A resource with animated graphics on the cellular mechanisms causing cancer, diagnosis and treatment. Cancer cells can replicate by overcoming the normal controls of cell division. They may form a lump or tumour which can cause damage to surrounding tissues and organs. Cancer cells may spread from the original (primary) tumour to form new (secondary) tumours throughout the body. When this happens, the tumour is said to have metastasized. This resource looks at how cancer cells develop, the causes of cancer and how treatments are used to tackle cancer.