High Dose Testosterone in Men With Advanced Prostate Cancer and Homologous Recombination Deficiency

Condition: Castration-resistant Prostate Cancer, Homologous Recombination Deficiency


  • Drug: Testosterone Enanthate

Purpose: The purpose of this study is to determine the efficacy of BAT in men with metastatic castrate-resistant prostate cancer (mCRPC) and homologous recombination deficiency (HRD). Bipolar androgen therapy will be administered to men confirmed to have HRD on tumour tissue and/or circulating tumour DNA analysis on pre-screening.

Study Type: Interventional

Clinical Trials Identifier NCT 8-digits: NCT03522064

Sponsor: St Vincent's Hospital, Sydney

Primary Outcome Measures:

  • Measure: PSA Response Rate
  • Time Frame: 1 year
  • Safety Issue:

Secondary Outcome Measures:

  • Measure: Time to PSA progression
  • Time Frame: 1 year
  • Safety Issue:
  • Measure: Quality of Life
  • Time Frame: 1 year
  • Safety Issue:
  • Measure: Radiological Response Rate
  • Time Frame: 1 year
  • Safety Issue:
  • Measure: Safety and Tolerability (Frequency of adverse events as assessed by NCI CTCAE v4.0)
  • Time Frame: 1 year
  • Safety Issue:

Estimated Enrollment: 30

Study Start Date: July 30, 2018

Phase: Phase 2


  • Age: minimum 18 Years maximum N/A
  • Gender: Male

Inclusion Criteria:

  1. Males with histologically confirmed adenocarcinoma of the prostate
  2. Confirmed HRD (Homologous recombination defect) in germline and/or somatic DNA analysis (tumour or blood), by a validated assay (see Appendix 1). Mutations in HR genes not listed in appendix 1 will be considered in literature suggests pathogenicity. A maximum of 10 uncharacterised or heterozygous mutations will be included.
  3. Age ≥ 18 years
  4. ECOG performance status ≤ 1
  5. Rising PSA confirmed on two sequential tests ≥1 week apart and a minimum value of 2 ug/L despite castrate levels of testosterone
  6. Serum testosterone < 1.7 nmol/L and on an LHRH agent or post orchidectomy ≥ 1 year.
  7. Washout of ≥ 4 weeks from prior line of treatment, radiotherapy or surgery (aside from LHRH agent)
  8. Adequate bone marrow function (platelets > 100 x 109/L, ANC > 1.5 x 109/L, Hb >100)
  9. Adequate liver function (ALT/AST < 1.5 x ULN, bilirubin < 2 x ULN)
  10. Adequate renal function (creatinine clearance > 50 ml/min)
  11. Adequate cardiac function and reserve after cardiology assessment
  12. Archived tissue sample available or willingness to undergo fresh biopsy
  13. Willing and able to comply with all study requirements, including treatment, timing and/or nature of required assessments
  14. Signed, written informed consent

Exclusion Criteria:

  1. Contraindications to investigational product
  2. Pain due to metastatic prostate cancer requiring opioid analgesics
  3. Evidence of disease progression in sites or extent that, in the opinion of the investigator, would put the patient at risk from testosterone therapy and its potential for initial tumour flare (eg: femoral metastasis at risk of fracture, ureteric obstruction due to nodal disease or cord compression due to spinal metastases).
  4. Previous treatment with platinum chemotherapy and/or a PARP inhibitor. However up to 8 men with prior treatment to these agents will be included as an exploratory cohort.
  5. Life expectancy of less than 3 months.
  6. Brain metastases or leptomeningeal disease
  7. History of thromboembolic event and not currently on anticoagulation
  8. Prior myocardial infarction or unstable angina within 2 years of study entry
  9. Haematocrit ≥ 50%, untreated severe obstructive sleep apnoea or poorly controlled heart failure (NYHA >1)
  10. History of another malignancy within 5 years prior to registration. Patients with a past history of adequately treated carcinoma-in-situ, basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or superficial transitional cell carcinoma of the bladder are eligible. Patients with a history of other malignancies are eligible if they have been continuously disease free for at least 5 years after definitive primary treatment.
  11. Concurrent illness, including severe infection that may jeopardize the ability of the patient to undergo the procedures outlined in this protocol with reasonable safety.
  12. Presence of any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow-up schedule, including alcohol dependence or drug abuse.


  • Robert Kent
  • +61293555611


  • Kinghorn Cancer Centre, St. Vincent's Hospital
  • Sydney New South Wales 2010 Australia

View trial on ClinicalTrials.gov


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