A Study of Sipuleucel-T With Administration of Enzalutamide in Men With Metastatic Castrate-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. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT01981122 |
Recruitment Status :
Completed
First Posted : November 11, 2013
Results First Posted : September 25, 2018
Last Update Posted : October 24, 2018
|
- Study Details
- Tabular View
- Study Results
- Disclaimer
- How to Read a Study Record
Condition or disease | Intervention/treatment | Phase |
---|---|---|
Metastatic Prostate Cancer | Biological: sipuleucel-T Drug: enzalutamide | Phase 2 |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 52 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | None (Open Label) |
Primary Purpose: | Basic Science |
Official Title: | A Randomized, Open-label, Phase 2 Study of Sipuleucel-T With Concurrent Versus Sequential Administration of Enzalutamide in Men With Metastatic Castrate-Resistant Prostate Cancer |
Actual Study Start Date : | September 2013 |
Actual Primary Completion Date : | June 30, 2017 |
Actual Study Completion Date : | June 30, 2017 |

Arm | Intervention/treatment |
---|---|
Experimental: Concurrent Arm
Subjects will receive sipuleucel-T concurrently with enzalutamide (160 mg orally once daily). Enzalutamide treatment will start 2 weeks prior to the first leukapheresis and continue for 52 weeks or until disease progression or unacceptable toxicity, whichever occurs first.
|
Biological: sipuleucel-T
Sipuleucel-T is an autologous cell product consisting of antigen presenting cells (APCs) loaded with PA2024, a recombinant fusion protein composed of prostatic acid phosphatase (PAP), linked to granulocyte-macrophage colony-stimulating factor (GM-CSF).
Other Names:
Drug: enzalutamide Enzalutamide is an androgen receptor inhibitor. It is indicated for the treatment of patients with mCRPC who have previously received docetaxel. The enzalutamide dose used in this study will be 160 mg orally once daily.
Other Name: Xtandi |
Experimental: Sequential Arm
Subjects will receive sipuleucel-T followed by enzalutamide (160 mg orally once daily). Enzalutamide treatment will start approximately 10 weeks after the first infusion of sipuleucel-T and continue for 52 weeks or until disease progression or unacceptable toxicity, whichever occurs first.
|
Biological: sipuleucel-T
Sipuleucel-T is an autologous cell product consisting of antigen presenting cells (APCs) loaded with PA2024, a recombinant fusion protein composed of prostatic acid phosphatase (PAP), linked to granulocyte-macrophage colony-stimulating factor (GM-CSF).
Other Names:
Drug: enzalutamide Enzalutamide is an androgen receptor inhibitor. It is indicated for the treatment of patients with mCRPC who have previously received docetaxel. The enzalutamide dose used in this study will be 160 mg orally once daily.
Other Name: Xtandi |
- To Evaluate Peripheral PA2024-specific T Cell Proliferation Response to Sipuleucel-T Over Time Via a T Cell Stimulation Index (SI). [ Time Frame: Each patient was followed for up to 52 weeks after the first dose of sipuleucel-T. Immune sample draws during the treatment period (Week 0 through Week 4) were to be performed at the patient's pre-leukapheresis visits (Pre-Leuk 2 and Pre-Leuk 3). ]PA2024-specific T cell proliferation responses over time will be compared between the concurrent arm and sequential arm using a repeated measurement mixed model analysis. The unit of analysis for the T cell proliferation data is the stimulation index, defined as the median 3H uptake of 3 wells exposed to antigen divided by the median 3H thymidine uptake of 3 wells exposed to media. The stimulation index will be log-transformed prior to analysis.

