DNA ploidy and p53 expression associated with tumor site and lymph node metastasis in colorectal cancer

Objective: To study the association of DNA ploidy abnormality and p53 overexpression with the carcinogenesis of colorectal cancer. Methods: DNA ploidy and p53 expression were measured in a series of 42 colorectal adenocarcinomas by means of flow cytometry and immunohistochemical test. Results: 17 tumors (40%) were diploid and 25 (60%) aneuploid. The aneuploid tumors were significantly more common in the distal colon than in the proximal colon (P