Castration Resistant Metastatic Prostate CancerPhase 2NCT04363164
Sequential Testosterone and Enzalutamide Prevents Unfavorable Progression
A Phase 2 study testing Testosterone cypionate, Enzalutamide and Testosterone enanthate in people with Castration Resistant Metastatic Prostate Cancer, run by Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins at 6 sites in United States.
Trial summary
Asymptomatic men without pain due to prostate cancer progressing with metastatic CRPC after treatment with combination or sequential ADT + Abi will be treated on a randomized, open label study to determine if sequential treatment with high dose T and Enza will improve primary and secondary objectives vs. Read more about this study
- Who is it for?
- Ages 18 to 90 years, men only
- Conditions the study is for
- Castration Resistant Metastatic Prostate Cancer
- What is being tested?
- Testosterone cypionate, Enzalutamide and Testosterone enanthate
- Type of treatment
- Pill or oral medicine, Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 150 participants
- Where
- 6 sitesUnited States
- Study dates
- 19 Aug 2020to Jul 2028
- Phase
- Phase 2
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 90 years
- Men only
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- ECOG Performance status ≤2.
- Age ≥18 years.
- Histologically-confirmed adenocarcinoma of the prostate.
- Treated with continuous androgen ablative therapy (either surgical castration or LHRH agonist/antagonist).
- Documented castrate level of serum testosterone (<50 ng/dl).
- Metastatic disease radiographically documented by CT or bone scan.
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- Must have had disease progression while on combination of abiraterone acetate plus ADT either given concurrently or sequentially based on:
- PSA progression defined as an increase in PSA, as determined by 2 separate measurements taken at least 1 week apart And/ Or
- Radiographic disease progression, based on RECIST 1.1 in patients with measurable soft tissue lesions or PCWG3 for patients with bone disease
- Screening PSA must be ≥ 1.0 ng/mL.
- Patients with soft tissue lesion amenable to biopsy must agree to biopsy collection pre-treatment and at a defined point on treatment to perform tumor tissue analysis.
- No prior treatment with enzalutamide, apalutamide, darolutamide, or other investigational AR targeted treatment is allowed.
- Prior treatment with testosterone is allowed.
- Prior treatment with one chemotherapy regimen with docetaxel (≤ 6 doses) for hormonesensitive prostate cancer is allowed.
- Prior treatment with Provenge vaccine and 223Radium (Xofigo) is allowed if >4 weeks from last dose.
- Patients must be withdrawn from abiraterone for ≥ 2 weeks.
- Attempts must be made to wean patients off prednisone prior to starting therapy. Patients who cannot be weaned due to symptoms may continue on lowest dose of prednisone achieved during weaning period.
- Acceptable liver function:
- Bilirubin < 2.5 times institutional upper limit of normal (ULN)
- AST (SGOT) and ALT (SGPT) < 2.5 times ULN
- Acceptable renal function:
- Serum creatinine < 2.5 times ULN
- Acceptable hematologic status:
- Absolute neutrophil count (ANC) ≥ 1500 cells/mm3 (1.5 ×109/L)
- Platelet count ≥ 100,000 platelet/mm3 (100 ×109/L)
- Hemoglobin ≥ 8 g/dL.
- At least 4 weeks since prior radiation or chemotherapy.
- Ability to understand and willingness to sign a written informed consent document.
Who cannot join
- Pain due to metastatic prostate cancer requiring treatment intervention with pain medication.
- ECOG Performance status ≥3
- Prior treatment with enzalutamide is prohibited.
- Prior chemotherapy with docetaxel or cabazitaxel for castration resistant prostate cancer is prohibited.
- Requires urinary self-catheterization for voiding due to obstruction secondary to prostatic enlargement well documented to be due to prostate cancer or benign prostatic hyperplasia (BPH). Patients with indwelling Foley or suprapubic catheter for obstructive symptoms are eligible.
- Evidence of disease in sites or extent that, in the opinion of the investigator, would put the patient at risk from therapy with testosterone (e.g. femoral metastases with concern over fracture risk, severe and extensive spinal metastases with concern over spinal cord compression, extensive liver metastases).
