Validation of the pathological classification of lymph node metastasis for head and neck tumors according to the 8th edition of the TNM Classification of Malignant Tumors

One of the main objectives of a staging system, as stated in the introduction of the 8th edition of the TNM Classification of Malignant Tumours [1] (8th ed. TNM), is to provide prognostic information. With this aim, every new edition of the TNM incorporates modifications that improve the prognostic capacities of the classification.

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