5Cagir B, Nagy M W,Topham A, et al. Adenosquamous carcinoma of the colon, rectum, and anus : epidemioiogy, distribution, and survival characteristics[ J ]. Dis Colon Rectum, 1999,42:258 - 263.
6Frizelle F A, Hobday K S, Batts K P,et al. Adenosquamous and squamous carcinoma of the colon and upper rectum : a clinical and histopathologic study[J]. Dis Colon Rectum,2001,44:341 -346.
7Audeau A, Han H W, Johnston M J,et al. Does human papilloma virus have a role in squamous cell carcinoma of the colon and upper rectum? [ J ]. Eur J Surg Oncol,2002,28:657 - 660.
8Kong C S, Welton M L, Longacre T A. Role of human papillomavirus in squamous cell melaplasia-dysplasia-carcinoma of the rectum [J].Am J Surg Pathol,2007,31:919 -925.
9Sotlar K, Koveker G, Aepinus C,et al. Human papillomavirus type 16-associated primary squamous cell carcinoma of threetum [ J ]. Gastroenterology,2001,120:988 - 994.
10Anagnostopoulos G, Sakorafas G H, Kostopoulos P,et al. Squamous cell carcinoma of the rectum : a case report and review of the literature [ J ]. Eur J Cancer Care (Engl) ,2005,14:70 - 74.
