Cancer

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Term Paper Title	Cancer
# of Words	1222
# of Pages (250 words per page double spaced)	4.89

Cancer

I chose to do my report on cancer because it is a subject I want to
learn about and because it can probably fit 5 pages. My
bibliography is on the ending of the report, my teacher helped me
with it because I didnt know how to do it. Cancer is the name for
tumors that are malignant. Malignant tumors do not respond to
body mechanisms that limit growing. Malignant tumors show a not
normal cell structure the same functional specialized cells. Also
cancer cells growing in laboratory tissue culture do not stop
growing when they touch each other on a glass or other solid
surface but grow in masses several layers deep they are said to lack
contact inhibition.
     Loss of contact inhibition accounts for two other
characteristics of cancer cells invasiveness of surrounding tissues
and metastasis spreading via the lymph system or blood to other
tissues and organs. Cells are typically controlled by growth factors
competence factors that stimulate cells to enter the beginning phase
of cell replication and progression factors that insure completion of
the replication cycle. The unrestricted growth rates of cells are due
to the activation and lack of inhibition of oncogenes. They are
cancer causing genes.
     Cancer tissue that grows without limits competes with normal
tissue for nutrients kills the normal cells by nutritional deprivation.
Cancerous tissue also causes secondary effects with the symptoms
of a malignant growth caused by the pressure of the growing tumor
against surrounding tissue or the metastasis of cancer cells and
their invasion of other organs. Cancers are graded as to degree of
malignancy on a scale of one through four the distinction between
even benign and malignant neoplasms is obscure. All organs and
tissues are susceptible to cancer.
     A lot of human cancers may be caused or at least triggered by
various chemical agents. Alkylating agents are thought to have a
carcinogenic effect because they chemically alter the cell's nucleic
acids. Nitrites common additives in processed meat react with
amines in the stomach to form nitrosoamines which some
authorities believe may be carcinogenic to humans. Other
commonly occurring carcinogens are azo dyes, polycyclic
hydrocarbons, and urethane. Certain carcinogens present
occupational hazards. Asbestos particles once inhaled stay in the
lung and act as an irritant. In the asbestos and construction
industries workers have a high probability of developing a fatal
cancer of the chest lining or abdominal lining ...

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