Cancer is a very common illness.
There are more than 100 kinds of cancer.
Your body is made up of many kinds of cells.
To understand cancer, you need to know what happens when cells turn into cancer.
In a healthy person, cells grow normally.
Sometimes your body makes more cells than it needs.
These extra cells grow into something called a tumor.
There are two kinds of tumors.
One kind is called “benign.” That means it is not cancer.
The other kind is called “malignant.” Malignant tumors are cancer.
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