Cancer

• Tumour


  Uncontrolled cell division
• Types of tumour


  • Benign
  • Malignant
• Benign tumour


  • Growths of abnormal cells
  • Found in one area
  • Usually contained within a membrane
  • Do not invade other parts of body
  • Stay in one place, not classed as cancer
• Malignant tumour


  • Invade neighbouring tissues
  • Move into bloodstream
  • Classed as cancer
  • Spread to different parts of body and form new tumours (secondary tumours)
• Risk factors for cancer

  • Genetic-inherited increased risk
  • Lifestyle factors (smoking, ultraviolet light, alcohol)
  • Environmental factors (radon/radioactive gas)
• Radon/radioactive gas


  Increases risk of lung cancer
• Releases ionising radiation, damages DNA and causes cells to undergo uncontrolled cell division