Colon Cancer Stages
There are 5 stages: stage 0 (zero) and stages I through IV (1 through 4). The stage provides a common way of describing the cancer, so doctors can work together to plan the best treatments. Here are more details on each part of the TNM system for colorectal cancer:
Stage 1: Stage 1 colon cancer indicates the cancer has grown into the inner layer of the colon, called the mucosa, to the next layer of the colon, called the submucosa. It has not spread to the lymph nodes.
The most common staging system for colorectal cancer is the TNM system. For colorectal cancer there are 5 stages – stage 0 followed by stages 1 to 4. Often the stages 1 to 4 are written as the Roman numerals I, II, III and IV.