title: HER2 expression in cervical cancer as a potential therapeutic target.
abstract: BACKGROUND
  Trastuzumab, a humanized monoclonal antibody against the HER2 receptor is currently being used in breast and other tumor types. Early studies have shown that a variable proportion of cervical carcinoma tumors overexpress the HER2 receptor as evaluated by diverse techniques and antibodies. Currently it is known that a tumor response to trastuzumab strongly correlates with the level of HER2 expression evaluated by the Hercep Test, thus, it seems desirable to evaluate the status of expression of this receptor using the FDA-approved Hercep Test and grading system to gain insight in the feasibility of using trastuzumab in cervical cancer patients.
  
  
  METHODS
  We analyzed a series of cervical cancer cell lines, the primary tumors of 35 cases of cervical cancer patients and four recurrent cases, with the Hercep Test in order to establish whether this tumor type overexpress HER2 at level of 2+/3+ as trastuzumab is currently approved for breast cancer having such level of expression.
  
  
  RESULTS
  The results indicate that only 1 out of 35 primary tumors cases overexpress the receptor at this level, however, two out of four recurrent tumors that tested negative at diagnosis shifted to Hercep Test 2+ and 3+ respectively.
  
  
  CONCLUSIONS
  The low frequency of expression in primary cases suggests that trastuzumab could have a limited value for the primary management of cervical cancer patients, however, the finding of "conversion" to Hercep Test 2+ and 3+ of recurrent tumors indicates the need to further evaluate the expression of HER2 in the metastatic and recurrent cases.
authors.affiliation: Unidad de Investigación Biomédica en Cáncer, Instituto Nacional de Cancerología-Instituto de Investigaciones Biomédicas, UNAM, Av, San Fernando No, 22, Tlalpan 14080, Mexico City, USA. celular_alma@hotmail.com
authors.forename: Alma
authors.initials: A
authors.lastname: Chavez-Blanco
authors.forename: Victor
authors.initials: V
authors.lastname: Perez-Sanchez
authors.forename: Aurora
authors.initials: A
authors.lastname: Gonzalez-Fierro
authors.forename: Teresa
authors.initials: T
authors.lastname: Vela-Chavez
authors.forename: Myrna
authors.initials: M
authors.lastname: Candelaria
authors.forename: Lucely
authors.initials: L
authors.lastname: Cetina
authors.forename: Silvia
authors.initials: S
authors.lastname: Vidal
authors.forename: Alfonso
authors.initials: A
authors.lastname: Dueñas-Gonzalez
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D061067:Antibodies, Monoclonal, Humanized; D018196:Carcinoma, Adenosquamous / Q000188:drug therapy / Q000235:genetics / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000235:genetics / Q000473:pathology; D045744:Cell Line, Tumor; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D017404:In Situ Hybridization, Fluorescence; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000188:drug therapy / Q000235:genetics; D009367:Neoplasm Staging; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism*; D000068878:Trastuzumab; D002583:Uterine Cervical Neoplasms / Q000188:drug therapy* / Q000235:genetics* / Q000473:pathology
chemical_list: D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D018719:Erb-b2 Receptor Tyrosine Kinases; D000068878:Trastuzumab