Essential TNM, a simplified staging system for cancer registries, is a complement to the full Tumour, Node, Metastasis (TNM) classification, to assign cancer stage at diagnosis. It is for use by cancer registrars when either the traditional (or full) TNM stage group (I, II, III, or IV) or the TNM staging components (T, N, and M) have not been explicitly recorded in the patient’s record.
