A Study of Pre-operative Metformin in Prostate Cancer - Full Text View

Sponsor:	University Health Network, Toronto
Collaborator:	Jewish General Hospital
Information provided by:	University Health Network, Toronto
ClinicalTrials.gov Identifier:	NCT00881725

Purpose

This study will investigate the effect of neoadjuvant metformin therapy in the inhibition of growth and proliferation of prostate cancer cells prior to radical prostatectomy.

Condition	Intervention	Phase
Prostate Cancer	Drug: Metformin	Phase 2

Study Type:	Interventional
Study Design:	Endpoint Classification: Safety/Efficacy Study Intervention Model: Single Group Assignment Masking: Open Label Primary Purpose: Treatment
Official Title:	A Phase II, Open Label Assessment of Neoadjuvant Intervention With Metformin Against Tumour Expression of Signaling

Resource links provided by NLM:

MedlinePlus related topics: Cancer Diabetes Medicines Prostate Cancer

Drug Information available for: Metformin Metformin hydrochloride

U.S. FDA Resources

Further study details as provided by University Health Network, Toronto:

Primary Outcome Measures:

Difference in P-AKT staining [ Time Frame: Pre-Surgery ] [ Designated as safety issue: No ]

Secondary Outcome Measures:

Other immunohistochemical assays: Ki67, IR, IGF-1R, p70S6K, AMPK, MVD, Cleaved caspase 3, PTEN [ Time Frame: Pre-Surgery ] [ Designated as safety issue: No ]
Differences in measures of insulin resistance: waist/hip ratio, fasting blood glucose, post-prandial blood glucose, weight [ Time Frame: Pre-Surgery, Post-Surgery ] [ Designated as safety issue: Yes ]
Differences in PSA levels [ Time Frame: Pre-Surgery, Post-Surgery ] [ Designated as safety issue: No ]
Incidence of adverse events, serious adverse events, and grade 3-4 toxicities [ Time Frame: Pre-Surgery, Post-Surgery ] [ Designated as safety issue: Yes ]

Estimated Enrollment:	40
Study Start Date:	June 2009
Estimated Study Completion Date:	November 2011
Primary Completion Date:	March 2011 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
Experimental: Metformin 500mg t.i.d. for 4-12 weeks prior to Radical Prostatectomy	Drug: Metformin 500mg tablets t.i.d. for 4-12 weeks prior to Radical Prostatectomy

Detailed Description:

Prostate cancer is the most commonly diagnosed malignancy in men in North America, with close to a quarter of a million cases diagnosed in 2007 alone (Joshua et al, 2007). The activation of the PTEN/ AKT pathway is thought to be of importance in prostatic carcinogenesis as it correlates with a poor prognosis (Yoshimoto et al, 2007) (Schmitz et al, 2007). Components of this cellular pathway have pleiotropic targets including the mTOR complex. In model systems, tumours exhibiting activation of PI3K/AKT kinase are sensitive to mTOR inhibitors.

Metformin (1,1-dimethylbiguanide hydrochloride) belongs to the biguanide class of oral hypoglycaemic agents and is a commonly prescribed medication for a number of conditions. It is the first-line drug of choice for the treatment of type 2 diabetes. Its mechanism of action is thought to be the primary inhibition of hepatic glucose output through inhibition of gluconeogenesis. Subsequently, metformin causes a decline in the circulating insulin level (Hundal et al, 2000).

Metformin causes inhibition of the mTOR complex. The mTOR complex is primarily inhibited through activation of AMPK (a component of the PTEN/AKT pathway). Metformin causes reduced hepatic glucose output leading to decreased levels of circulating insulin which causes the secondary inhibition of the mTOR complex. Metformin has also been shown to inhibit cyclin D1 expression and retinoblastoma protein (Rb) phosphorylation. Inhibition of Cyclin D1 and Rb phosphorylation cause inhibition of G1/S phase transition of the cell cycle. This results in the inhibition of cell proliferation (Matsushime et al, 1994).

This study will investigate the effect of neoadjuvant metformin therapy in the inhibition of growth and proliferation of prostate cancer cells prior to radical prostatectomy.

