title: AIM1 promoter hypermethylation as a predictor of decreased risk of recurrence following radical prostatectomy.
abstract: OBJECTIVE
  To evaluate the prognostic significance of six epigenetic biomarkers (AIM1, CDH1, KIF1A, MT1G, PAK3, and RBM6 promoter hypermethlation) in a homogeneous group of prostate cancer patients, following radical prostatectomy (RP).
  
  
  METHODS
  Biomarker analyses were performed retrospectively on tumors from 95 prostate cancer patients all with a Gleason score of 3 + 4 = 7 and a minimum follow-up period of 8 years. Using Quantitative Methylation Specific PCR (QMSP), we analyzed the promoter region of six genes in primary prostate tumor tissues. Time to any progression was the primary endpoint and development of metastatic disease and/or death from prostate cancer was a secondary endpoint. The association of clinicopathological and biomolecular risk factors to recurrence was performed using the Log-rank test and Cox proportional hazards model for multivariate analysis. To identify independent prognostic factors, a stepwise selection method was used.
  
  
  RESULTS
  At a median follow-up time of 10 years, 48 patients (50.5%) had evidence of recurrence: Biochemical/PSA relapse, metastases, or death from prostate cancer. In the final multivariate analysis for time to progression, the significant factors were: Older age, HR = 0.95 (95% CI: 0.91, 1.0) (P = 0.03), positive lymph nodes HR = 2.11 (95% CI: 1.05, 4.26) (P = 0.04), and decreased hypermethylation of AIM1 HR = 0.45 (95% CI: 0.2, 1.0) (P = 0.05).
  
  
  CONCLUSIONS
  Methylation status of AIM1 in the prostate cancer specimen may predict for time to recurrence in Gleason 3 + 4 = 7 patients undergoing prostatectomy. These results should be validated in a larger and unselected cohort.
authors: Department of Otolaryngology and Head & Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.
authors: Eli
authors: E
authors: Rosenbaum
authors: Shahnaz
authors: S
authors: Begum
authors: Mariana
authors: M
authors: Brait
authors: Marianna
authors: M
authors: Zahurak
authors: Leonel
authors: L
authors: Maldonado
authors: Leslie A
authors: LA
authors: Mangold
authors: Mario A
authors: MA
authors: Eisenberger
authors: Jonathan I
authors: JI
authors: Epstein
authors: Alan W
authors: AW
authors: Partin
authors: David
authors: D
authors: Sidransky
authors: Mohammad O
authors: MO
authors: Hoque
mesh_terms: D000368:Aged; D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism*; D003459:Crystallins / Q000235:genetics / Q000378:metabolism*; D019175:DNA Methylation; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000235:genetics* / Q000378:metabolism / Q000517:prevention & control*; D011237:Predictive Value of Tests; D011468:Prostatectomy; D011471:Prostatic Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D014408:Biomarkers, Tumor; C105445:CRYBG1 protein, human; D003459:Crystallins; D008565:Membrane Proteins