• rate of progression to prostate cancer at one year in men treated with Polyphenon E (200 mg EGCG bid) following diagnosis of HGPIN or ASAP. [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  
• safety of Polyphenon E (200 mg EGCG bid for one year) in men with HGPIN or ASAP [ Time Frame: 12 months ] [ Designated as safety issue: Yes ]
  
• the effect of Polyphenon E treatment on quality of life in men diagnosed with HGPIN or ASAP. Evaluate the effect of Polyphenon E treatment on LUTS and QOL in men diagnosed with HGPIN or ASAP. [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  

• the effect of Polyphenon E treatment on levels of ABCA5 in urine and PCADM-1 in serum [ Time Frame: 6 and 12 months ] [ Designated as safety issue: No ]
  
• Explore the effects of Polyphenon E on the fundamental molecular pathways contributing to chemopreventive activity of Polyphenon E in the prostate [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  

The proposed clinical study is a Phase II, randomized, double-blinded, placebo-controlled trial in men 30-80 years of age with biopsy proven HGPIN and no evidence of prostate cancer, prostatitis or urinary tract infection. A total of 272 men will be randomized to the study, with the goal of completing 240 evaluable subjects. Presence of HGPIN and absence of prostate cancer will be confirmed from a diagnostic biopsy with a minimum of 12 core biopsies. When possible, samples from the diagnostic biopsy will be used for baseline endpoint measurements (proteasome inhibition, Ki-67, apoptotic index, exploratory mechanistic studies) and for tissue banking (if a subject consents). Screening tests will also include a Demographic Questionnaire, physical exam, DRE, blood chemistry and hematology, PT/PTT, LDH, hepatic function panel and serum PSA. Subjects who consent to the study and meet initial eligibility criteria will be provided with a seven-day multivitamin/mineral supplement, and will undergo a one-week run-in period during which they will be asked to self-administer the supplement daily as well as complete study logs and two-day diet recall forms. Subjects must meet all inclusion criteria and remain compliant during the run-in period to be randomized to a treatment arm. At the baseline/randomization visit, a QOL (Medical Outcomes Study Short Form-36) and LUTS score assessment will be completed; urine and serum will be collected for measurement of diagnostic markers; plasma will be collected for measurement of baseline catechin levels; serum will be collected for banking; and diet recall forms will be collected. Subjects will be equally randomized (n=136 per arm) to blinded treatment with either Polyphenon E 200 mg EGCG bid or matching placebo, and an initial supply of study drug will be dispensed. All subjects will also be provided with a standard multivitamin/mineral supplement to assure consistent, appropriate nutrient intake among study participants. The planned intervention period is 12 months; subjects will return for monthly clinic visits during the intervention period. At each monthly clinic visit, blood will be drawn for repeat hepatic function panel, LDH and PT/PTT, and subjects will be interviewed to review and capture information from study agent intake log (pill count), assess signs and symptoms and concomitant medications; additional study medication will be dispensed as needed. After three and six months of intervention, blood will be drawn for serum chemistry and hematology, and LUTS and QOL assessments will be performed. In addition, at the six month visit, two-day diet recall forms will be collected, blood will be drawn for plasma catechin measurements and serum banking, serum and urine will be collected for diagnostic marker measurement, and repeat DRE and PSA will be performed. If there is a palpable prostate nodule or confirmed PSA increase (>0.75 ng/ml) at six months, a repeat biopsy will be performed. If the six-month biopsy shows evidence of disease progression, subjects will stop intervention and proceed to the post-intervention assessment; otherwise, intervention will continue through month 12. At the end of intervention (maximum of 12 months), a repeat prostate biopsy will be performed for post-intervention endpoint measurements. In addition, the physical exam and DRE, LUTS and QOL will be repeated, and two-day diet recall forms will be collected. Blood will be drawn for serum chemistry and hematology, PSA, hepatic function panel, LDH, PT/PTT; serum and urine will be collected for diagnostic marker measurement; plasma will be collected for catechin measurements; and serum will be collected for banking. Subjects will be interviewed to review and capture information from study agent intake log (pill count), assess signs and symptoms and concomitant medications. The primary endpoint of the study is a comparison of the incidence of prostate cancer between subjects in the treatment vs. placebo arm; in addition, the prevalence of HGPIN in pre-treatment and post-treatment biopsies in subjects treated with Polyphenon E vs. placebo will be compared. If subjects develop prostate cancer during the course of the study, the extent and grade of cancer will be assessed and compared between treatment groups. Other endpoints include: assessing the safety of Polyphenon E under the proposed dosing regimen; investigating the effect of Polyphenon E treatment on proteasome activity (chymotrypsin-like activity, IκBα protein expression, accumulation of p27 proteins, NFκB binding activity), cell proliferation (Ki-67) and apoptosis (TUNEL) in prostate tissue biopsy samples; correlating changes in proteasome activity with proliferation and apoptosis; evaluating the potential of ABCA5 level in urine and PCADM-1 level in serum as markers of HGPIN and prostate cancer, respectively; and evaluating effects of Polyphenon E on these putative diagnostic markers. Additional exploratory endpoints include treatment-related stabilization and accumulation of tumor suppressor p53 and pro-apoptotic protein Bax, inhibition of VEGF, MMP-2 and MMP-9. It is anticipated that approximately 40 months will be required to enroll all subjects; the entire study is expected to take 60 months to complete.