title: [Expression of retinoic acid receptor-beta mRNA and p16, p53, Ki67 proteins in esophageal carcinoma and its precursor lesions].
abstract: OBJECTIVE
  To study the expression of retinoic acid receptor-beta (RAR-beta) mRNA and p16, p53, Ki67 proteins in squamous-cell carcinoma of the esophagus and its precursor lesions in a high risk population.
  
  
  METHODS
  A total of 397 tissue specimens were collected from individuals with normal mucosa (NM, n = 25), mild dysplasia (MiD, n = 69), moderate dysplasia (MoD, n = 106), severe dysplasia (SD, n = 51), carcinoma in situ (CIS, n = 78), and squamous-cell carcinoma (SC, n = 68). Expression of RAR-beta mRNA was detected by in situ hybridization, and that of p16, p53 and Ki67 proteins by immunohistochemistry.
  
  
  RESULTS
  The frequencies of RAR-beta mRNA expression in NM, MiD, MoD, SD, CIS and SC were 96.0%, 89.9%, 67.9%, 68.6%, 62.8%, and 63.2%, respectively. The frequencies of p16 expression were 88.0%, 71.0%, 64.2%, 51.0%, 53.8% and 52.9%; those of p53 expression were 4.0%, 39.1%, 57.5%, 52.9%, 67.9% and 69.1%; those of Ki67 expression were 0, 40.6%, 61.3%, 58.8%, 59.0% and 75.0%, respectively.
  
  
  CONCLUSIONS
  There are no significant differences in four biomarkers expression between carcinoma of the esophagus and its precursor lesions.
authors.affiliation: Tumor Markers Detection Center, Cancer Institute (Hospital), Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Huang
authors.forename: Li-feng
authors.initials: LF
authors.lastname: Wang
authors.forename: Hai-mei
authors.initials: HM
authors.lastname: Tian
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Mo
authors.initials: M
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Qu
authors.forename: Wu-ru
authors.initials: WR
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
mesh_terms: D014408:Biomarkers, Tumor / Q000378:metabolism*; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000378:metabolism; D004938:Esophageal Neoplasms / Q000378:metabolism*; D004947:Esophagus / Q000378:metabolism; D006801:Humans; D019394:Ki-67 Antigen / Q000378:metabolism; D011230:Precancerous Conditions / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D018168:Receptors, Retinoic Acid / Q000096:biosynthesis* / Q000235:genetics; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D019941:Cyclin-Dependent Kinase Inhibitor p16; D019394:Ki-67 Antigen; D012333:RNA, Messenger; D018168:Receptors, Retinoic Acid; D016159:Tumor Suppressor Protein p53; C082925:retinoic acid receptor beta