Does Protein Restriction Inhibit Prostrate Cancer Growth

The Purpose of the Protein Study is to investigate whether a reduced protein diet can inhibit the growth of prostate cancer in humans.

The Investigators hypothesis is that a reduced protein diet will inhibit expression of genes that are involved in the growth of prostate cancer.

Study Overview

• Status: Completed
• Conditions: Prostate Cancer
• Intervention / Treatment: Other: Protein restrictive diet

Detailed Description

The primary objective of this study is to determine whether or not a low protein diet has an inhibitory effect on prostate cancer cell growth.

The primary outcome measures relative to the investigators primary objectives are:

For Group 1 the expression of genes and proteins of the PI-3K/Akt/mTOR pathway. For Group 2 the PSA values obtained every three months.

• Study Type: Interventional
• Enrollment (Actual): 65
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Missouri
    • Saint Louis, Missouri, United States, 63110
      • Washington University School of Medicine

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult; Older Adult
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

Inclusion Criteria:

group 1

1. Patient must have a diagnosis of prostate cancer confirmed by pathology.
2. Patient must be scheduled to undergo radical prostatectomy no sooner than 6 weeks from date of enrollment (to allow for a minimum of 4 weeks on the low protein diet).
3. Patient must have adequate baseline protein intake (screening 4-day food record shows protein > 1.0 g/kg FFM)
4. Patient must be able to understand the English-language instructions.
5. Patient must be able to comply with the low protein diet (as evaluated by the dietitian and other study team members).
6. Patient must be able to understand and willing to sign an IRB-approved written informed consent document.

5.2.2 Inclusion Criteria - Group 2

1. Patient must have a diagnosis of prostate cancer.
2. Patient must have previously undergone a radical prostatectomy for treatment of prostate cancer.
3. Patient must have a detectable PSA (defined as PSA ≥ 0.1) in at least two consecutive measurements, taken at least one month apart, with no therapy between the PSA measurements. If the patient has had additional therapy after the radical prostatectomy, there must be evidence of a rising PSA (i.e., two consecutive measurements at least one month apart) after the patient has completed the intervening therapy (meaning that the patient must have failed treatment).
4. Patient must have adequate baseline protein intake (screening 4-day food record shows protein > 1.0 g/kg FFM).
5. Patient must have adequate baseline caloric intake (screening 4-day food record shows caloric intake of > 1500 kcal/day).
6. Patient must be able to understand the English-language instructions.
7. Patient must be able to comply with the low protein diet (as evaluated by the dietitian and other study team members).
8. Patient must be able to understand and willing to sign an IRB-approved written informed consent document.

Exclusion Criteria:

1. Patient must not currently be receiving any therapy for prostate cancer.
2. Patient must not have any serious chronic illness such as unstable angina, any uncontrolled metabolic disorder, or any immunologic disorder.
3. Patient must not have a history of any previous malignancy (with the exception of squamous or basal cell carcinoma of the skin) in the 5 years prior to enrollment (for Group 1) or 12 months prior to enrollment (for Group 2).
4. Patient must not have a previous history of a stroke.
5. Patient must not be taking any medications that might confound the study results (anabolic agents (such as androgen, androgen precursor, rhGH) in the 6 months prior to enrollment; corticosteroids (other than nasal) in the 6 months prior to enrollment; or finasteride or dutasteride).
6. Patient must not have dementia or any other cognitive impairment.

7. Patient must not have a lifestyle or fixed diet pattern that would interfere with participation in or interpretation of the results of this study

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Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
No Intervention: Control; No changes in dietary group
Experimental: Protein restrictive diet; reduced protein diet	Other: Protein restrictive diet; To begin a reduced protein diet

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Group1--Expression of genes and proteins of the PI-3K/Akt/mTOR pathway. Group 2--PSA values obtained every three months	The investigators will be looking at the increase or decrease of PSA values between control and protein restricted diet participants obtained for the length of study.	group 1- (4-6 weeks), group 2 -(52 weeks)

Collaborators and Investigators

• Sponsor: Washington University School of Medicine
• Investigators: Principal Investigator: Valeria Tosti, MD, Washington University School of Medicine; Principal Investigator: Luigi Fontana, MD,PhD, Washington University School of Medicine

Publications and helpful links

General Publications

• Fontana L, Cummings NE, Arriola Apelo SI, Neuman JC, Kasza I, Schmidt BA, Cava E, Spelta F, Tosti V, Syed FA, Baar EL, Veronese N, Cottrell SE, Fenske RJ, Bertozzi B, Brar HK, Pietka T, Bullock AD, Figenshau RS, Andriole GL, Merrins MJ, Alexander CM, Kimple ME, Lamming DW. Decreased Consumption of Branched-Chain Amino Acids Improves Metabolic Health. Cell Rep. 2016 Jul 12;16(2):520-530. doi: 10.1016/j.celrep.2016.05.092. Epub 2016 Jun 23.
• Trevino-Villarreal JH, Reynolds JS, Bartelt A, Langston PK, MacArthur MR, Arduini A, Tosti V, Veronese N, Bertozzi B, Brace LE, Mejia P, Trocha K, Kajitani GS, Longchamp A, Harputlugil E, Gathungu R, Bird SS, Bullock AD, Figenshau RS, Andriole GL, Thompson A, Heeren J, Ozaki CK, Kristal BS, Fontana L, Mitchell JR. Dietary protein restriction reduces circulating VLDL triglyceride levels via CREBH-APOA5-dependent and -independent mechanisms. JCI Insight. 2018 Nov 2;3(21):e99470. doi: 10.1172/jci.insight.99470.
• Eitan E, Tosti V, Suire CN, Cava E, Berkowitz S, Bertozzi B, Raefsky SM, Veronese N, Spangler R, Spelta F, Mustapic M, Kapogiannis D, Mattson MP, Fontana L. In a randomized trial in prostate cancer patients, dietary protein restriction modifies markers of leptin and insulin signaling in plasma extracellular vesicles. Aging Cell. 2017 Dec;16(6):1430-1433. doi: 10.1111/acel.12657. Epub 2017 Sep 17.

Study record dates

Study Major Dates

• Study Start (Actual): January 1, 2011
• Primary Completion (Actual): March 1, 2015
• Study Completion (Actual): March 1, 2015

Study Registration Dates

• First Submitted: September 7, 2012
• First Submitted That Met QC Criteria: September 20, 2012
• First Posted (Estimate): September 25, 2012

Study Record Updates

• Last Update Posted (Actual): March 26, 2021
• Last Update Submitted That Met QC Criteria: March 24, 2021
• Last Verified: March 1, 2021

More Information

Terms related to this study

• Keywords: PSA; prostate; protein
• Additional Relevant MeSH Terms: Neoplasms; Urogenital Neoplasms; Neoplasms by Site; Genital Neoplasms, Male; Prostatic Diseases; Prostatic Neoplasms
• Other Study ID Numbers: 201011804

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: Plan to publish