Cell Division on overdrive Sometimes cell division gets out of hand. A mass of cells continue to divide without any benefit to the body. A lump of cells is formed- a Tumour
Benign Tumour A benign tumor does not affect the cells around it. The surrounding cells maybe crowded and squished, but they continue performing their functions.
Malignant Tumour It interferes with the work of the cells around it. May destroy the cells around it. Some malignant tumour cells can break away and travel to other parts of body.
Cancer and its Causes Cancer is a group of diseases that leads to uncontrolled cell division and the formation of a cell lump, a malignant tumour (a malignant tumour cell is said to be cancerous) Carcinogens- Environmental factors that cause cancer – Tobacco smoke – X-rays (repeated exposure) – Environmental pollution – UV radiation (sunlight or tanning beds) – Some organic solvents – Some chemicals (eg. Bi sphenol A -BPA- in plastic bottles)
Cancer by heredity – The DNA passed from one generation to the next may be damaged. Cancer by mutation – random changes in DNA.
Detection and Diagnosis Moles: Indicators of Skin Cancer
Detection and Diagnosis X-Rays: can detect cancer in bone, muscles and some organs.
Detection and Diagnosis Mammograms: a type of X-Ray used for breast cancer detection, and regular screening.
Detection and diagnosis Biopsy- A small portion of a suspected tumour is surgically removed, and the cells are compared to normal cells. Differences in size and shape are used to determine if the cells removed are cancerous.