title: Expression of c-kit proto-oncogene product in breast cancer tissues.
abstract: BACKGROUND
  The published results on expression of c-kit in benign and malignant breast tissues vary.
  
  
  METHODS
  The immunohistochemical expression of c-kit proto-oncogene product in 52 invasive breast cancer tissues and 16 benign breast tumor (fibroadenoma) tissues was studied using anti-c-kit proto-oncogene product antibody. Its expression was evaluated by immunoreactive score (IRS).
  
  
  RESULTS
  In breast cancer tissues, the mean IRS of c-kit proto-oncogene product expression was significantly increased compared to those of fibroadenoma (3.4 +/- 2 and 2.19 +/- 1.8, respectively,p = 0.035). The mean IRS of c-kit expression was higher in the group comprising estrogen (ER) positive tumor than in the group of ER negative (4.1 +/- 2.1 and 2.7 +/- 1.8, respectively,p = 0.012) but no statistically significant relationship was seen between the expression of c-kit proto-oncogene product and other clinicopathological parameters of breast cancer, including histologic type, tumor size, lymph node metastasis, distant metastasis, stage, progesterone receptor, c-erbB-2 expression, menopausal status and age of the patient (p > 0.05).
  
  
  CONCLUSIONS
  Our results show that a high level of c-kit expression occurs frequently in invasive breast cancer, and its expression is associated with ER but unrelated to other clinico-pathological variables.
authors.affiliation: Department of General Surgery and Surgical Oncology, Numune State Hospital, Konya, Turkey. aydaneroglu@hotmail.com
authors.forename: Aydan
authors.initials: A
authors.lastname: Eroğlu
authors.forename: Aliye
authors.initials: A
authors.lastname: Sari
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D005260:Female; D018226:Fibroadenoma / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D009367:Neoplasm Staging; D000090063:Proto-Oncogene Mas; D019009:Proto-Oncogene Proteins c-kit / Q000378:metabolism*
chemical_list: C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D019009:Proto-Oncogene Proteins c-kit