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- Evidence of serious and/or unstable pre-existing medical, psychiatric or other condition (including laboratory abnormalities) that could interfere with patient safety or provision of informed consent to participate in this study.
- Active uncontrolled infection, including known history of HIV/AIDS or hepatitis B or C.
- Any condition or mental impairment that may compromise the ability to give informed consent, patient's safety or compliance with study requirements as determined by the investigator.
- Patients receiving anticoagulation therapy with warfarin, rivaroxaban, or apixaban are not eligible for study. [Patients on enoxaparin eligible for study. Patients on warfarin, rivaroxaban,or apixaban, who can be transitioned to enoxaparin prior to starting study treatments will be eligible].
- Patients are excluded with prior history of a thromboembolic event within the last 12 months that are not being treated with systemic anticoagulation.
- Hematocrit >51%, untreated severe obstructive sleep apnea, uncontrolled or poorly controlled heart failure [per Endocrine Society Clinical Practice Guidelines (34)]
- Patients allergic to sesame seed oil or cottonseed oil are excluded.
- Major surgery (eg, requiring general anesthesia) within 3 weeks before screening, or has not fully recovered from prior surgery (ie, unhealed wound). Note: subjects with planned surgical procedures to be conducted under local anesthesia may participate.
Trial locations and contacts
6 sites in 1 country. Contact the study team or a site near you to ask about taking part.
6 sites in 1 country
United States6 sites, 6 recruiting
- Recruiting
Johns Hopkins University/Sidney Kimmel Cancer Center
Baltimore, Maryland, 21287
Samuel R. Denmeade, 410-955-8875, denmesa@jhmi.edu
Samuel R. Denmeade
- Recruiting
Dana-Faber Cancer Institute
Boston, Massachusetts, 02215
Jacob Berchuck, MD, 919-452-4199, jacob_berchuck@dfci.harvard.edu
Jacob Berchuck, MD
- Recruiting
University of Minnesota
Minneapolis, Minnesota, 55455
Emmanuel Antonarakis, MD, anton401@umn.edu
Emmanuel Antonarakis
- Recruiting
University of Nebraska Medical Center
Omaha, Nebraska, 68198
Benjamin Teply, MD, ben.teply@unmc.edu
Benjamin Teply, MD
- Recruiting
University of California, San Diego (UCSD)
San Diego, California, 92037
Rana McKay, MD, rmckay@health.ucsd.edu
Rana McKay, MD
- Recruiting
University of Washington/Fred Hutchinson Cancer Center
Seattle, Washington, 98109
Michael Schweizer, MD, schweize@uw.edu
Michael Schweizer, MD
About this study
Official title: A Randomized Phase II Study Comparing Sequential High Dose Testosterone and Enzalutamide to Enzalutamide Alone in Asymptomatic Men With Castration Resistant Metastatic Prostate Cancer
Asymptomatic men without pain due to prostate cancer progressing with metastatic CRPC after treatment with combination or sequential ADT + Abi will be treated on a randomized, open label study to determine if sequential treatment with high dose T and Enza will improve primary and secondary objectives vs. continuous Enza as standard therapy.
Read the detailed description
Eligible patients are those who have progressive disease after treatment with Abi either in combination with ADT as initial therapy or as second-line therapy after development of resistance to primary ADT. Patients will continue on ADT with LHRH agonist (i.e. Zoladex, Trelstar, Eligard or Lupron) or LHRH antagonist (Degarelix) if not surgically castrated throughout the duration of the study to inhibit endogenous testosterone production. Patients will be randomized 1:2:2 and stratified based on whether they received Abi in combination with ADT or in sequence after progression on ADT and based on duration of response to Abi (<6 or ≥ 6 months).
Patients randomized to Arm A will receive continuous therapy with standard dose Enza (160 mg po q day).
