Cancer cells

What is cancer?

Our bodies are made up of millions and millions of tiny building blocks, known as cells, which normally grow, divide into two new cells (make copies of themselves) and then die in an orderly controlled way. When something goes wrong with this system, the cells begin to grow and divide in an uncontrolled way, and after a time enough of these abnormal cells (cancer cells) are produced to form a cluster, lump or lesion. This is called a cancer or tumour.