This essay has a total of 1189 words and 11 pages.
About a million americans will develop skin cancer this year. Skin cancer is
the most prevalent of all cancers, and it's increasingly on the rise. There are
millions of tiny cells that make up the human body. There are different kinds of
cells, but they all make new cells by a process that involves dividing in half. This
is how old cells are replaced with strong new cells. When a cells divides and
doesn't do the job that it was intended to do for the body, and then it continues
to divide and makes more of these "useless" cells, and these cells continue to
collect, it is called a tumor.
There are two types of tumors: benign and malignant. The cells in a benign
tumor can "crowd out" healthy cells, even though they can not spread to other,
and healthier, parts of the body (Ingraham 447). However, a malignant tumor is
cancer. A malignant tumor can also "crowd out " the healthy cells around it, but
in addition to thatt it can spread to other parts of the body and take over the
healthy cells in different areas of the body.
Skin cancer is a disease in which cancer cells are found in the outer layers of
skin. The skin has two main layers and several kinds of cells. The top layer is the
epidermis and it is the layer that is shed most frequently. The inner layer is
called the dermis and is thicker and contains blood vessels, nerves, hair follicles
and sweat glands (Seely Stephens Tate 145).
Cancer spreads by a group of cells or a single cell that breaks away from the
tumor and moves to other parts of the body. Once there, it'll divide and start
tumors, made of malignant cells, like the ones that mad up the first tumor
(Ingraham 447). When this happens it is called metastic cancer. Metastatic
cancer is defined as the transfer of disease from one part of the body to another,
as in certain types of cancer (Funk & Wagnalls Dictionary 408.) . With many
cancers, the usual first step in prevention is that the affected body part is
removed. However, since a persons skin cannot be removed, in its entirety, this
presents more of a problem to physicians.
Skin cancer is somewhat curable when diagnosed and treated early. And, its
somewhat preventable by avoiding sun and tanning bed exposure. Sunscreen is a
simple, easy, and convenient artificial defense against skin cancer.
There are three main types of skin cancer. Melanoma is the least common,
but most serious because this type is responsible for at least three fourths of the
skin cancer deaths per year (Encarta encyclopedia, cdrom). The other types of
skin cancer are basal cell and squamous cell cancers. These two are referred to as
"non-melanoma" skin cancers. Another rare type of skin cancer, known as
Kaposi's sarcoma, is rarely seen (Barnes-Savarney, 177).
The most common type of skin cancer is basal cell skin cancer. However,
Melonoma is the fastest growing type of cancer, affecting approximately 32,000
americans in 1993 (Encarta Encyclopedi, cdrom). Melanoma is triggered by
ultraviolet rays from the sun and is signaled by the growth or appearance of an
irregular mole on the skin. The mole may be diagnosed based on its size, shape,
color, or texture, or due to its tenderness or hardness.
Developing skin cancer is a two step process. It involves initiation and
promotion of malignant growth. Since the ultraviolet rays harm the mechanism
for repairing cell damage, one the repair system is impaired, cells become
increasingly vulnerable to injury. Subsequ
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