Typically these cancer stages are five, with the progression of zero to four denoting the cancer’s advance. Stage zero denotes that the cancer is “in place”, that is, confined to the place it originated from. This is the best time to tackle the cancer and the patient tends to respond well to treatment. Stage 1 (also known as Early Stage Cancer) simply means that the cancer has not grown deeply into nearby tissues and has not spread to other parts of the body. ‘Localised Cancer’ best describes the cancer at this stage.
Stages 2 and 3 indicate that the cancer has established itself into nearby tissues, and quite possibly into the lymph nodes, although aggressive metastasis has not taken place. We may label the cancer at this stage as ’Regional Spread’. Metastasis refers to the development of secondary malignant growths often far removed from the primary site of the Cancer in question.
Stage 4 Cancer, by logical progression, is cancer that has advanced and spread to other parts or organs of the human body. Cancer at this stage is also known as Metastatic Cancer or Advanced Cancer. The TNM (Tumour, Node, and Metastasis) system of Cancer Staging is widely used. Annotated with numbers (N3, for example) this system determines the size and possibility of the spread of the cancer, whether the cancer has spread to the lymph nodes, and also indicates the level of advancement (or otherwise) of the cancer in the body. N3 for instance would mean a lot of lymph nodes contain cancer cells. Blood Cancers by their very nature (non-tumour forming) are outside the scope of the TNM system. These cancers (Leukemia, Lymphoma and Myeloma) have their own grading systems.