72. What causes cancer?
Uncontrolled functioning and reproduction of body cells cause
cancer. When a cell turns cancerous or malignant, it does not work
properly and divides rapidly to produce more cells. A collection of
cancerous cells is called a tumor.
These cells are able to break away and are carried in the blood to
other parts of the body, where they continue to grow. The abnormal
cells increase manifold and interfere with normal body activity. If
untreated, they may cause very severe illness or death. The causes of
cancer are still not clear, but certain subtances like tar of cigarette
are known to change normal cells to cancer cells. It can be treated by
surgery, very powerful drugs or by radiation which damages the
affected cells, when detected in early stages.
Điều gì gây ung thư?
Sự hoạt động và sinh sản không kiểm soát được của các tế
bào cơ thể gây ra ung thư. Khi một tế bào trở nên nhiễm
ung thư hay ác tính, nó không hoạt động đúng là phân chia
