1McCashland TM,Brand R,Lyden E,et al.Gender differences in colorectal polyps and tumors[J]. Am J Gastroenterol,2001,96(3):882-886.
2Levin B,Smith RA,Feldman GE,et al.Primitig early detection tests for colorectal carcioma and adenomatous polyps :aframework for action:the strategic plan of the National Colorectal Cancer Roundtable[J] .Cancer, 2002,95(8):1618-1628.
3Morson BG.Genesis of colorectal cancer[J]. Clin Gastroenterol,1976,5(1):505-525.
4Arai T,Kino I . Role of apotosis in modulation of growth of human colotectal tubular and villous adenomas[J]. J Pathol,1995,176(3):37-44.