What is cancer?
All living things - ourselves included - are made up of cells. Cells are microscopic packages of living material and we have billions of them. They come in many different types: liver cells, brain cells, blood cells and so on. In the normal adultS, cells only grow and divide slowly and under very tight control to make sure that the number of cells in each tissue stays the same. Cancer begins when one cell changes and starts growing and dividing rapidly and out of control. This one cells divides to give two cells, then four, eight and so on until they form growing mass of cancer cells - called a tumor.