title: Nerve growth factor receptor (NGFR): a potential marker for specific molecular subtypes of breast cancer.
abstract: OBJECTIVE
  Nerve growth factor receptor (NGFR) is a transmembrane receptor for the neurotrophin family. It acts either as tumour suppressor or oncogene depending on cellular context. Its role in breast cancers remained conflicting, possibly due to the heterogeneity of breast cancer subtypes.
  
  
  METHODS
  In this study, we have analysed NGFR expression in 602 cases of breast cancers by immunohistochemistry. Its expression was correlated with biomarker expression and different breast cancer subtypes.
  
  
  RESULTS
  NGFR expression was found to be positively correlated with basal markers, including Ki67, Cytokeratin (CK5/6), CK14, p63, c-kit and Epidermal growth factor receptor (EGFR) , but negatively with hormonal receptors. Among different molecular subtypes, it was negatively associated with luminal A, but positively with luminal B, and basal-like breast cancer BLBC subtypes. When comparing NGFR with other basal markers in BLBC, though less sensitive, its specificity was comparable to or better than other basal markers. For luminal B cancers, NGFR showed a high specificity which was also comparable to or better than the defining markers (estrogen receptor (ER), progesterone receptor (PR), Human epidermal growth receptor 2 (HER2) and Ki-67) for the subtype.
  
  
  CONCLUSIONS
  Overall, these findings suggested that NGFR expression could be indicative for the BLBCs or luminal B subtypes. It may represent a potential adjunct marker for these two subtypes.
authors.affiliation: Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, Hong Kong, Hong Kong.
authors.forename: Julia Y S
authors.initials: JY
authors.lastname: Tsang
authors.forename: Ken H Y
authors.initials: KH
authors.lastname: Wong
authors.forename: Michael W H
authors.initials: MW
authors.lastname: Lai
authors.forename: Maribel D
authors.initials: MD
authors.lastname: Lacambra
authors.forename: Chun-Wai
authors.initials: CW
authors.lastname: Ko
authors.forename: Siu Ki
authors.initials: SK
authors.lastname: Chan
authors.forename: Christopher C F
authors.initials: CC
authors.lastname: Lam
authors.forename: Alex M C
authors.initials: AM
authors.lastname: Yu
authors.forename: Puay-Hoon
authors.initials: PH
authors.lastname: Tan
authors.forename: Gary M
authors.initials: GM
authors.lastname: Tse
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis*; D001943:Breast Neoplasms / Q000737:chemistry* / Q000145:classification / Q000473:pathology; D002277:Carcinoma / Q000737:chemistry* / Q000145:classification / Q000473:pathology; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000032:analysis*; D011237:Predictive Value of Tests; D011379:Prognosis; D017475:Receptors, Nerve Growth Factor / Q000032:analysis*; D012680:Sensitivity and Specificity; D046888:Tissue Array Analysis; D055815:Young Adult
chemical_list: D014408:Biomarkers, Tumor; C484065:NGFR protein, human; D009419:Nerve Tissue Proteins; D017475:Receptors, Nerve Growth Factor