Pomegranate-Extract Pill in Preventing Tumor Growth in Patients With Localized Prostate Cancer Undergoing Active Surveillance

Phase 2CompletedNCT02095145

National Cancer Institute (NCI)38 enrolled

Overview

This randomized phase II trial studies pomegranate-extract pill in preventing tumor growth in patients with prostate cancer that is limited to a certain part of the body (localized), who have chosen observation as their treatment plan. The use of pomegranate-extract pill may slow disease progression in patients with localized prostate cancer.

PRIMARY OBJECTIVES: I. To determine the effect of pomegranate fruit extract (PFE) 1000 mg, taken daily for 1 year, on the plasma levels of insulin-like growth factor (IGF-1) from baseline to end of study (52 weeks) in participants undergoing active surveillance (AS) for early stage prostate cancer. SECONDARY OBJECTIVES: I. To assess compliance with a once daily oral administration of PFE versus placebo over a 52-week period of time. II. To assess the toxicity of PFE vs. placebo when taken daily for 52 weeks (+/- 1 week). III. To compare and correlate the effect of 52 weeks of daily dosing with PFE vs placebo on the end of study biopsy results including the presence or absence of tumor, the extent of tumor and Gleason scores. IV. To compare and correlate the modulation of the following biomarkers with response to PFE versus placebo in three areas of interest: tissue from a completely benign biopsy core, tumor tissue from a positive core, and normal tissue adjacent to tumor from a positive core; plasma: insulin-like growth factor 1/IGF binding protein 3 ratio (IGF-1/IGFBP-3 ratio); prostate tissue (normal and abnormal): apoptosis (CASPASE 3), Ki-67, 8OHdG, IGF-1R, androgen receptor, IGF-1, IGFBP-3, prostate specific antigen (PSA). V. Measure PFE constituents/metabolites in plasma and urine for evidence of accumulation (trough levels): ellagic acid, dimethyl ellagic acid, dimethyl ellagic acid glucuronide (DMEAG), urolithin A, urolithin A-glucuronide, urolithin B and urolithin B-glucuronide. VI. Measure PSA doubling time (PSA DT) in serum, using the calculation provided on the Memorial Sloan Kettering Cancer Center website. VII. To assess the feasibility of cancer chemoprevention trials in a population of men undergoing active surveillance for prostate cancer. VIII. Measurement of serum testosterone. OUTLINE: Patients are randomized to 1 of 2 groups. GROUP I: Patients receive pomegranate-extract pill orally (PO) once daily (QD) for 52 weeks (+/- 1 week). GROUP II: Patients receive placebo PO QD for 52 weeks (+/- 1 week).

Study Type

INTERVENTIONAL

Allocation

Eligibility

Sex: MALEMin age: 21 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Participants must have had a standard-of-care biopsy within 13 months of the baseline study visit and must have been diagnosed with low-grade, clinically localized prostate cancer (Gleason score =\< 3+3 with a PSA at baseline \< 10 ng/ml in participants \< 70 years of age, OR Gleason score =\< 3+4 with a PSA at baseline =\< 15 ng/ml in participants \>= 70 years of age); eligible participants will be those men who are able and willing to undergo AS with PSA monitoring and a scheduled biopsy performed at the end of the study * No concurrent treatment (hormonal, radiation or systemic chemotherapy) for prostate cancer during study enrollment is planned (unless participants demonstrate clinical evidence of prostate cancer progression such as symptoms, physical exam findings, a rapidly increasing PSA, or radiologic findings which confirm disease progression) * Eastern Cooperative Oncology Group (ECOG) performance status =\< 1 * White blood cells (WBC) \>= 3000/mm\^3 * Platelets \>= 100,000 mm\^3 * Hemoglobin \>= 10 g/dL * Total bilirubin =\< 1.5 x upper limit of institutional normal * Alkaline phosphatase =\< 1.5 x upper limit of institutional normal * Aspartate aminotransferase (AST) =\< 1.5 x upper limit of institutional normal * Alanine aminotransferase (ALT) =\< 1.5 x upper limit of institutional normal * Serum creatinine within 1.5 x upper limit of institutional normal * Sodium 135-144 mmol/L (inclusive) * Potassium 3.2-4.8 mmol/L (inclusive) * Participants will be required to use a medically-approved method of birth control or abstinence if their sexual partner is of child-bearing potential * Participants must be willing to forego foods, beverages and supplements containing pomegranate for the duration of the study * Ability to understand, and the willingness to sign, a written informed consent document Exclusion Criteria: * Any prior surgery to the prostate within 30 days of baseline procedures; NOTE: Biopsies are not considered surgeries * Evidence of other cancer(s) (excluding non-melanoma skin cancer) within last 5 years * Prior pelvic radiation for any reason * Participants cannot be taking 5-alpha-reductase inhibitors while on study or within 6 months of the baseline study visit * Participants may not be taking carbamazepine (tegretol) * Participants may not be receiving any other investigational agents * History of allergic reactions attributed to compounds of similar chemical or biologic composition to PFE * Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, or psychiatric illness/social situations that would limit compliance with study requirements * Any significant cardiac event(s) within the 12 months prior to registration, such as episode(s) of symptomatic congestive heart failure, myocardial infarction, unstable angina pectoris or persistent, stable angina pectoris, or cardiac arrhythmia requiring medication

