Like other genes, the genes regulating cell divisions are subjected to mutation. This may either stop the division or result in a rapid and uncontrolled division. Cancer is the cumulative effect of several abnormalities resulted from rapid and uncontrolled division of a particular type of cells.
Tumour is the formation resulted from abnormal growth and division of Neoplastic cells. Tumours are of two types: (1) Benign Tumours, (2) Malignant Tumours often result in Metastasys which is cancerous.