title: [Plasma chromogranin-A (CgA)--a potential marker for diagnosis, monitoring and management of prostate cancer patients].
abstract: BACKGROUND
  Neuroendocrine differentiation of prostatic adenocarcinoma is a recognized phenomenon, which is believed to parallel tumor progression to hormone refractory state. Circulating CgA levels were shown to reflect neuroendocrine differentiation and were found to correlate with the stage and the state of hormone refractoriness. Hence, CgA may become a marker for diagnosis, monitoring and management of prostate cancer patients.
  
  
  METHODS
  CgA level was measured in plasma samples which were obtained from 40 patients with prostate cancer, using the ELISA kit (DAKO, Glostrup-Denmark). The normal range of CgA was 2-18, SD = 4. The normal threshold was hence set to 26 u/L calculated as upper normal level + 2SD. Additionally, serum levels of PSA, CEA, CA-125, CA-15.3 and CA-19.9 were measured at that time. Clinical data was collected from medical records.
  
  
  RESULTS
  Overall, CgA was elevated in 18 patients (45%) including 25% of the patients with organ confined disease, 52.9% with locally advanced disease, 71.4% of the patients with metastases, 75% of the patients with hormone refractory prostate cancer and 23.1% of patients with hormone sensitive disease (p = 0.009). Mean CgA and PSA levels among patients with elevated CgA was 100.2 u/L (27-717) and 301 ng/ml (4.5-1450) respectively. In comparison to 18.8 u/L (14-26) and 14.7 ng/ml (2.6-59.7) respectively, in patients with CgA within the normal range (p < 0.05). PSA at the time of CgA sampling did not differ among the two groups.
  
  
  CONCLUSIONS
  In this study high plasma CgA levels correlated with known poor prognostic factors including advanced and metastatic disease at the time of presentation, high pretreatment PSA levels and hormone refractoriness. CgA levels which reflect neuroendocrine differentiation of prostatic carcinoma may have a diagnostic, therapeutic and prognostic role in the management of prostate cancer patients.
authors.affiliation: Department of Urology, Meir Medical Center, Kfar Saba. Leibovitchi@clalit.org.il
authors.forename: Ilan
authors.initials: I
authors.lastname: Leibovitch
authors.forename: Yehonatan
authors.initials: Y
authors.lastname: Pinthus
authors.forename: Ben-Ami
authors.initials: BA
authors.lastname: Sella
authors.forename: Jacob
authors.initials: J
authors.lastname: Ramon
mesh_terms: D014408:Biomarkers, Tumor / Q000097:blood*; D053379:Chromogranin A; D002864:Chromogranins / Q000097:blood*; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D008297:Male; D009367:Neoplasm Staging; D011379:Prognosis; D017430:Prostate-Specific Antigen / Q000097:blood; D011471:Prostatic Neoplasms / Q000097:blood / Q000473:pathology / Q000628:therapy*; D012016:Reference Values
chemical_list: D014408:Biomarkers, Tumor; C506150:CHGA protein, human; D053379:Chromogranin A; D002864:Chromogranins; D017430:Prostate-Specific Antigen