4.2.2.7 cancer

Question 1

How are tumours formed

Answer 1

when changes take place in genes or in damaged / abnormal cells when they should which leads to uncontrolled growth and repair

Question 2

What are benign tumours?

Answer 2

Growth of abnormal cells found in one area which are often contained in a membrane, they don’t invade other parts of the body so do not spread.

Question 3

What are malignant tumours?

Answer 3

These invade neighbouring tissues and move into the bloodstream. They are classed as a cancer. They create new secondary tumours elsewhere in the body.

Question 4

What are the risk factors for cancer ?

Answer 4

• genetically obtained (breast cancer eg)
  -lifestyle (lungs from smoking)
  -substances in the environment or body (radon is a radioactive gas which leads to uncontrolled cell division)