ABSTRACT
Neoplastic polyps (tubular adenomas, villous adenomas, and tubulovillous adenomas)
may progress to cancer. The polyp-cancer sequence is now well recognized. An accumulation
of mutations in proto-oncogenes and tumor suppressor genes occurs, causing normal
colonic epithelium to progress from dysplasia to adenoma and ultimately to carcinoma.
Genes in whom mutations may occur and lead to the progression from polyp to cancer
include adenomatous polyposis coli, Kirsten rat sarcoma virus, deleted in colon cancer,
SMAD4, and p53. Other mutations involved in colorectal carcinogenesis include mutated
in colon carcinoma, nm23-H1, CMYC gene, CSRC gene, and mismatch repair and microsatellite
instability.
KEYWORDS
Adenoma-carcinoma sequence - polyp-cancer sequence - polyp growth - colorectal cancer
- molecular genetics of colorectal cancer