Muscadine Plus (MPX) In Men With Prostate Cancer

NCT ID: NCT03535675

Last Updated: 2023-05-22

Basic Information

• Recruitment Status: TERMINATED
• Clinical Phase: PHASE3
• Total Enrollment: 59 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2018-10-30
• Study Completion Date: 2022-11-03

Brief Summary

This research is being done to determine if men with rising PSA after initial therapy for localized prostate cancer who display the Alanine/Alanine SOD2 genotype of MnSOD and supplement their diet with MPX have greater decrease in PSA slope following treatment compared to men that do not supplement with MPX.

Detailed Description

Prostate specific antigen (PSA) is a single-chain glycoprotein produced by the epithelial cells of the prostate. PSA has been used for early detection and monitoring of patients with prostate cancer who receive a variety of treatments. Due to the widespread use of serum PSA to monitor for prostate cancer recurrence following primary treatment, there exists a group of men with a rising PSA as their only evidence of recurrence. These patients may not demonstrate clinical or radiographic evidence of disease progression for an average 8 years from the time of detectable PSA to detectable metastatic disease by standard imaging. Currently there are limited treatment options for these patients that may delay disease progression or improve survival, including salvage radiation for prior surgical patients, hormonal therapy, and active surveillance.

Although some surgical patients are candidates for salvage radiation, not all patients will want salvage radiation. Even the early initiation of hormonal therapy (e.g., luteinizing hormone releasing hormone (LHRH) analogs) has not demonstrated a survival benefit, although Schroder et al suggests an advantage for early hormone therapy in the setting of metastatic regional lymph nodes. Furthermore, early initiation of androgen ablation is associated with significant morbidity and impact on quality of life, including fatigue, hot flashes, loss of libido, decreased muscle mass, and osteoporosis with long term use. This group of relatively well men with biochemical recurrence are currently offered androgen ablation therapy or active surveillance (regular PSA monitoring and annual scans) until there is evidence of metastatic disease, because other options have not been available. These patients are excellent candidates for innovative treatments hypothesized to slow the progression of clinical prostate cancer and delay the development of metastatic disease.

As the previous section documents, preclinical studies of muscadine grape skin offer evidence that it may extend the time between biochemical recurrence and development of metastatic disease. While the Phase II study described above found no significant difference in PSA doubling time between placebo and either dose of MPX, there was a signal of benefit in the subgroup analysis of men with the Alanine/Alanine superoxide dismutase 2 (SOD2) genotype that received high dose MPX. It is therefore proposed to test the benefits of high dose MPX in capsule formulation in a randomized, controlled study of men who have failed primary therapy, either radiation, surgery or cryotherapy, as primary treatment for prostate cancer. Eligible subjects will have a rising PSA and will have 3 PSA values at least 7 days apart with a recovered testosterone to be able to calculate a baseline PSA doubling time. The primary endpoint of this study will be mean PSA slope during the study period.

Conditions

Adenocarcinoma of the Prostate

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: QUADRUPLE

Study Groups

Muscadine Plus

Each treatment cycle consists of once daily oral dosing of 4000 mg Muscadine Plus, every day throughout each 12 week (84 day) cycle. Patients may continue to receive additional cycles of study drug and will be followed every three months with standard visits with their physician until completion of 48 weeks of study treatment, disease progression, or until they wish to discontinue the drug.

Group Type: EXPERIMENTAL

Muscadine Plus

Intervention Type: DRUG

Ellagic acid inhibits DNA Methyltransferase. DNA Methyltransferases (DNMTs) are a family of enzymes that regulate chromatin methylation and use S-adenosyl methionine (SAM) as the methyl donor. Ellagic acid's metabolite, urolithin-A inhibits the protein complex nuclear factor kappa-light-enhancer of activated B-cells (NFkB), potentially leading to increased rates of apoptosis and decreases in cancer cell proliferation. Extracts from Vitis rotundifolia have shown inhibition of the phosphatidylinositol 3-kinase-Akt pathway.

