title: AcSDKP: a new potential marker of malignancy of the thyroid gland.
abstract: OBJECTIVE
  The tetrapeptide Acetyl-Ser-Asp-Lys-Pro (AcSDKP) a physiologic inhibitor of stem-cell proliferation is also known for it's strong angiogenic activity. It has been shown that blood levels of this peptide are increased in some hematological malignancies. However, no data on the concentration of AcSDKP present in solid tumor tissue are available. The aim of our study was to measure tissue concentration of AcSDKP in benign and malignant lesions of the thyroid gland.
  
  
  METHODS
  We assessed AcSDKP level in thyroid tissue specimens using enzyme immunoassay kit. The specimens were taken intraoperatively from 20 patients (17 women and 3 men aged 21-68 years): 10 patients with benign nodular goiter and 10 patients with papillary carcinoma of the thyroid gland.
  
  
  RESULTS
  The obtained results show that tissue concentration of AcSDKP in malignant thyroid tumors is five times higher when compared to benign lessions.
  
  
  CONCLUSIONS
  We conclude that AcSDKP may play a role in the development of the thyroid gland lesions. However, the further investigations concerning the tetrapeptide concentration in other thyroid malignancies, toxic nodular, and Grave's goiter are required to conclude on the eventual use of AcSDKP as a marker of malignancy.
authors.affiliation: General and Endocrine Surgery Department, Medical University of Lodz, Lodz, Poland. rmk@toya.net.pl
authors.forename: Michal
authors.initials: M
authors.lastname: Kusinski
authors.forename: Joanna
authors.initials: J
authors.lastname: Wdzieczak-Bakala
authors.forename: Jian-Miao
authors.initials: JM
authors.lastname: Liu
authors.forename: Jerome
authors.initials: J
authors.lastname: Bignon
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Kuzdak
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002291:Carcinoma, Papillary / Q000175:diagnosis / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009842:Oligopeptides / Q000378:metabolism*; D013964:Thyroid Neoplasms / Q000175:diagnosis / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D009842:Oligopeptides; C058504:goralatide