Patients randomized to Arm B will receive Sequential Testosterone and Enzalutamide (STE). Patients in Arm B will receive intramuscular injection with testosterone cypionate (T) at a dose of 400 mg every 28 days x 2 (i.e. cycle 1). This dose was selected based on data demonstrating that it produces an initial high dose serum level of T (i.e. > 1500 ng/dL or 3-10 times normal level) with eugonadal levels achieved at the end of two weeks and near castrate levels after 28 days. On Day 1 of cycle 2, patients will stop testosterone and begin enzalutamide 160 mg po q day for 56 days. Each cycle is 56 days. On Day 1 of cycle 3, patient will not take enzalutamide and will again receive injection of testosterone. Patients will continue to alternate one cycle of testosterone (2 injections) with one cycle of 56 days of enzalutamide.
Patients randomized to Arm C will receive Variable Sequential Testosterone and Enzalutamide (VSTE). Patients in Arm C will receive intramuscular injection with testosterone cypionate (T) at an FDA-approved dose of 400 mg every 28 days x 2 injections per cycle. Patients will remain on high dose T for at least one cycle. Each cycle is 56 days. Patients with PSA progression (≥25% increase in PSA from baseline PSA on BAT cycle) will stop T injection and begin Enzalutamide. Patients on T with initial with declining PSA decline PSA will remain on high dose T for additional cycles of 2 injections until PSA progression occurs (≥25% increase in PSA from PSA nadir on current BAT cycle)based on PCWG3 criteria. Patients with PSA progression (≥25% increase in PSA from baseline) will stop T injection. These patients will then be started on Enzalutamide. Patients with PSA progression (≥25% increase in PSA from baseline on enzalutamide cycle) will stop Enzalutamide and will restart injections of T with 2 injections/cycle. Patients on enzalutamide with initial PSA decline after one 56- day cycle will continue on Enzalutamide until PSA progression occurs (≥25% increase in PSA from PSA nadir on current Enzalutamide cycle). . Patients with PSA progression (≥25% increase in PSA from baseline) will stop Enzalutamide and will restart injections of T with 2 injections/cycle. These cycles of switching between T and Enza with onset of PSA progression will continue until clinical and/or radiographic progression occurs.
Patients will have prostate-specific antigen (PSA) level and symptoms assessment checked every cycle. Every 2 cycles (~4 months) patients will have repeat bone/CT scans to evaluate treatment response status. On CT scan, radiographic progression will be defined by RECIST criteria (i.e. >20% increase in the sum of target lesions). On bone scan, radiographic progression will be defined by PCWG3 criteria as ≥ 2 new bone lesions.
Patients with PSA progression but with disease response or stable disease on imaging studies will remain on study until clinical or radiographic progression criteria are met. Patients with radiographic disease progression will stop treatment and come off study. Patients with clinical progression due to pain flare after first two injection of testosterone can remain on study. If pain persists after first cycle of enzalutamide, patients will stop treatment and come off study. If pain resolves on enzalutamide, but returns with next or subsequent cycles of testosterone, patients will stop treatment and come off study.
- Being tested
- Testosterone cypionate, Enzalutamide, Testosterone enanthate
- Keywords
- Testosterone, Enzalutamide, Androgen Deprivation Therapy (ADT)
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Testosterone cypionateDrug
Also called Depo-Testosterone Injection
Depo-Testosterone Injection, for intramuscular injection, contains testosterone cypionate which is the oil-soluble of the androgenic hormone testosterone. Testosterone cypionate is a white or creamy white crystalline powder, odorless or nearly so and stable in air. Depo-Testosterone Injection is available in two strengths, 100 mg/mL and 200 mg/mL testosterone cypionate.
EnzalutamideDrug
Enzalutamide is a white crystalline non-hygroscopic solid. It is practically insoluble in water. Enzalutamide is provided as liquid-filled soft gelatin capsules for oral administration. Each capsule contains 40 mg of enzalutamide as a solution in caprylocaproyl polyoxylglycerides. The inactive ingredients are caprylocaproyl polyoxylglycerides, butylated hydroxyanisole, butylated hydroxytoluene, gelatin, sorbitol sorbitan solution, glycerin, purified water, titanium dioxide, and black iron oxide.
