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Enzalutamide and Indomethacin in Treating Patients With Recurrent or Metastatic Hormone-Resistant Prostate Cancer

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT02935205
Recruitment Status : Recruiting
First Posted : October 17, 2016
Last Update Posted : June 30, 2022
National Cancer Institute (NCI)
Information provided by (Responsible Party):
Mamta Parikh, University of California, Davis

Brief Summary:
This phase I/II trial studies the side effects of enzalutamide and indomethacin and to see how well they work in treating patients with prostate cancer that does not respond to treatment with hormones, has come back, or has spread from where it started to other places in the body. Androgens can cause the growth of prostate cancer cells. Hormone therapy using enzalutamide and indomethacin may fight prostate cancer by lowering the amount of androgen the body makes and/or blocking the use of androgen by the tumor cells.

Condition or disease Intervention/treatment Phase
Metastatic Prostate Carcinoma Recurrent Prostate Carcinoma Stage IV Prostate Cancer Drug: Enzalutamide Drug: Indomethacin Phase 1 Phase 2

Detailed Description:


I. To assess the toxicity of indomethacin and enzalutamide when given in combination, and to determine the prostate-specific antigen (PSA) response that is defined as a 50% or more reduction from the baseline.


I. To determine the overall response as determined by the Prostate Cancer Working Group 2 criteria (PCWG2).

II. To evaluate the progression-free survival (PFS) and overall survival of castration-resistant prostate cancer (CRPC) patients treated with indomethacin and enzalutamide.

III. To evaluate molecular correlatives for patient response and outcomes through the analysis of patient baseline tumor specimens (diagnostic biopsy) along with serial blood specimens.


Patients receive enzalutamide orally (PO) once daily (QD) and indomethacin PO twice daily (BID) or QD. Courses repeat every 4 weeks in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed up for 3 months.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 38 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase I/II Study of Enzalutamide in Combination With Indomethacin in Castration-Resistant Prostate Cancer (CRPC)
Actual Study Start Date : January 17, 2017
Estimated Primary Completion Date : January 2023
Estimated Study Completion Date : June 2023

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Prostate Cancer

Arm Intervention/treatment
Experimental: Treatment (enzalutamide, indomethacin)
Patients receive enzalutamide PO QD and indomethacin PO BID or QD. Courses repeat every 4 weeks in the absence of disease progression or unacceptable toxicity.
Drug: Enzalutamide
Given PO
Other Names:
  • ASP9785
  • MDV3100
  • Xtandi

Drug: Indomethacin
Given PO
Other Names:
  • Indocin
  • Indometacin

Primary Outcome Measures :
  1. Incidence of adverse events evaluated according to National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0 [ Time Frame: Up to 3.5 years ]
    Adverse events and adverse events of grade 3 or higher will be listed for each patient and summarized by body system in a frequency table.

  2. PSA response rate defined as >= 50% decrease from the baseline [ Time Frame: Up to 3.5 years ]
    The characteristics of the study participants will be summarized using frequencies and percentages for categorical variables and descriptive statistics (mean, standard deviation, median, minimum, maximum) for numeric variables. The proportion of participants who experience a PSA response will be computed, along with the exact 95% confidence interval.

Secondary Outcome Measures :
  1. Overall response determined by PCWG2 criteria [ Time Frame: Up to 3.5 years ]
  2. Overall survival [ Time Frame: Up to 3.5 years ]
    Will be estimated using the product-limit method of Kaplan and Meier; medians and 95% confidence intervals will be computed.

  3. PFS [ Time Frame: Up to 3.5 years ]
    Will be estimated using the product-limit method of Kaplan and Meier; medians and 95% confidence intervals will be computed.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   19 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients must have histologically or cytologically confirmed prostate cancer (CaP); CaP can be recurrent disease after definitive therapy (radical prostatectomy or radiation therapy) for localized CaP, or metastatic CaP
  • Patients must have CaP deemed to be castration-resistant by one or more of the following criteria (despite androgen deprivation when applicable):

    • Progression of unidimensionally measurable disease assessed within 42 days prior to initial administration of drug
    • Progression of evaluable but not measurable disease assessed within 42 days prior to initial administration of drug for PSA evaluation and for imaging studies (e.g, bone scans)
    • Rising PSA, defined as at least two consecutive rises in PSA to be documented over a reference value (measure 1); the first rising PSA (measure 2) should be taken at least 7 days after the reference value; a third confirmatory PSA measure (2nd beyond the reference level) should be greater than the second measure, and it must be obtained at least 7 days after the 2nd measure; if this is not the case, a fourth PSA measurement is required to be taken and be greater than the second measure
  • Measurable disease is not required

