Fatty Acid Synthase Inhibition in Castration Refractory Prostate Cancer (FASN)

Wake Forest University (WFU) logo

Wake Forest University (WFU)

Status and phase

Phase 2


Refractory Cancer
Castration Resistant Prostatic Cancer
Prostate Cancer


Drug: Omeprazole 80 mg twice daily

Study type


Funder types



P30CA012197 (U.S. NIH Grant/Contract)
WFBCC 85220 (Other Identifier)

Details and patient eligibility


The purpose of this research study is to find out what effects (good and bad) omeprazole and cabazitaxel, or omeprazole and docetaxel, has on participants and their condition. Investigators believe omeprazole may help the other medications work.

Full description

Primary Objective(s): Obtain Overall Response Rate (ORR) to taxane therapy by adding the fatty acid synthase inhibitor, omeprazole to the current "failing" taxane regimen in 15% of subjects using Prostate Cancer Clinical Trials Working Group 3 (PCWG3) criteria, defined by partial response (PR) or complete response (CR) Secondary Objectives (only at patients treated at Wake Forest Baptist Comprehensive Cancer Center main campus): Pharmacodynamics-demonstrate omeprazole in vivo fatty acid synthase inhibition by 11C-Acetate PET/CT (3-6) Non-invasive approach to demonstrate the fatty acid synthase inhibitor (omeprazole) is hitting its target Obtain a prostate specific antigen response rate by adding the fatty acid synthase inhibitor omeprazole to the current "failing" taxane regimen. (16) Measure pain using the Patient-Reported Outcomes Measurement Information System (PROMIS) at Baseline, Cycle 5, Cycle 12, and every cycle thereafter.


20 estimated patients




18+ years old


No Healthy Volunteers

Inclusion criteria

  • Patients must have castrate refractory prostate cancer with prior taxane treatment (docetaxel or cabazitaxel) which was used in the castrate refractory setting
  • Cancer Progression as defined by PCWG3
  • Age 18 or older.
  • ECOG 0, 1, or 2
  • Life expectancy of greater than 2 months
  • Men must agree to use adequate contraception (barrier method of birth control; abstinence) prior to study entry and for the duration of study participation.
  • Ability to understand and the willingness to sign an IRB-approved informed consent document (either directly or via a legally authorized representative).
  • Organ & marrow function as defined below: Absolute neutrophil count >1,200/mcL Platelets >75,000/mcL; total bilirubin= within normal institutional limits; AST(SGOT)/ALT(SGPT) <2.5 X institutional upper limit of normal; creatinine <2.5 X institutional upper limit of normal

Exclusion criteria

  • Patients may not be receiving any other investigational agents.
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to omeprazole or taxane therapy.
  • Uncontrolled intercurrent 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.

Trial design

Primary purpose




Interventional model

Single Group Assignment


None (Open label)

20 participants in 1 patient group

Omeprazole Plus Standard of Care for Prostate Cancer Regimen
Experimental group
This intervention will be given on an outpatient basis. Omeprazole, 80 mg twice daily.
Drug: Omeprazole 80 mg twice daily

Trial contacts and locations



Central trial contact

Study Nurse

Data sourced from clinicaltrials.gov

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