title: Clinicopathlogic and immunohistochemical characteristics of triple negative invasive lobular carcinoma.
abstract: OBJECTIVE
  Our study is performed to find out clinicopathlogic and immunohistochemical (IHC) characteristics of triple negative invasive lobular carcinoma (ILC), as has been demonstrated in their invasive ductal counterparts.
  
  
  METHODS
  Retrospective analysis of variable clinicopathlogic parameters and IHC stains for androgen receptor, estrogen receptor, progesterone receptor, p53, c-kit, galectin-3, cytokeratin 5 (CK5), CK5/6, vimentin, E-cadherin, epidermal growth factor receptor, and HER2 were performed in 117 cases of ILC.
  
  
  RESULTS
  Eight cases (6.8%) were triple negative carcinoma (TNC), which showed higher incidence of high histologic grade than non-TNC (p = 0.019). Galectin-3 was expressed with higher incidence in tumor cells of TNC (62.5%) than those of non-TNC (7.3%) (p = 0.000). In contrast, galectin-3 was expressed with higher incidence in stromal cells of non-TNC (53.2%) than those of TNC (12.5%) (p = 0.029). CK5 and CK5/6 were not expressed in all ILCs.
  
  
  CONCLUSIONS
  TNC in ILC showed distinct clinicopathologic and IHC characteristics such as higher histologic grade and increased expression of galectin-3, compared to non-TNC in ILC. TNC in ILC was less frequent and did not show CK5 and CK5/6 expression when compared to TNC in invasive ductal carcinoma.
authors.affiliation: Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Ja Seung
authors.initials: JS
authors.lastname: Koo
authors.forename: Woohee
authors.initials: W
authors.lastname: Jung
mesh_terms: D000328:Adult; D001943:Breast Neoplasms / Q000378:metabolism*; D015820:Cadherins / Q000378:metabolism; D018275:Carcinoma, Lobular / Q000378:metabolism*; D066246:ErbB Receptors / Q000378:metabolism; D005260:Female; D037502:Galectin 3 / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods*; D053555:Keratin-5 / Q000378:metabolism; D053553:Keratin-6 / Q000378:metabolism; D008875:Middle Aged; D019009:Proto-Oncogene Proteins c-kit / Q000378:metabolism; D011944:Receptors, Androgen; D011960:Receptors, Estrogen / Q000378:metabolism; D011980:Receptors, Progesterone / Q000378:metabolism; D014746:Vimentin / Q000378:metabolism
chemical_list: D015820:Cadherins; D037502:Galectin 3; D053555:Keratin-5; D053553:Keratin-6; D011944:Receptors, Androgen; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; D014746:Vimentin; D066246:ErbB Receptors; D019009:Proto-Oncogene Proteins c-kit