Last updated on February 2018

A Study to Evaluate Serum Testosterone Levels in Patients With Metastatic Castration-Resistant Prostate Cancer


Are you eligible to participate in this study?

You may be eligible for this study if you meet the following criteria:

  • Conditions: Malignant neoplasm of prostate
  • Age: Between 18 - 100 Years
  • Gender: Male

Inclusion Criteria:

  1. Written informed consent obtained prior to any study-related procedure being performed
  2. Male subjects at least 18 years of age or older at time of consent
  3. Pathologically confirmed adenocarcinoma of the prostate
  4. Ongoing therapy with a GnRH agonist or antagonist AND serum testosterone level <50 ng/dL at screening
  5. Metastatic disease documented by computed tomography (CT)/ magnetic resonance imaging (MRI) or bone scan. Imaging obtained within 42 days prior to the start of study medication will be accepted.
  6. Meeting disease progression according to the recommendations of the prostate cancer working group 2 by one of the following criteria:
    • Two rises of PSA (taken a minimum of 1 week apart) from a baseline measurement of at least 2 ng/mL,
    • Imaging progression (CT/MRI) by RECIST criteria
    • Nuclear scan progression by new lesion.
  7. Discontinuation of flutamide or nilutamide, and other anti-androgens at least 4 weeks prior to the start of study medication; discontinuation of bicalutamide at least 6 weeks prior to start of study medication.
  8. Discontinuation of Radiotherapy > 4 weeks prior to start of study medication.
  9. ECOG performance status of 0-1 at screening
  10. Screening blood counts of the following:
    • Absolute neutrophil count > 1500/L
    • Platelets > 100,000/L
    • Hemoglobin > 9 g/dL
  11. Screening chemistry values of the following:
    • ALT and AST < 2.5 x ULN
    • Total bilirubin < 1.5 x ULN
    • Creatinine< 1.5 x ULN
    • Albumin > 3.0 g/dL
  12. Potassium > 3.5 mmol/L
  13. Life expectancy of at least 6 months at screening
  14. Subject is willing and able to comply with all protocol requirements assessments
  15. Agrees to protocol-defined use of effective contraception.

Exclusion Criteria:

  1. History of impaired pituitary or adrenal gland function
  2. Prior therapy with abiraterone acetate, orteronel, ketoconazole or any other CYP17 inhibitor
  3. Prior therapy with enzalutamide
  4. Prior use of experimental androgen receptor antagonist
  5. Previous exposure to Ra-223:Xofigo
  6. Previous chemotherapy
  7. Initiation of bisphosphonate or denosumab therapy within 30 days prior to the start of study medication. Patients who are on a stable dose of these medications for at least 30 days at the time of starting study drug are eligible.
  8. Therapy with estrogen within 30 days prior to the start of study medication
  9. Use of systemic glucocorticoids equivalent to > 10 mg of prednisone daily; patients who have discontinued or have reduced dose to < 10 mg prednisone within 14 days prior to the start of study medication will be eligible
  10. Prior use of any herbal products that may decrease PSA levels (eg., saw palmetto) within 30 days of start of study medication
  11. Known metastases to the brain or CNS involvement
  12. History of other malignancy within the previous 2 years
  13. Major surgery within 30 days prior to the start of study medication
  14. Blood transfusion within 30 days of screening
  15. Serious, persistent infection within 14 days of the start of study medication
  16. Persistent pain that requires the use of a narcotic analgesic
  17. Known gastrointestinal disease or condition that may impair absorption
  18. Treatment with any investigational drug within 4 weeks prior to Day -1 of the study.
  19. Known history of human immunodeficiency virus (HIV) or seropositive test for hepatitis C virus or hepatitis B virus
  20. Have poorly controlled diabetes.
  21. Uncontrolled hypertension
  22. History of New York Heart Association (NYHA) class III or IV heart failure
  23. Serious concurrent illness, including psychiatric illness, that would interfere with study participation
  24. Inability to swallow tablets whole
  25. Known hypersensitivity to any excipients in study medications
  26. Moderate to severe hepatic impairment (Child-Pugh Classes B and C)

Recruitment Status: Open


Brief Description Eligibility Contact Research Team


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