Placebo

Each treatment cycle consists of once daily oral dosing of 4000 mg placebos, every day throughout each 12 week (84 day) cycle. Patients may continue to receive additional cycles of placebo and will be followed every three months with standard visits with their physician until completion of 48 weeks of study treatment, disease progression, or until they wish to discontinue the drug.

Group Type: EXPERIMENTAL

Placebos

Intervention Type: DRUG

The placebo capsules are rice flour that will be placed in white opaque capsules identical to the ones used for MPX.

Interventions

Muscadine Plus

Ellagic acid inhibits DNA Methyltransferase. DNA Methyltransferases (DNMTs) are a family of enzymes that regulate chromatin methylation and use S-adenosyl methionine (SAM) as the methyl donor. Ellagic acid's metabolite, urolithin-A inhibits the protein complex nuclear factor kappa-light-enhancer of activated B-cells (NFkB), potentially leading to increased rates of apoptosis and decreases in cancer cell proliferation. Extracts from Vitis rotundifolia have shown inhibition of the phosphatidylinositol 3-kinase-Akt pathway.

Intervention Type: DRUG

Placebos

The placebo capsules are rice flour that will be placed in white opaque capsules identical to the ones used for MPX.

Intervention Type: DRUG

Other Intervention Names

MPX; Placebo

Eligibility Criteria

Inclusion Criteria

Patients meeting the following conditions are eligible for registration and participation in the study:

1. Subject has histologically or cytologically confirmed adenocarcinoma of the prostate

2. Subject has undergone definitive treatment (surgery, surgery with radiation therapy, cryotherapy, radiation therapy or brachytherapy) for the primary prostate tumor (prior chemotherapy is not allowed) .

a. A subject with a rising PSA post-prostatectomy should consider radiation as a potentially curative alternative. If subject declines radiation or is not a candidate for radiation, he may be considered eligible in this setting.

3. Subject has a rising PSA on a minimum of 3 time points (2 rises) within the 12 months prior to study initiation (this will include the PSA measurement taken at the screening visit, but not at the baseline day 0 study visit).

For purposes of calculating PSA doubling time (PSADT):

1. All PSA values used in the calculation should be ≥ 0.20 ng/ml and overall should follow a rising trend;

2. Record every available PSA drawn within the last 12 months of the most recent local PSA;

3. The minimum requirement is 3 PSA values obtained over 3 months with a minimum of 4 weeks between measurements;

4. If there are 4 or more PSAs available, the time interval between the first and last PSA measurements must be at least 3 months, and, there is no minimum time interval requirement between any two PSA measurements;

5. For radiotherapy only patients, record PSA nadir value and collection date. PSADT (PSA doubling time) must be positive according to Memorial Sloan Kettering Cancer Center Prostate Cancer Nomograms under this link: http://www.mskcc.org/applications/nomograms/prostate/PsaDoublingTime.aspx

4. One of the following criteria must be met.

1. Absolute level of PSA >0.4 ng/mL following surgery. (surgery only)

2. Absolute level of PSA >0.4 ng/mL for subjects treated with multiple treatment modalities (e.g., surgery + radiation, surgery + cryotherapy, etc.).

3. A rise by 2 ng/mL or more above the nadir PSA will be considered the standard definition for biochemical failure after radiation therapy with or without hormonal therapy. (radiation only)

5. Subject is >18 years of age.

6. Subject has life expectancy of greater than 12 months.

7. Subject has Eastern Cooperative Oncology Group performance status 0, 1 or 2

8. Subject has testosterone level of ≥1.5 ng/mL at screening.

9. Subject has normal organ and marrow function as defined below:

1. Leukocytes >3,000/microliter

2. absolute neutrophil count >1,500/microliter

3. platelets >100,000/microliter

4. total bilirubin <1.5 x upper limit of normal except for Gilberts <2.5 x upper limit of normal

5. aspartate aminotransferase/Alanine transaminase ≤ 2.5 X upper limit of normal

6. creatinine ≤ 2.5 upper limit of normal

10. Subject agrees to abstain from other commercially available MuscadinePlus (MP) products (Vinetra, MuscadinePlus or MP capsules) while participating in this study.