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.
Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | Male |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Written informed consent provided prior to the initiation of study procedures.
- Age ≥ 18 years.
- Histologically documented adenocarcinoma prostate cancer confirmed by a pathology report from prostate biopsy or a radical prostatectomy specimen.
- Metastatic disease as evidenced by bone metastasis or lymph node metastasis.
-
Castrate-resistant prostate cancer as demonstrated by one of the following:
- Prostate specific antigen progression.
- Progression of measurable disease.
- Progression of non-measurable disease by soft tissue disease or bone disease.
- Castration levels of testosterone (≤ 50 ng/dL) achieved via medical or surgical castration.
- Serum PSA (Prostate specific antigen) ≥ 2.0 ng/mL.
- Screening ECOG (The Eastern Cooperative Oncology Group )performance status ≤ 1
- Adequate screening hematologic, renal, and liver function as evidenced by laboratory test results obtained ≤ 28 days prior to registration.
- Negative serology test for human immunodeficiency virus 1 and 2.
- Resides within driving distance (round trip within 1 day) of the clinical trial site for the duration of the active phase.
Exclusion Criteria:
- The presence of known lung, liver, or brain metastases, malignant pleural effusions, or malignant ascites.
- Spinal cord compression, imminent long bone fracture, or any other condition that is likely to require radiation therapy and/or steroids for pain control during the active phase.
- History of stage 3 or greater cancer, excluding prostate cancer. Basal or squamous cell skin cancers must have been adequately treated and the subject must be disease free at the time of registration. Subjects with a history of stage 1 or 2 cancer must have been adequately treated and been disease free for ≥ 3 years at the time of registration.
- History of seizures or of predisposing factors for seizures.
- Child-Pugh Class C hepatic insufficiency.
- History of allergic reactions attributed to compounds of similar chemical or biologic composition to sipuleucel-T, GM-CSF or granulocyte colony stimulating factor (G-CSF).
- Previous treatment with sipuleucel-T or enrollment in a sipuleucel-T trial, regardless of whether the subject received sipuleucel-T or control.
- Previous treatment with enzalutamide.
- Previous treatment with abiraterone acetate.
- Previous treatment with ipilimumab.
- Previous treatment with ketoconazole other than topical use or for treatment of infections (e.g., oral thrush); most recent use must have been ≥ 7 days prior to registration.
- Previous treatment with any immunotherapy or investigational vaccine.
- A requirement for ongoing systemic immunosuppressive therapy. Use of inhaled, intranasal, intra-articular, and topical steroids is allowed. Oral or IV steroids to prevent or treat IV contrast reactions are allowed.
- Previous treatment with chemotherapy for mCRPC, or chemotherapy for any reason ≤ 2 years prior to registration.
- Use of concomitant medications that may lower the seizure threshold or the use of antiseizure medications ≤ 1 year prior to registration.
- Received GM-CSF or G-CSF ≤ 90 days prior to registration.
- Ongoing non-steroidal antiandrogen withdrawal response.
-
Any of the following medications or interventions ≤ 28 days prior to registration:
- Radiation therapy, either via external beam or brachytherapy.
- Any systemic steroid. Use of inhaled, intra-nasal, intra-articular, and topical steroids is allowed. Oral or IV steroids to prevent or treat IV contrast reactions are allowed.
- Any systemic therapy for prostate cancer, except for ADT (Androgen deprivation therapy).
- Any investigational product for prostate cancer.
- Major surgery requiring general anesthesia, with the exception of placement of central venous catheters.
- Inducers and inhibitors of cytochrome P450 (CYP) enzyme CYP2C8 (gemfibrozil and rifampin).
- Medications that are metabolized by CYP3A4, CYP2C9, or CYP2C19 that have a narrow therapeutic index.
- Inducers of CYP3A4 (including but not limited to phenytoin, carbamazepine, rifampin, rifabutin, rifapentine, and phenobarbital).
- A requirement for treatment with opioid analgesics for cancer-related pain ≤ 21 days prior to registration.
- An active infection requiring parenteral antibiotic therapy or causing fever (temperature > 100.5˚ F or 38.1˚ C) ≤ 1 week prior to registration.
- Any medical intervention, any other condition, or any other circumstance which could compromise adherence with study requirements or otherwise compromise the study's objectives.

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 ClinicalTrials.gov identifier (NCT number): NCT01981122

Study Director: | Bruce Brown, MD | Dendreon Pharmaceuticals LLC, |
Documents provided by Dendreon:
Responsible Party: | Dendreon |
ClinicalTrials.gov Identifier: | NCT01981122 History of Changes |
Other Study ID Numbers: |
P12-2 |
First Posted: | November 11, 2013 Key Record Dates |
Results First Posted: | September 25, 2018 |
Last Update Posted: | October 24, 2018 |
Last Verified: | September 2018 |
Additional relevant MeSH terms:
Prostatic Neoplasms Genital Neoplasms, Male Urogenital Neoplasms Neoplasms by Site |
Neoplasms Genital Diseases, Male Prostatic Diseases |