The tumor has grown beyond the muscular layers and cancer is found in 4 or more nearby lymph nodes, but not distant sites. Stage 4 colon cancer is classified into two categories, stage 4A and 4B: 4A stage. This stage indicates that cancer has spread to one distant site, such as the liver or lungs. 4B stage.
This is the earliest stage of colon cancer and means it hasn’t grown beyond the mucosa, or the innermost layer of the colon. 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.
After someone is diagnosed with colorectal doctors will try to figure out if it has spread, and if so, how far. This process is called staging. The stage of a cancer describes how much cancer is in the body.