title: Loss of myeloid-related proteins 8 and myeloid-related proteins 14 expression in human esophageal squamous cell carcinoma correlates with poor differentiation.
abstract: OBJECTIVE
  To study the expression of myeloid-related proteins(MRP)8 and myeloid-related proteins(MRP)14 in human esophageal squamous cell carcinoma and to investigate if there was any correlation between MRP8 and MRP14 expression level and histopathological grade in these tumors.
  
  
  METHODS
  In this study, 65 cases of advanced esophageal squamous cell carcinoma were assessed for MRP8 and MRP14 expression using immunohistochemistry. Statistical analysis was performed for the comparison of MRP8 and MRP14 expression in normal and tumor tissues, and their relationship with clinicopathological features.
  
  
  RESULTS
  Reduced or absent expression of MRP8 and MRP14 was observed in esophageal squamous cell carcinoma, with a significant difference between tumor tissues and normal tissues (P<0.01 and P<0.01 for MRP8 and MRP14, respectively). Poorly differentiated tumors presented a greater decrease than well and moderately differentiated tumors, with a correlation between their protein level and histopathological grading (P<0.001 and P<0.001, respectively). However, no significant association was found between MRP8 and MRP14 expression and age or gender (P>0.05).
  
  
  CONCLUSIONS
  These findings suggest that the decreased expression of MRP8 and MRP14 might play an important role in the pathogenesis of human esophageal squamous cell carcinoma, being particularly associated with poor differentiation of tumor cells.
authors.affiliation: National Laboratory of Molecular Oncology, Cancer Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Kong
authors.forename: Fang
authors.initials: F
authors.lastname: Ding
authors.forename: Chuan-Nong
authors.initials: CN
authors.lastname: Zhou
authors.forename: Xiu-Qin
authors.initials: XQ
authors.lastname: Wang
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Miao
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Liu
mesh_terms: D000328:Adult; D000368:Aged; D040501:Calgranulin A / Q000378:metabolism*; D040502:Calgranulin B / Q000378:metabolism*; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology; D002454:Cell Differentiation; D004938:Esophageal Neoplasms / Q000378:metabolism* / Q000473:pathology; D004947:Esophagus / Q000378:metabolism; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged
chemical_list: D040501:Calgranulin A; D040502:Calgranulin B