الأربعاء، 2 نوفمبر 2011
What is Cancer
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What is Cancer
Cancer : out-of-control cell
growth
There are over 100 different types of cancer
each is
classified by the type of cell that is initially affected
Cancer harms the body when damaged cells divide uncontrollably to form
lumps or masses of tissue called tumors (except in the case of leukemia
where cancer prohibits normal blood
function by abnormal cell division in the blood stream). Tumors can grow
and interfere with the digestive, nervous, and circulatory systems, and
they can release hormones that alter body
function. Tumors that stay in one spot and demonstrate limited growth
are generally considered to be benign.
when two things occur lead to
More dangerous, or malignant, tumors
- a cancerous cell manages to move throughout the body using the blood or lymph systems, destroying healthy tissue (invasion)
- that cell manages to divide and grow, making new blood vessels to feed itself in a process called (angiogenesis)
When a tumor successfully spreads to other parts of the body and grows,
invading and destroying other healthy tissues, it is said to have
metastasized. This process itself is called
metastasis, and the result is a serious condition that is very difficult
to treat.
cancer claimed the lives of about 7.6 million people in the
world every year
This post was written by:mohammed hwait
mohammed hwait is a professional pediatric, political and egyptian. Follow him on Twitter
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