title: Cervical lymph node metastasis model of pyriform sinus carcinoma.
abstract: OBJECTIVE
  To establish a cervical lymph node metastasis model of pyriform sinus VX2 carcinoma and investigate its metastatic features.
  
  
  METHODS
  VX2 tumor tissue suspension was transplanted into the pyriform sinus submucosa of 15 rabbits under direct laryngoscopy. Rabbits were randomly placed into 1 of 3 groups, each comprised of 5 rabbits. Health evaluation and histopathological analysis were performed on days 14 (group 1), 21 (group 2), and 28 (group 3) after transplantation.
  
  
  RESULTS
  VX2 tumors were transplanted successfully in all rabbits. Dysphagia, weight loss, rhinorrhea, and dyspnea were observed 28 days after transplantation. Deep cervical lymph node metastasis occurred in all rabbits at all time points. The rate of submandibular lymph node metastasis was 60% in group 1, 80% in group 2, and 100% in group 3. The rate of paratracheal lymph node metastasis was 0% in group 1, 80% in group 2, and 100% in group 3.
  
  
  CONCLUSIONS
  A model of metastatic pyriform sinus carcinoma was established. This model could be used in future studies evaluating diagnostic and treatment methods.
authors.affiliation: Department of Otolaryngology, ZhongShan Hospital, Shanghai, China.
authors.forename: Na
authors.initials: N
authors.lastname: Shen
authors.forename: Haitao
authors.initials: H
authors.lastname: Wu
authors.forename: Xiuyin
authors.initials: X
authors.lastname: Xu
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Wang
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Hoffman
authors.forename: Adam L
authors.initials: AL
authors.lastname: Rieves
authors.forename: Liang
authors.initials: L
authors.lastname: Zhou