The stages of pancreatic cancer
Pancreatic cancer has four stages that describe the progression of the disease. In the early stages (I and II) the tumor is still resectable by surgical procedure, because the disease has not spread or has only spread into nearby tissue. At later stages, the cancer has spread into nearby blood vessels and lymph nodes (stage III) or even distant organs such as the lungs or liver (stage IV). At these stages, surgical treatment is no longer possible.
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John Hopkins Medicine: https://www.hopkinsmedicine.org/healthlibrary/conditions/endocrinology/pancreatic_cancer_85,P00415
Mayo Clinic: https://www.mayoclinic.org/diseases-conditions/pancreatic-cancer/symptoms-causes/syc-20355421