Cancer

Cancer
Definition
A process of uncontrolled cell division, cells divide rapidly and abnormally and caused cancer.
Types of Cancer
There are two types of cancer.
1. Malignant
2. Benign
1. Malignant
A tumor can invade adjacent tissues and destroy them. Such tumors are called malignant.
2. Benign
A tumor is said to be benign if it does not attack the other tissues.
Causes of Cancer
The main causes of cancer are
1. Mutation
2. Hereditary
3. Virus
1. Mutation
The cancer is caused by mutation of cellular gene that control cell growth and cell division.
The mutation in cellular gene may be due to the X-rays, Gamma Rays and radiation from radioactive substance.
2. Hereditary
There may be a hereditary tendency for cancer.
3. Virus
In animals so many viruses can cause some kinds of caealike leukamia. In this case DNA of virus is inserted directly in chromosome and caused gene mutation.
Cancer Cell kills Other Cells
Cancer cells multiply their number day by day and required all essential nutrients available in the body due to which normal tissues suffer regularly and after some time they become dead.