1. Do all colorectal carcinomas arise in preexisting adenomas?;Jass;World J Surg,1989
2. Adenoma screening and colorectal cancer: the need for screening and polypectomy is unproved;Pollock;BMJ,1992
3. Screening sigmoidoscopy for colorectal cancer;Levin;N Engl J Med,1992
4. Neoplastic transformation of a human colonic epithelial cell line: in vitro evidence for the adenoma to carcinoma sequence;Williams;Cancer Res,1990
5. Differential sensitivity of human colonic adenoma and carcinoma cells to transforming growth factor β (TGF-β): conversion of an adenoma cell line to a tumorigenic phenotype is accompanied by a reduced response to the inhibitory effects of TGF-&bgr;Manning;Oncogene,1991