11. Subject's use of other dietary/herbal supplements (e.g. saw palmetto, selenium, pomegranate juice or pills, acai concentrated extract, etc) has been stable for at least 2 months prior to screening and the subject agrees not to stop or change the dose(s) while participating in the study.

12. Subject has signed a written informed consent document and agrees to comply with requirements of the study.

13. CT or MRI chest/abdomen/pelvis and bone scan without evidence of metastatic disease as an inclusion.

14. Subject agrees to genotyping of manganese-dependent superoxide dismutase 2 (MnSOD2) gene and any genetic counseling. Only those with Alanine/Alanine SOD2 genotype will be randomized.

Exclusion Criteria

Subjects meeting the following conditions are not eligible for participation in the study:

1. Subject has known radiographic evidence of metastatic disease, except for presence of positive lymph nodes from the surgical pathology. Pelvic/intraperitoneal lymph nodes less than 1.5 cm maybe considered nonspecific and the patient would be eligible. If there is any clinical suspicion for metastatic disease, CT and Bone Scan must be performed to rule out metastatic disease, within the last four months, per standard of care.

2. Subject has received any therapies that modulate testosterone levels (e.g., androgen ablative/anti-androgen therapy, 5 alpha reductase inhibitors) for a minimum of 12 months prior to study.

3. Subject has had prior or concomitant treatment with experimental drugs, high dose steroids, or any other cancer treatment within 4 weeks prior to the first dose of the study product.

4. Subject has consumed any Muscadine Plus over the past 2 months.

5. Subject has a known allergy to muscadine grapes, ellagic acid or rice

6. Subject has uncontrolled concurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.

7. Subject has negative PSA doubling time (negative doubling time corresponds with decreasing PSA) Doubling time may be computed using the Sloan Kettering prediction tools posted at http://www.mskcc.org/applications/nomograms/prostate/PsaDoublingTime.aspx

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 99 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: No

Sponsors

Greater Washington Community Foundation

UNKNOWN

Sponsor Role: collaborator

Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Channing Paller, M.D

Role: PRINCIPAL_INVESTIGATOR

SKCCC at Johns Hopkins

Locations

City of Hope

Duarte, California, United States

UC San Diego Moores Cancer Center

La Jolla, California, United States

University of Colorado Cancer Center

Aurora, Colorado, United States

Sibley Memorial Hospital

Washington D.C., District of Columbia, United States

University of Chicago

Chicago, Illinois, United States

Johns Hopkins Hospital

Baltimore, Maryland, United States

Dana-Farber Cancer Institute

Boston, Massachusetts, United States

University of Michigan

Ann Arbor, Michigan, United States

Karmanos Cancer Institute

Detroit, Michigan, United States

Allegheny Health Network

Pittsburgh, Pennsylvania, United States

Carolina Urologic Research Center

Myrtle Beach, South Carolina, United States

Huntsman Cancer Institute

Salt Lake City, Utah, United States

University of Virginia

Charlottesville, Virginia, United States

Countries

United States

References

Mandl A, Zahurak ML, Metri NA, Shore ND, Mao S, McKay RR, Taplin ME, Szmulewitz RZ, Maughan BL, Reichert ZR, Kessler ER, Heath EI, Dreicer R, Stein CA, Milne GL, Sfanos KS, Ernst SE, Mummert LA, Cruz-Lebron A, Michel SLJ, Kane MA, Hursey M, Worth MA, Wagner WD, Eshleman JR, Debeljak M, Xu L, Cao H, Dowling D, Marshall CH, Markowski MC, Denmeade SR, Eisenberger MA, Antonarakis ES, Carducci MA, Paller CJ. Muscadine Grape Skin Extract in Biochemically Recurrent Prostate Cancer: A Randomized, Placebo-Controlled, Biomarker-Enriched Trial in Patients With the SOD2 Ala/Ala Variant. Prostate. 2025 Jul;85(10):966-976. doi: 10.1002/pros.24903. Epub 2025 May 5.

Reference Type: DERIVED

PMID: 40325900 (View on PubMed)

Provided Documents

Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

IRB00166021

Identifier Type: OTHER

Identifier Source: secondary_id

J1823

Identifier Type: -

Identifier Source: org_study_id