Testosterone enanthateDrug
Also called Delatestryl
Testosterone Enanthate Injection, for intramuscular injection, contains testosterone enanthate which is the oil-soluble ester of the androgenic hormone testosterone. Enanthate Injection is available as a colorless to pale yellow solution. Each mL contains 200 mg testosterone enanthate in sesame oil with 5 mg chlorobutanol as a preservative.
| Study group | Role | What they receive |
|---|---|---|
| Arm A: Enzalutamide | Experimental | Patients randomized to Arm A will receive continuous therapy with standard dose Enzalutamide (160 mg oral daily). Receives: Drug: Enzalutamide |
| Arm B: Sequential Testosterone and Enzalutamide | Experimental | Patients in Arm B will receive intramuscular injection with testosterone cypionate (T) at a dose of 400 mg every 28 days x 2 (i.e. cycle 1). On Day 1 of cycle 2, patients will stop testosterone and begin enzalutamide 160 mg po q day for 56 days. Each cycle is 56 days. On Day 1 of cycle 3, patient will not take enzalutamide and will again receive injection of testosterone. Patients will continue to alternate one cycle of testosterone (2 injections) with one cycle of 56 days of enzalutamide. Receives: Drug: Testosterone cypionate; Drug: Enzalutamide; Drug: Testosterone enanthate |
| Arm C: Variable Sequential Testosterone and Enzalutamide | Experimental | Patients in Arm C will receive intramuscular injection with testosterone cypionate (T) at a dose of 400 mg every 28 days x 2 injections per cycle. Each cycle is 56 days. Patients with PSA progression will stop T injection and begin Enzalutamide. Patients on T with initial PSA decline will remain on high dose T for additional cycles of 2 injections until PSA progression occurs (≥25% increase in PSA from PSA nadir on current BAT cycle). These patients will then be started on Enzalutamide. Patients with PSA progression will stop Enzalutamide and will restart injections of T with 2 injections/cycle. Patients on enzalutamide with initial PSA decline after one 56-day cycle will continue on Enzalutamide until PSA progression occurs (≥25% increase in PSA from PSA nadir on current Enzalutamide cycle). These cycles of switching between T and Enza with onset of PSA progression will continue until clinical and/or radiographic progression occurs. Receives: Drug: Testosterone cypionate; Drug: Enzalutamide; Drug: Testosterone enanthate |
What is being measured
The primary outcome is the main question the study is designed to answer.
Clinical or Radiographic Progression free survival
Time from the date of the randomization to the date of first documented radiological progression per RECIST 1.1 for soft tissue or PCWG3 for bone lesions, or clinical progression or death, whichever occurs first.
Measured: Up to 2 years
Secondary outcomes (7)
Safety of cyclical parenteral testosterone as assessed by the revised National Cancer Institute Common Toxicity Criteria
Safety of cyclical parenteral testosterone in asymptomatic men with recurrent castrate resistant prostate cancer. Safety will be evaluated by adverse events as assessed by the revised National Cancer Institute Common Toxicity Criteria (NCI CTC), version 4.0
Measured: Up to 2 years
Prostate-Specific Antigen Response Rate
Number of participants achieving a Prostate-Specific Antigen decline ≥ 50% according to Prostate Cancer Working Group (PCWG2) criteria.
Measured: Up to 2 years
Objective Response Rate as Determined by RECIST
Number of participants with partial (PR) or complete response (CR) as defined by response evaluation criteria in solid tumors (RECIST), where CR is a disappearance of all target lesions and PR is ≥30% reduction in the sum of the longest diameter of target lesions.
Measured: Up to 2 years
Quality of Life as Assessed by FACIT Fatigue Scale
The Functional Assessment of Chronic Illness Therapy - Fatigue has a score range of 0-52 with higher scores indicating better quality of life.
