<Li> Nx: lymph nodes cannot be assessed </Li> <Li> N0: no regional lymph nodes metastasis </Li> <Li> N1: regional lymph node metastasis present; at some sites, tumour spread to closest or small number of regional lymph nodes </Li> <Li> N2: tumour spread to an extent between N1 and N3 (N2 is not used at all sites) </Li>

In the tnm classification (staging) system the 'm' stands for metastasis