<unk>  is an estimate of the amount of penetration of the<unk> .  It is performed for diagnostic and research purposes and to determine the optimal method of treatment.  Staging is based on the TNM classification system which depends on the extent of local invasion, the degree of lymph node involvement, and whether there is distant metastasis. The staging systems are called Duke's classification, TNM classification, and AJCC stage grouping.
Colorectal cancer staging
Pancreatic cancer staging
Acinic cell carcinoma staging
Vulvar cancer staging
Oral cancer staging
Colorectal cancer follow up
Breast cancer staging
Carcinoid syndrome staging