Measured: Up to 1 year
Quality of Life as Assessed by Short Form 36
All questions are scored on a scale from 0 to 100. The total score from all of the questions answered is divided by the total number of the questions answered yielding a global score from 0-100 with 100 representing the highest level of functioning possible.
Measured: Up to 1 year
Time to Overall Survival
Time to overall survival will be calculated as months from date of off treatment up to 3 years.
Measured: Up to 3 years
Radiographic Progression free survival
Number of months until 20% increase in the sum of target lesions on CT scans or greater than 2 new bone lesions on bone scan.
Measured: Up to 2 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted27 Apr 2020
- Study start19 Aug 2020
- Primary completionJul 2027 (estimated)
- Study completionJul 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Castration Resistant Metastatic Prostate CancerStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 150 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
- Sponsor type
- University, hospital or other
- Collaborators
- United States Department of Defense
- Responsible party
- Sponsor
- Investigators
- Samuel Denmeade, MD, Principal investigator, SKCCC at Johns Hopkins
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04363164
- Sponsor's protocol ID
- J2060sIRB
- Other IDs
- IRB00312725
- Status last verified
- Jul 2026
- First submitted
- 23 Apr 2020
- Last updated
- 17 Jul 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 17 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Randomized Phase II Study Comparing Sequential High Dose Testosterone and Enzalutamide to Enzalutamide Alone in Asymptomatic Men With Castration Resistant Metastatic Prostate Cancer
- ClinicalTrials.gov ID
- NCT04363164
- Acronym / sponsor ID
- J2060sIRB
- Keywords
- Testosterone, Enzalutamide, Androgen Deprivation Therapy (ADT)
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 150 participants (estimated)
- Lead sponsor
- Sidney Kimmel Comprehensive Cancer Center at Johns HopkinsUniversity, hospital or other
- Collaborators
- United States Department of Defense
- Study start
- 19 Aug 2020 (actual)
- Primary completion
- Jul 2027 (estimated)
- Study completion
- Jul 2028 (estimated)
- First posted
- 27 Apr 2020 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Asymptomatic men without pain due to prostate cancer progressing with metastatic CRPC after treatment with combination or sequential ADT + Abi will be treated on a randomized, open label study to determine if sequential treatment with high dose T and Enza will improve primary and secondary objectives vs. continuous Enza as standard therapy.
Detailed description
Eligible patients are those who have progressive disease after treatment with Abi either in combination with ADT as initial therapy or as second-line therapy after development of resistance to primary ADT. Patients will continue on ADT with LHRH agonist (i.e. Zoladex, Trelstar, Eligard or Lupron) or LHRH antagonist (Degarelix) if not surgically castrated throughout the duration of the study to inhibit endogenous testosterone production. Patients will be randomized 1:2:2 and stratified based on whether they received Abi in combination with ADT or in sequence after progression on ADT and based on duration of response to Abi (<6 or ≥ 6 months).
Patients randomized to Arm A will receive continuous therapy with standard dose Enza (160 mg po q day).
Patients randomized to Arm B will receive Sequential Testosterone and Enzalutamide (STE). Patients in Arm B will receive intramuscular injection with testosterone cypionate (T) at a dose of 400 mg every 28 days x 2 (i.e. cycle 1). This dose was selected based on data demonstrating that it produces an initial high dose serum level of T (i.e. > 1500 ng/dL or 3-10 times normal level) with eugonadal levels achieved at the end of two weeks and near castrate levels after 28 days. On Day 1 of cycle 2, patients will stop testosterone and begin enzalutamide 160 mg po q day for 56 days. Each cycle is 56 days. On Day 1 of cycle 3, patient will not take enzalutamide and will again receive injection of testosterone. Patients will continue to alternate one cycle of testosterone (2 injections) with one cycle of 56 days of enzalutamide.
