In the TNM staging of lung cancer, what does the N component signify?

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In the TNM staging of lung cancer, what does the N component signify?

In this staging system, the N category tells you about lymph node involvement. It measures whether the cancer has spread to regional lymph nodes, which is different from metastasis to distant organs (M) and from the primary tumor’s size or local invasion (T). For lung cancer, the N designation describes involvement of nearby lymph nodes such as hilar and mediastinal nodes, and the extent of that nodal spread informs prognosis and treatment decisions. For example, N0 means no regional lymph node metastasis, while higher N levels indicate increasing nodal involvement.

In this staging system, the N category tells you about lymph node involvement. It measures whether the cancer has spread to regional lymph nodes, which is different from metastasis to distant organs (M) and from the primary tumor’s size or local invasion (T). For lung cancer, the N designation describes involvement of nearby lymph nodes such as hilar and mediastinal nodes, and the extent of that nodal spread informs prognosis and treatment decisions. For example, N0 means no regional lymph node metastasis, while higher N levels indicate increasing nodal involvement.

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