a way/system to classify or label the stage of cancer in the body. It measures 3 major areas of the cancer. Every cancer is different and how they are measured and labelled by the TNM system will vary T stands for tumour and the number given to the T (from 1 to 4), tells the size and thickness of the primary tumour and if it is growing. The higher the number, such as T4, the further the cancer has spread N stands for nodes and the N number (from 1 to 3) tells how many lymph nodes or which lymph nodes the cancer has spread to. The higher the number, the more nodes the cancer has spread to, for example N2 means more than one lymph node, near the primary tumour, has been attacked by cancer M stands for metastasis, the M number (either 0 or 1) describes if, and how far the cancer has grown. For example M0 means there is no sign of cancer spreading to other parts of the body but M1 means the cancer has spread to other areas The 3 areas are measured and put together to show how far a cancer has grown and this is used to give it a stage number (see staging)