title: [Expression and significance of PD-L1 in laryngocarcinoma].
abstract: OBJECTIVE
  To study the expression of ligand 1 of programmed death-1 (PD-L1) in human laryngocarcinoma tissues and peritumoral tissue and its potential significance to clinic.
  
  
  METHODS
  Immunohistochemistry and Western-blotting were performed to assess the expression of PD-L1 at protein level and the differences in 31 cases of laryngocarcinoma tissue and 24 cases of paraneoplastic tissue.
  
  
  RESULTS
  Expression of PD-L1 was significantly higher in poorly and moderately differentiated larynx squamous carcinoma than that in well differentiated larynx squamous carcinoma. The expression of PD-L1 in the former was mainly in blood vessels while rarely in cancer cells, and the blood vessel of the latter displayed weakly positive while partial cancer cells showed positive; and the expression of PD-L1 was significantly correlated with lymphatic metastasis. Expression of PD-L1 in paraneoplastic tissues was significantly lower than that in cancer tissues but positively correlated to the expression level in the cancer tissues.
  
  
  CONCLUSIONS
  PD-L1 may play a part in the development and/or metastasis of laryngocarcinoma, particularly in the bad differentiated; And it maybe a new target of immunotherapy for laryngocarcinoma, especially for the poorly and moderately differentiated.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
authors.forename: Pingping
authors.initials: P
authors.lastname: Cao
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Cui
authors.forename: Zheng
authors.initials: Z
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
mesh_terms: D000368:Aged; D015703:Antigens, CD / Q000378:metabolism*; D060890:B7-H1 Antigen; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007822:Laryngeal Neoplasms / Q000378:metabolism / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis
chemical_list: D015703:Antigens, CD; D060890:B7-H1 Antigen; C423236:CD274 protein, human