The TNM system is a globally recognized method for classifying the extent of cancer spread. This system is used primarily in the staging of solid tumors, which helps in planning treatment, estimating prognosis, and conducting clinical research. The TNM system is based on three key components:
T (Tumor): Indicates the size and extent of the primary tumor. N (Node): Describes the absence or presence and extent of regional lymph node involvement. M (Metastasis): Refers to the presence of distant metastatic spread.