Patients randomized to Arm C will receive Variable Sequential Testosterone and Enzalutamide (VSTE). Patients in Arm C will receive intramuscular injection with testosterone cypionate (T) at an FDA-approved dose of 400 mg every 28 days x 2 injections per cycle. Patients will remain on high dose T for at least one cycle. Each cycle is 56 days. Patients with PSA progression (≥25% increase in PSA from baseline PSA on BAT cycle) will stop T injection and begin Enzalutamide. Patients on T with initial with declining PSA decline PSA will remain on high dose T for additional cycles of 2 injections until PSA progression occurs (≥25% increase in PSA from PSA nadir on current BAT cycle)based on PCWG3 criteria. Patients with PSA progression (≥25% increase in PSA from baseline) will stop T injection. These patients will then be started on Enzalutamide. Patients with PSA progression (≥25% increase in PSA from baseline on enzalutamide cycle) will stop Enzalutamide and will restart injections of T with 2 injections/cycle. Patients on enzalutamide with initial PSA decline after one 56- day cycle will continue on Enzalutamide until PSA progression occurs (≥25% increase in PSA from PSA nadir on current Enzalutamide cycle). . Patients with PSA progression (≥25% increase in PSA from baseline) will stop Enzalutamide and will restart injections of T with 2 injections/cycle. These cycles of switching between T and Enza with onset of PSA progression will continue until clinical and/or radiographic progression occurs.
Patients will have prostate-specific antigen (PSA) level and symptoms assessment checked every cycle. Every 2 cycles (~4 months) patients will have repeat bone/CT scans to evaluate treatment response status. On CT scan, radiographic progression will be defined by RECIST criteria (i.e. >20% increase in the sum of target lesions). On bone scan, radiographic progression will be defined by PCWG3 criteria as ≥ 2 new bone lesions.
Patients with PSA progression but with disease response or stable disease on imaging studies will remain on study until clinical or radiographic progression criteria are met. Patients with radiographic disease progression will stop treatment and come off study. Patients with clinical progression due to pain flare after first two injection of testosterone can remain on study. If pain persists after first cycle of enzalutamide, patients will stop treatment and come off study. If pain resolves on enzalutamide, but returns with next or subsequent cycles of testosterone, patients will stop treatment and come off study.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Arm A: Enzalutamide | Experimental | Drug: EnzalutamidePatients randomized to Arm A will receive continuous therapy with standard dose Enzalutamide (160 mg oral daily). |
| Arm B: Sequential Testosterone and Enzalutamide | Experimental | Drug: Testosterone cypionate, Drug: Enzalutamide, Drug: Testosterone enanthatePatients in Arm B will receive intramuscular injection with testosterone cypionate (T) at a dose of 400 mg every 28 days x 2 (i.e. cycle 1). On Day 1 of cycle 2, patients will stop testosterone and begin enzalutamide 160 mg po q day for 56 days. Each cycle is 56 days. On Day 1 of cycle 3, patient will not take enzalutamide and will again receive injection of testosterone. Patients will continue to alternate one cycle of testosterone (2 injections) with one cycle of 56 days of enzalutamide. |
| Arm C: Variable Sequential Testosterone and Enzalutamide | Experimental | Drug: Testosterone cypionate, Drug: Enzalutamide, Drug: Testosterone enanthatePatients in Arm C will receive intramuscular injection with testosterone cypionate (T) at a dose of 400 mg every 28 days x 2 injections per cycle. Each cycle is 56 days. Patients with PSA progression will stop T injection and begin Enzalutamide. Patients on T with initial PSA decline will remain on high dose T for additional cycles of 2 injections until PSA progression occurs (≥25% increase in PSA from PSA nadir on current BAT cycle). These patients will then be started on Enzalutamide. Patients with PSA progression will stop Enzalutamide and will restart injections of T with 2 injections/cycle. Patients on enzalutamide with initial PSA decline after one 56-day cycle will continue on Enzalutamide until PSA progression occurs (≥25% increase in PSA from PSA nadir on current Enzalutamide cycle). These cycles of switching between T and Enza with onset of PSA progression will continue until clinical and/or radiographic progression occurs. |
Who may qualify
- Ages
- 18 to 90 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (28 listed)
- ECOG Performance status ≤2.
