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U.S. National Institutes of Health National Cancer Institute
Dictionary of Cancer Terms
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stage I colorectal cancer (...KOH-loh-REK-tul KAN-ser)

 Cancer has spread beyond the innermost lining of the colon and/or rectum to the second and third layers and involves the inside wall of the colon and/or rectum, but it has not spread to the outer wall or outside the colon and/or rectum. Also called Dukes A colorectal cancer.

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Colon cancer staging; shows tumors growing through layers of the colon wall for Stage 0, Stage I, Stage II, Stage III, and Stage IV colon cancer. Inset shows serosa, muscle, submucosa and mucosa layers of the colon wall, and lymph nodes and blood vessels.

Previous Definitions:stage I cervical cancer, stage I childhood Hodgkin lymphoma, stage I childhood liver cancer, stage I childhood non-Hodgkin lymphoma, stage I chronic lymphocytic leukemia
Next Definitions:stage I cutaneous T-cell lymphoma, stage I endometrial cancer, stage I esophageal cancer, stage I extrahepatic bile duct cancer, stage I gastric cancer