Locations (4)

Lahey Hospital and Medical Center

Burlington, Massachusetts, United States

University of Minnesota/Masonic Cancer Center

Minneapolis, Minnesota, United States

Urology San Antonio Research PA

San Antonio, Texas, United States

University of Wisconsin Hospital and Clinics

Madison, Wisconsin, United States

Outcomes

Primary Outcomes

Change in Plasma IGF-1 From Baseline to Post-Treatment

The primary endpoint for modulation of intermediate endpoint biomarkers will be the change in the plasma levels of IGF-1 by a quantitative assay (ELISA) from pre-study to post-treatment. The difference between these time points for the placebo group and the pomegranate fruit extract (PFE) group will be tested using a two-sample t-test with normalizing transformation if necessary or Wilcoxon rank-sum test.

Time frame: Baseline to 12 months

Secondary Outcomes

Compliance: Number of Participants Who Took Study Drug Per Protocol

Summarized by treatment arm with descriptive statistics, and tested for imbalance using Wilcoxon rank-sum test. Reported for each visit per protocol at Week 13, Week 26, Week 39, and Week 52 (end of study).

Time frame: Up to 1 year

Incidence of Adverse Events Graded Per Common Terminology Criteria for Adverse Events (CTCAE)

Patient toxicity throughout the study will be summarized in several ways; the presence or absence of any toxicity, worst CTCAE grade, and strongest investigator-defined relationship will all be examined and characterized by treatment arm, and analyzed appropriately (Wilcoxon rank-sum for ordinal data, Fisher's exact test for dichotomous data, and log rank test for time to event data).

Time frame: Up to 1 year

Change in Plasma Biomarker Levels From Baseline: IGFBP-3

Differences between the groups will be examined for the change from baseline with the appropriate tests; for dichotomous data Fisher's exact test will be used, for ordinal data Wilcoxon rank-sum test will be used, and for continuous data, and a two-sample t-test with normalizing transformation if necessary or Wilcoxon rank-sum test will be used.

Time frame: Week 13, Week 26, Week 39, Week 52

Change in Plasma Biomarker Levels From Baseline: IGF-1/GFBP-3

Time frame: Week 13, Week 26, Week 39, Week 52

Change in Total Serum Prostate Specific Antigen (PSA) From Baseline

Time frame: Up to 1 year

Change in Serum Testosterone

Time frame: up to 1 year

Prostate Specific Antigen Doubling Time (PSA DT)

PSA DT will be determined from PSA values obtained during study participation (baseline and weeks 13, 26, 39 and 52). The secondary endpoint of PSA DT is based on the value at study completion (week 52 or at point of early termination). However, PSA DT will be determined starting at week 26 (the earliest time point with 3 values) and week 39 and recorded. PSA doubling time is a measure based on the slope of the PSA at multiple time points. If the slope is relatively flat, the predicted doubling time could be far beyond the length of the actual study. As such, the value is not limited to the time frame over which data is collected from the participant.

Time frame: up to 52 Weeks

Change in Tissue Biomarker Levels: PSA

Compare and correlate biomarker modulation in response to PFE versus placebo in three areas of interest: tissue from a completely benign biopsy core ("benign" in results), tumor tissue from a positive core ("tumor" in results), and normal tissue adjacent to tumor from a positive core ("adjacent" in results). Differences between the groups will be examined for the change from baseline with the appropriate tests; for dichotomous data Fisher's exact test will be used, for ordinal data Wilcoxon rank-sum test will be used, and for continuous data, and a two-sample t-test with normalizing transformation if necessary or Wilcoxon rank-sum test will be used.