- Age ≥18 years.
- Histologically-confirmed adenocarcinoma of the prostate.
- Treated with continuous androgen ablative therapy (either surgical castration or LHRH agonist/antagonist).
- Documented castrate level of serum testosterone (<50 ng/dl).
Key exclusion criteria (14 listed)
- Pain due to metastatic prostate cancer requiring treatment intervention with pain medication.
- ECOG Performance status ≥3
- Prior treatment with enzalutamide is prohibited.
- Prior chemotherapy with docetaxel or cabazitaxel for castration resistant prostate cancer is prohibited.
- Requires urinary self-catheterization for voiding due to obstruction secondary to prostatic enlargement well documented to be due to prostate cancer or benign prostatic hyperplasia (BPH). Patients with indwelling Foley or suprapubic catheter for obstructive symptoms are eligible.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Testosterone cypionateAlso: Depo-Testosterone InjectionDepo-Testosterone Injection, for intramuscular injection, contains testosterone cypionate which is the oil-soluble of the androgenic hormone testosterone. Testosterone cypionate is a white or creamy white crystalline powder, odorless or nearly so and stable in air. Depo-Testosterone Injection is available in two strengths, 100 mg/mL and 200 mg/mL testosterone cypionate. | Drug | Arm B: Sequential Testosterone and Enzalutamide, Arm C: Variable Sequential Testosterone and Enzalutamide |
| EnzalutamideEnzalutamide is a white crystalline non-hygroscopic solid. It is practically insoluble in water. Enzalutamide is provided as liquid-filled soft gelatin capsules for oral administration. Each capsule contains 40 mg of enzalutamide as a solution in caprylocaproyl polyoxylglycerides. The inactive ingredients are caprylocaproyl polyoxylglycerides, butylated hydroxyanisole, butylated hydroxytoluene, gelatin, sorbitol sorbitan solution, glycerin, purified water, titanium dioxide, and black iron oxide. | Drug | Arm A: Enzalutamide, Arm B: Sequential Testosterone and Enzalutamide, Arm C: Variable Sequential Testosterone and Enzalutamide |
| Testosterone enanthateAlso: DelatestrylTestosterone Enanthate Injection, for intramuscular injection, contains testosterone enanthate which is the oil-soluble ester of the androgenic hormone testosterone. Enanthate Injection is available as a colorless to pale yellow solution. Each mL contains 200 mg testosterone enanthate in sesame oil with 5 mg chlorobutanol as a preservative. | Drug | Arm B: Sequential Testosterone and Enzalutamide, Arm C: Variable Sequential Testosterone and Enzalutamide |
Primary outcome
Clinical or Radiographic Progression free survival
Time frame: Up to 2 years
Time from the date of the randomization to the date of first documented radiological progression per RECIST 1.1 for soft tissue or PCWG3 for bone lesions, or clinical progression or death, whichever occurs first.
7 secondary outcomes
Safety of cyclical parenteral testosterone as assessed by the revised National Cancer Institute Common Toxicity Criteria
Time frame: Up to 2 years
Prostate-Specific Antigen Response Rate
Time frame: Up to 2 years
Objective Response Rate as Determined by RECIST
Time frame: Up to 2 years
Quality of Life as Assessed by FACIT Fatigue Scale
Time frame: Up to 1 year
Quality of Life as Assessed by Short Form 36
Time frame: Up to 1 year
Time to Overall Survival
Time frame: Up to 3 years
Radiographic Progression free survival
Time frame: Up to 2 years
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 17 Jul 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Samuel Denmeade, MD principal investigator
SKCCC at Johns Hopkins
6 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Testosterone cypionate, Enzalutamide and Testosterone enanthate in people with Castration Resistant Metastatic Prostate Cancer, run by Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins at 6 sites in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 28 inclusion and 14 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 17 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 6 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact GU oncology (4109551239, ProstateCancerClinicalTrials@live.johnshopkins.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Clinical or Radiographic Progression free survival (time frame: Up to 2 years). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 Jul 2026.