A Study of Grape Seed Extract in Asymptomatic Non-Metastatic Prostate Cancer Patients with Rising PSA

March 20, 2025 updated by: University of Colorado, Denver

A Phase 2 Study of Grape Seed Extract (GSE) Product in Asymptomatic Non-Metastatic Prostate Cancer Patients with Rising Prostate Specific Antigen (PSA)

Patients will take 150 mg of GSE product by mouth twice daily and will be evaluated every 6 weeks for 3 months, then every 3 months thereafter for up to one year.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Patients will take 150 mg of GSE product by mouth twice daily in the form of 75 mg capsule of Leucoselect Phytosome preparation; total oral dosage is 300 mg GSE per day for one year. Patients will be evaluated every 6 weeks for 3 months, then every 3 months thereafter for up to one year. PSA measurements will be obtained at these scheduled visits and patients must not have a doubling of their PSA (compared to baseline) by 3 months in order to continue on study. Patients who meet criteria to continue on study will be treated until disease progression or for one year (whichever comes first).

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
41

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Colorado
      • Aurora, Colorado, United States, 80045
        • University of Colorado Cancer Center
      • Fort Collins, Colorado, United States, 80524
        • Poudre Valley Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 99 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Written informed consent has been obtained.
  2. Adults > or = 18 years of age.
  3. Histologically confirmed prostate adenocarcinoma.
  4. Evidence of rising PSA, on 2 separate occasions, at least one week apart. Baseline PSA must be ≥ 0.2 ng/mL at the time of screening. Radiographic evidence of disease is not allowed.
  5. Patients must have sufficient PSA time points prior to enrollment (a minimum of 3 PSA levels within a six month period) to calculate a baseline PSA doubling time.
  6. Patients must not be on active LHRH agonist/antagonist therapy and must have testosterone level > 50 ng/dL.
  7. Patients must not be on active anti-androgen therapy or 5-alpha reductase inhibitors. Patients on stable dose of 5-alpha reductase inhibitors for benign prostatic hypertrophy for at least 12 months may continue. They must withdraw from the study if this is stopped while on study.
  8. Patients who are candidates for local salvage therapy must have had this option pursued or discussed; and the patient must have either declined salvage therapy or was deemed not to be a candidate for salvage therapy.
  9. Patients who have PSA recurrence after local salvage therapy may participate in this study.
  10. Patients with hormone sensitive disease who received prior androgen deprivation therapy as part of primary/salvage local treatment or patients receiving intermittent androgen deprivation therapy will be allowed to participate.
  11. Eastern Cooperative Oncology Group (ECOG) performance status 0-2.
  12. Adequate hematologic function (absolute neutrophil count [ANC]≥1,500 cells/µL; hemoglobin ≥9 g/dL, platelets ≥75,000/µL).
  13. Adequate renal function (serum creatinine ≤ 2X the upper limit of normal (ULN)
  14. Adequate hepatic function (total bilirubin ≤ 2 x upper limit of normal [ULN], alanine aminotransferase [ALT]≤ 3xULN, aspartate aminotransferase [AST]≤3 x ULN).
  15. Patients can continue taking what they are taking at the time they start on the study, but agree not to start any new (over the counter) herbal supplement on regular basis during study duration.
  16. Prior chemotherapy for prostate cancer (upfront, adjuvant, etc.) is allowed as long as it was not given for hormone-refractory disease.

Exclusion Criteria:

  1. Patients who are on active surveillance for untreated localized disease may not participate in this study.
  2. Inability to swallow gelatin capsules, or any medical condition that interferes with normal gastrointestinal absorption.
  3. Major surgery, radiation, or treatment with any other investigational drug within 2 weeks of study treatment.
  4. Documented hypersensitivity reaction to any product with GSE (see complete list in Appendix 1).
  5. Known chronic infection with human immunodeficiency virus (HIV) or viral hepatitis.
  6. Symptomatic prostate cancer as determined by cancer-related pain requiring narcotic pain medication.
  7. History of another cancer is exclusionary unless it is believed to be likely cured or is unlikely to be fatal in the next 3 years (e.g. squamous cell carcinoma, superficial bladder cancer, chronic lymphocytic leukemia, etc).
  8. Very fast PSA doubling time of less than 4 weeks, if the absolute PSA is > 2 ng/mL.
  9. Known allergy/intolerance to soy, phosphatidycholine or any other constituents of grape seed extract.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: 150 mg of Grape Seed Extract (GSE)
150 mg of GSE twice daily in the form of 75 mg capsule of Leucoselect Phytosome preparation.
Dietary supplement: Grape Seed Extract
Patients will take 150 mg of Grape Seed Extract (GSE) product by mouth twice daily (in the form of 75 mg capsule of Leucoselect Phytosome preparation). Total oral dosage is 300 mg of GSE per day for one year. Patients will be evaluated every 6 weeks for 3 months, then every 3 months thereafter for up to one year. PSA measurements will be obtained at these scheduled visits.
Other Names:
  • Leucoselect Phytosome

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
The number of patients with PSA response
Time Frame: 6 weeks and 3, 6, 9, and 12 months
PSA response will be defined as an increase in prostate specific antigen (PSA) doubling time (PSADT) of 30% (PSADT is the length of time it takes for a PSA to double based on an exponential growth pattern). Patients must have a PSA level of ≥ 0.2 at study entry and should have at least three prior PSA values with dates from which to calculate a PSA doubling time.
6 weeks and 3, 6, 9, and 12 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
The rate of change of the PSA over time (PSA velocity) for each patient
Time Frame: 6 weeks and 3, 6, 9, and 12 months
PSA velocity will be calculated as a change from the first PSA reading, standardized as PSA change per month. PSA Response will be defined as increase in PSADT of 30% (PSADT is the length of time it takes for a PSA to double based on an exponential growth pattern). Biomarkers will be defined as proinflammatory cytokines, lipid and comprehensive metabolic panel in patient serum samples as well as, gut microbiome (measured by by high-throughput16S sequencing), plasma and stool metabolomics (after short and long-term consumption of GSE), and the effects of diet on gut microbiome.
6 weeks and 3, 6, 9, and 12 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Colorado, Denver

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Cancer League of Colorado

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Paul Maroni, MD, University of Colorado, Denver

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 18, 2018

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
September 29, 2023

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
September 29, 2023

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
March 13, 2017

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 17, 2017

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
March 23, 2017

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 25, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 20, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
March 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 16-0607.cc

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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