Eligibility

Ages Eligible for Study:	18 Years to 75 Years
Genders Eligible for Study:	Male
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

1. Patients with histologically confirmed prostate cancer involving at least 20% of at least one unfragmented biopsy core;
Over the age of 18 and under the age of 75;
Ability to read and understand the consent form, either alone or with the aid of a translator
ECOG performance status less than or equal to 2 (Karnofsky greater than or equal to 60%);
Patients must have their TRUS biopsy performed at the UHN in the last 3 months;
Patients must have normal organ and marrow function as defined by the following criteria:
1. Absolute neutrophil count greater than or equal to 1,500/uL
2. Platelets greater than or equal to 100,000/uL
3. Total bilirubin less than or equal to 1.5 X institutional ULN
4. AST(SGOT)/ALT(SGPT) less than or equal to 1.5 X institutional ULN
5. Creatinine less than or equal to 1.4 X institutional ULN

Exclusion Criteria:

Patients who on initial assessment are found to be on treatment with any drug used for the treatment of any form of diabetes, or patients that begin treatment for any form of diabetes during the course of the study;
Patients may not be receiving any other investigational, herbal or anticancer agents while on study;
Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, congestive heart failure (NYHA Class 3 or greater), cirrhosis with a Child-Pugh level of B or greater or evidence of cardiac dysfunction, unstable angina pectoris, cardiac arrhythmia, active peptic ulcer disease, clinically significant gastrointestinal conditions (e.g. Crohns disease, ulcerative colitis), COPD or psychiatric illness/social situations that would limit compliance with study requirements;
Active malignancy at any other site excluding squamous cell or basal cell carcinomas of the skin
Radiotherapy within the past 4 weeks;
Patients with a current history of alcohol intake (>2 standard drinks/day) or binge drinking (5 or more drinks (male), or 4 or more drinks (female)) in one session of 1-3 hours;
Past history of lactic acidosis or risk factors for lactic acidosis such as congestive heart failure (NYHA Class 3 or greater), hypoxia (resting PO2 < 91%) or renal insufficiency (eGFR < 60 mls/min)
Patients taking systemic glucocorticoids or estrogenic compounds.
Patients with known hypersensitivity or allergy to metformin or any of its excipients.
Patients with a history of impaired liver or kidney function.

Contacts and Locations

Please refer to this study by its ClinicalTrials.gov identifier: NCT00881725

Locations

Canada, Ontario
University Health Network
Toronto, Ontario, Canada, M5G2M9

Sponsors and Collaborators

University Health Network, Toronto

Jewish General Hospital

Investigators

Principal Investigator:

Anthony Joshua, M.D.

University Health Network, Toronto

More Information

Publications:

Joshua AM, Evans A, Van der Kwast T, Zielenska M, Meeker AK, Chinnaiyan A, Squire JA. Prostatic preneoplasia and beyond. Biochim Biophys Acta. 2008 Apr;1785(2):156-81. Epub 2007 Dec 8. Review.

Yoshimoto M, Cunha IW, Coudry RA, Fonseca FP, Torres CH, Soares FA, Squire JA. FISH analysis of 107 prostate cancers shows that PTEN genomic deletion is associated with poor clinical outcome. Br J Cancer. 2007 Sep 3;97(5):678-85. Epub 2007 Aug 14.

Schmitz M, Grignard G, Margue C, Dippel W, Capesius C, Mossong J, Nathan M, Giacchi S, Scheiden R, Kieffer N. Complete loss of PTEN expression as a possible early prognostic marker for prostate cancer metastasis. Int J Cancer. 2007 Mar 15;120(6):1284-92.

Hundal RS, Krssak M, Dufour S, Laurent D, Lebon V, Chandramouli V, Inzucchi SE, Schumann WC, Petersen KF, Landau BR, Shulman GI. Mechanism by which metformin reduces glucose production in type 2 diabetes. Diabetes. 2000 Dec;49(12):2063-9.

Matsushime H, Quelle DE, Shurtleff SA, Shibuya M, Sherr CJ, Kato JY. D-type cyclin-dependent kinase activity in mammalian cells. Mol Cell Biol. 1994 Mar;14(3):2066-76.

Responsible Party:	Dr. Anthony Joshua, University Health Network
ClinicalTrials.gov Identifier:	NCT00881725 History of Changes
Other Study ID Numbers:	PMH-ANIMATE-001
Study First Received:	April 14, 2009
Last Updated:	July 21, 2011
Health Authority:	Canada: Health Canada

Keywords provided by University Health Network, Toronto:

Metformin
Prostate Cancer
Radical Prostatectomy

Neoadjuvant Intervention
PTEN/AKT Pathway
Tumour Expression

Additional relevant MeSH terms:

Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Neoplasms
Genital Diseases, Male

Prostatic Diseases
Metformin
Hypoglycemic Agents
Physiological Effects of Drugs
Pharmacologic Actions

ClinicalTrials.gov processed this record on May 23, 2012