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Cell division is rapid and occurs for large number of times in
young and developing animals.
As a result the organism grows in size. As organism becomes an
adult, the cell division in several
tissues slows down. Some tissues may completely stop
dividing.
A tumour is large mass of cells formed due to uncontrolled
mitotic division of cells. When
these tumors are kept in enclosed in a layer of current tissue
and does not spread, such tumours are
called benign tomours. They are usually harmless and are removed
by surgery. Cells from tumoursspread to other parts of the body and
produce large no. of cells in other parts also. This type of
tumour is called malignant tumour. This condition is called
malignancy or cancer. In such conditions,
the person becomes weak looses appetite and may ultimately
die.
Researchers divide the causes of cancer into two groups: those
with a hereditary genetic
cause and those an environmental cause. Environmental in this
sense means all non-hereditary
factors, and encompasses far more thanenvironmental pollution.
About 5-10% of cancers are
directly due to hereditary genetic factors. The remaining 90-95%
of cases are due to environmental
factors, such as old age, lifestyle choices, tobacco use,
dietary choices,obesity,infections,radiation,
lack of physical activity, and environmental pollutants.[1]
Types of cancer :
Carcinoma: Cancer derived from epithelial cells. This group
includes many of the most
common cancers, including those of the breast, prostate,lung
andcolon.
Sarcoma: Cancer derived from connective tissue, or mesenchymal
cells.
Lymphoma andleukemia: Cancer derived from hematopoietic
(blood-forming) cells
Germ cell tumor: Cancer derived from pluripotent cells. In
adults these are most often found
in the testicle and ovary, but are more common in babies and
young children.
Blastoma: Cancer derived from immature "precursor" or embryonic
tissue. These are also
commonest in children.Cancers are usually named using
-carcinoma, -sarcoma or -blastoma as a suffix, with the Latin
or
Greek word for the organor tissue of origin as the root. For
example, a cancer of the liver is
calledhepatocarcinoma; a cancer of fat cells is called
aliposarcoma.
For some common cancers, the English organ name is used. For
example, the most common type
ofbreast cancer is called ductal carcinoma of the breast. Here,
the adjective ductal refers to the
appearance of the cancer under the microscope, which suggests
that it has originated in the milk
ducts.
An invasive ductal carcinomaof the breast(pale area at the
center) surrounded by spikes
of whitish scar tissue in the surroundingyellow fatty
tissue.
An invasivecolorectal
carcinoma (top center) inacolectomy specimen.
A squamous cellcarcinoma (the whitishtumor) near
A large invasiveductal
carcinomainamastectomyspecimen.
