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Colorectal cancer   is the most common cancer of all genders, with more than 40,000 new cases appearing each year and nearly 18,000 deaths. The 5-year survival rate tends to increase because treatments are constantly progressing, thanks to improved   surgery and chemotherapy . The choice of  treatment  depends on the  stage and location of cancer . It is never decided by a single professional but is the result of a multidisciplinary consultation meeting. The different stages of colorectal cancer Three criteria are used to determine the extent of  colorectal cancer : the size and depth of the  tumor , whether or not lymph nodes are involved and the number of lymph nodes affected, and whether or not there is metastasis. It is on these 3 criteria that the TNM classification (Tumor, Nodes, Metastasis) is based, which determines colorectal cancers in 5 stages of increasing extension/gravity, ranging from 0 to IV : Stage 0 : The tumor is said to be in situ, i.e. it is very superficial and th