    • Patients who have measurable disease must have had X-rays, scans or physical examinations used for tumor measurement completed within 28 days prior to initial administration of drug
    • Patients must have non-measurable disease (such as nuclear medicine bone scans) and non-target lesions (such as PSA level) assessed within 28 days prior to initial administration of drug
    • Soft tissue disease that has been radiated within two months prior to registration is not assessable as measurable disease; soft tissue disease that has been radiated two or more months prior to registration is assessable as measurable disease provided that the lesion has progressed following radiation; as the biology of previously irradiated tumors may be different from non-irradiated tumors, patients must have at least one measurable lesion outside the previously irradiated region in order to be considered to have measurable disease
    • If PSA is the only indicator of disease and patients do not have any metastatic disease, PSA value must be 5.0 or higher
  • Patients must have been surgically or medically castrated; if the method of castration was luteinizing hormone-releasing hormone (LHRH) agonists (leuprolide or goserelin) or antagonists (degarelix), then the patient must be willing to continue the use of LHRH agonists or antagonists; serum testosterone must be at castration levels (< 50 ng/dL) within 3 months prior to registration
  • Eastern Cooperative Oncology Group (ECOG) performance status =< 2 (Karnofsky >= 60%)
  • Life expectancy of greater than 6 months
  • Leukocytes >= 3,000/mcL
  • Absolute neutrophil count >= 1,500/mcL
  • Platelets >= 100,000/mcL
  • Total bilirubin within normal institutional limits
  • Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase [SGPT]) =< 1.5 x institutional upper limit of normal
  • Creatinine =< 1.5 x institutional upper limit of normal
  • Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 4 months after completion of enzalutamide administration
  • Ability to understand and the willingness to sign a written informed consent document

Exclusion Criteria:

  • Patients who have had chemotherapy or radiotherapy within 4 weeks prior to entering the study or those who have not recovered from adverse events due to agents administered more than 4 weeks earlier
  • Patients who are receiving any other investigational agents within the preceding 4 weeks
  • Patients on herbs or other alternative medicines for the treatment of prostate cancer, including but not limited to saw palmetto, PC-SPES
  • Patient has received enzalutamide or ketoconazole for the treatment of prostate cancer; however, previous treatment with other hormonal therapy (bicalutamide, abiraterone, flutamide, and nilutamide) or chemotherapy (docetaxel, cabazitaxel, or mitoxantrone) is allowed
  • Other malignancies within the past 3 years except for adequately treated basal or squamous cell carcinomas of the skin or other stage 0 or I cancers
  • Patients with known brain metastases should be excluded from this clinical trial because of their poor prognosis and because they often develop progressive neurologic dysfunction that would confound the evaluation of neurologic and other adverse events
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to enzalutamide or indomethacin
  • 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
  • Human immunodeficiency virus (HIV)-positive patients on combination antiretroviral therapy are ineligible
  • Impairment of gastrointestinal function or gastrointestinal disease that may significantly alter the absorption of drugs (e.g., ulcerative disease, uncontrolled nausea, vomiting, diarrhea, malabsorption syndrome, or small bowel resection)
  • Patients with an active bleeding diathesis
  • History of noncompliance to medical regimens
  • Patients unwilling to or unable to comply with the protocol
  • Patients with symptomatic metastatic prostate cancer such as moderate to severe pain, impaired organ function, or spinal cord compression will be excluded from this study unless these issues have been taken care of
  • Patients with a history of seizure disorder, underlying brain injury with loss of consciousness, transient ischemic attack within the past 12 months, cerebral vascular accident, brain metastases, brain arteriovenous malformation
  • Patients with a history of peptic ulcer disease or gastrointestinal bleeding

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02935205

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United States, California
University of California Davis Comprehensive Cancer Center Recruiting
Sacramento, California, United States, 95817
Contact: Chong-Xian Pan    916-734-3771   
Principal Investigator: Chong-Xian Pan         
Sponsors and Collaborators
Mamta Parikh
National Cancer Institute (NCI)
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Principal Investigator: Chong-Xian Pan University of California, Davis
Additional Information:
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Responsible Party: Mamta Parikh, Principal Investigator, University of California, Davis Identifier: NCT02935205    
Other Study ID Numbers: 949968
UCDCC#267 ( Other Identifier: UC Davis IRB )
UCDCC#267 ( Other Identifier: University of California Davis Comprehensive Cancer Center )
P30CA093373 ( U.S. NIH Grant/Contract )
NCI-2016-01479 ( Registry Identifier: CTRP (Clinical Trial Reporting Program) )
First Posted: October 17, 2016    Key Record Dates
Last Update Posted: June 30, 2022
Last Verified: June 2022
Additional relevant MeSH terms:
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Prostatic Neoplasms
Neoplasms, Glandular and Epithelial
Neoplasms by Histologic Type
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Prostatic Diseases
Anti-Inflammatory Agents, Non-Steroidal
Analgesics, Non-Narcotic
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Inflammatory Agents
Antirheumatic Agents
Gout Suppressants
Tocolytic Agents
Reproductive Control Agents
Cyclooxygenase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action