Human body consists of more than 60,000 billion cells. They are the units that form the tissues, which make our organs like liver, heart and lungs. Our body cells split into two and replace those that are defective. This process is controlled by nucleus, which contains chromosomes containing genes made of DNA.
Sometimes, these genes undergo change and the nucleus sends out abnormal order of cells. These abnormal cells multiply and take life of own. Each new cell produced contains same defect and proliferates chaotically and forms a tumor.
The tumor forms many blood vessels to survive. These will supply the tumor with oxygen, allowing it to live and grow. This is called as angiogenesis. The tumor poses risk only when the cancerous cells begin to invade through the vessels into the adjacent areas and spread through the surrounding organs.
These cells then spread across other parts of the body and multiply and produce new tumors. This process is termed as metastasis.
Why a cell becomes cancerous?
Factors that result in cancer include:
- Hereditary genetic anomalies
- HIV, Hepatitis B, C & D
- Epstein barr virus
- Exposure to toxic agents such as chemical products, Radiation & Sun
- Bad habits such as consumption of alcohol and tobacco
- Diet consisting of more fat
- Not consuming fruits and vegetables
Most common cancers
Today, more than 25 million people in the world live with cancer and seven million die from it.
- Lung cancer
- Breast cancer
There are many treatments to fight cancer and the ultimate goal of these treatments is to eliminate the tumor. There are three types of treatments: