1. Adenocarcinomas of the anal canal and peri-anal tissues;Cabrera;Ann. Surg.,1966
2. Malignant tumors of the anus. a study of 106 cases;Merlini;Am. J. Surg.,1985
3. Perianal mucinous adenocarcinoma and fistula-in-ano;Abramson;Mil. Med.,1986
4. International Classification of Diseases for Oncology;WHO,2000
5. Perianal adenocarcinoma associated with anal fistula: a report of 11 cases in a single institution focusing on treatment and literature review;Hongo;Hepatogastroenterology,2013