title: Adenosquamous carcinoma of maxillary sinus: case showing complete response to S-1.
abstract: BACKGROUND
  Adenosquamous carcinoma is a very rare tumour which is characterised pathologically by the simultaneous presence of distinct areas of adenocarcinoma and squamous cell carcinoma. Generally, adenosquamous carcinoma has an aggressive clinical course and is associated with a poor prognosis. Most cases have been treated by surgery alone or combined with radiotherapy. Chemotherapy is rarely used in treating adenosquamous carcinoma, and it has been difficult to establish treatment guidelines due to the paucity of cases.
  
  
  METHODS
  We report a case of adenosquamous carcinoma which arose in the maxillary sinus of a 77-year-old man. Despite surgical treatment and chemoradiotherapy to the primary site, he developed bilateral neck metastases after the surgery. The patient was treated with S-1, a novel oral fluoropyrimidine anticancer agent, with a complete (albeit finite) response.
  
  
  CONCLUSIONS
  This report presents the aggressive character of adenosquamous carcinoma and the possible role of S-1 in the treatment of this uncommon neoplasm.
authors.affiliation: Department of Otolaryngology and Head and Neck Surgery, Akita University School of Medicine, Akita, Japan. shinsukesx@hotmail.com
authors.forename: S
authors.initials: S
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Hanata
authors.forename: H
authors.initials: H
authors.lastname: Nanjo
authors.forename: K
authors.initials: K
authors.lastname: Ishikawa
mesh_terms: D000368:Aged; D000964:Antimetabolites, Antineoplastic / Q000627:therapeutic use*; D000971:Antineoplastic Combined Chemotherapy Protocols; D018196:Carcinoma, Adenosquamous / Q000175:diagnosis / Q000188:drug therapy* / Q000601:surgery; D004338:Drug Combinations; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D008444:Maxillary Sinus Neoplasms / Q000175:diagnosis / Q000188:drug therapy* / Q000601:surgery; D010094:Oxonic Acid / Q000627:therapeutic use*; D005641:Tegafur / Q000627:therapeutic use*; D014057:Tomography, X-Ray Computed
chemical_list: D000964:Antimetabolites, Antineoplastic; D004338:Drug Combinations; C079198:S 1 (combination); D005641:Tegafur; D010094:Oxonic Acid