What is cancer?

For many reasons cell division can become unregulated. This leads to the formation of a mass of cells called a tumour which cannot perform their normal function – they are said to be undifferentiated. In some cases, cells from a tumour can spread to other parts of the body and form tumours elsewhere. The group of diseases involving spreading of tumour cells are collectively called cancer. 

Answered by Rohin A. Biology tutor

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