The staging of cancer often involves assessing the status of lymph nodes. The TNM staging system is commonly used, where "N" stands for nodes. The staging ranges from N0 to N3 and indicates the extent of lymph node involvement: - N0: No regional lymph node involvement. - N1: Limited regional lymph node involvement. - N2: Moderate regional lymph node involvement. - N3: Extensive regional lymph node involvement.
