cancer

• what is a tumour? what causes a tumour to form?

  a tumour is a mass of cells. tumours are formed as a result of cellular changes which lead to uncontrolled cell growth and division.
• true or false? benign tumours are not cancerous

  true. only malignant tumours are cancerous
• Tarin has pancreatic cancer. a secondary tumour is found in his liver. what are secondary tumours. how did the secondary tumour form in the liver.

  secondary tumours are tumours that form when malignant tumour cells break off the original tumour and spread to other parts of the body. Malignant tumour cells broke off the tumour in his pancreas and spread to the liver in the blood to form a new tumour
• give three lifestyle risk factors for cancer

  smoking, obesity, UV exposure, viral infection
• martin has developed bowel cancer. martin's brother, Alan, has always led a very healthy lifestyle but is still at risk of developing bowel cancer. explain why this might be the case.

  some cancers have genetic risk factors. Martin may have inherited a faulty gene that made him more susceptible to bowel cancer. as he is Martin's brother, Alan may have also inherited this gene