TNM system for bone cancer
The staging guidelines developed by the American Joint Committee on Cancer (AJCC) are often used to stage bone cancers, and allow doctors to communicate important information about the cancer with each other in a standardized way. Bone cancer stages are based on four categories:
- T - Describes the size of the primary bone tumor.
- N - Indicates whether the bone cancer cells have spread to regional lymph nodes.
- M - Refers to whether the cancer has metastasized (spread to distant areas of the body).
- G - Grade refers to how abnormal the tumor cells look under the microscope (high-grade tumors look more abnormal, grow more quickly and are more likely to spread).