http://en.wikipedia.org/wiki/Hereditaryhttp://en.wikipedia.org/wiki/Environmental_pollutionhttp://en.wikipedia.org/wiki/Environmental_pollutionhttp://en.wikipedia.org/wiki/Tobaccohttp://en.wikipedia.org/wiki/Obesityhttp://en.wikipedia.org/wiki/Obesityhttp://en.wikipedia.org/wiki/Infectionshttp://en.wikipedia.org/wiki/Infectionshttp://en.wikipedia.org/wiki/Infectionshttp://en.wikipedia.org/wiki/Radiationhttp://en.wikipedia.org/wiki/Radiationhttp://en.wikipedia.org/wiki/Radiationhttp://en.wikipedia.org/wiki/Cancer#cite_note-Enviro2008-0http://en.wikipedia.org/wiki/Carcinomahttp://en.wikipedia.org/wiki/Epitheliumhttp://en.wikipedia.org/wiki/Breast_cancerhttp://en.wikipedia.org/wiki/Prostate_cancerhttp://en.wikipedia.org/wiki/Prostate_cancerhttp://en.wikipedia.org/wiki/Lung_cancerhttp://en.wikipedia.org/wiki/Colorectal_cancerhttp://en.wikipedia.org/wiki/Colorectal_cancerhttp://en.wikipedia.org/wiki/Sarcomahttp://en.wikipedia.org/wiki/Connective_tissuehttp://en.wikipedia.org/wiki/Mesenchymehttp://en.wikipedia.org/wiki/Lymphomahttp://en.wikipedia.org/wiki/Leukemiahttp://en.wikipedia.org/wiki/Leukemiahttp://en.wikipedia.org/wiki/Leukemiahttp://en.wikipedia.org/wiki/Bloodhttp://en.wikipedia.org/wiki/Germ_cell_tumorhttp://en.wikipedia.org/wiki/Pluripotenthttp://en.wikipedia.org/wiki/Testicular_cancerhttp://en.wikipedia.org/wiki/Ovarian_cancerhttp://en.wikipedia.org/wiki/Ovarian_cancerhttp://en.wikipedia.org/wiki/Blastomahttp://en.wikipedia.org/wiki/Organ_(anatomy)http://en.wikipedia.org/wiki/Organ_(anatomy)http://en.wikipedia.org/wiki/Hepatocarcinomahttp://en.wikipedia.org/wiki/Liposarcomahttp://en.wikipedia.org/wiki/Liposarcomahttp://en.wikipedia.org/wiki/Liposarcomahttp://en.wikipedia.org/wiki/Breast_cancerhttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Ductal_carcinomahttp://en.wikipedia.org/wiki/Ductal_carcinomahttp://en.wikipedia.org/wiki/Colorectal_carcinomahttp://en.wikipedia.org/wiki/Colorectal_carcinomahttp://en.wikipedia.org/wiki/Colorectal_carcinomahttp://en.wikipedia.org/wiki/Colectomyhttp://en.wikipedia.org/wiki/Squamous_cell_carcinomahttp://en.wikipedia.org/wiki/Squamous_cell_carcinomahttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Mastectomyhttp://en.wikipedia.org/wiki/Mastectomyhttp://en.wikipedia.org/wiki/Environmental_pollutionhttp://en.wikipedia.org/wiki/Tobaccohttp://en.wikipedia.org/wiki/Obesityhttp://en.wikipedia.org/wiki/Infectionshttp://en.wikipedia.org/wiki/Radiationhttp://en.wikipedia.org/wiki/Cancer#cite_note-Enviro2008-0http://en.wikipedia.org/wiki/Carcinomahttp://en.wikipedia.org/wiki/Epitheliumhttp://en.wikipedia.org/wiki/Breast_cancerhttp://en.wikipedia.org/wiki/Prostate_cancerhttp://en.wikipedia.org/wiki/Lung_cancerhttp://en.wikipedia.org/wiki/Colorectal_cancerhttp://en.wikipedia.org/wiki/Sarcomahttp://en.wikipedia.org/wiki/Connective_tissuehttp://en.wikipedia.org/wiki/Mesenchymehttp://en.wikipedia.org/wiki/Lymphomahttp://en.wikipedia.org/wiki/Leukemiahttp://en.wikipedia.org/wiki/Bloodhttp://en.wikipedia.org/wiki/Germ_cell_tumorhttp://en.wikipedia.org/wiki/Pluripotenthttp://en.wikipedia.org/wiki/Testicular_cancerhttp://en.wikipedia.org/wiki/Ovarian_cancerhttp://en.wikipedia.org/wiki/Blastomahttp://en.wikipedia.org/wiki/Organ_(anatomy)http://en.wikipedia.org/wiki/Hepatocarcinomahttp://en.wikipedia.org/wiki/Liposarcomahttp://en.wikipedia.org/wiki/Breast_cancerhttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Ductal_carcinomahttp://en.wikipedia.org/wiki/Colorectal_carcinomahttp://en.wikipedia.org/wiki/Colorectal_carcinomahttp://en.wikipedia.org/wiki/Colectomyhttp://en.wikipedia.org/wiki/Squamous_cell_carcinomahttp://en.wikipedia.org/wiki/Squamous_cell_carcinomahttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Mammary_ductal_carcinomahttp://en.wikipedia.org/wiki/Mastectomyhttp://en.wikipedia.org/wiki/Hereditary
