guess heriditary should be hereditary?
giftarist | Nov 12, 2009 | Reply
Very helpful article..Thanks!
drelayaraja | Nov 12, 2009 | Reply
Good article.
Frances Lawrence | Nov 12, 2009 | Reply
A very informative article
papaleng | Nov 12, 2009 | Reply
a well-researched article that is very well presented.
chitragopi | Nov 12, 2009 | Reply
Thorough information on cancer.
cebuanaeyez | Nov 12, 2009 | Reply
Great information! Cancer unfortunately runs high in my family!
Eunice Tan | Nov 12, 2009 | Reply
Good informative article. Like it.
Wennie Estares | Nov 13, 2009 | Reply
Hi, shantu, very well said. tnxs.
LovelyWolf | Nov 13, 2009 | Reply
This article was very informative for me. Especially now when my mother was diagnosed with breast cancer putting myself more at risk. So yeah, I’m really on the look out for tips like this, thank you!
Mystify | Nov 19, 2009 | Reply
Very interesting and informative article! Great write!