A multicenter, open-label, prospective study to investigate immune boost response changes in patients with metastatic castrate-resistant prostate cancer (mCRPC).

Those enrolled in the Booster Study will have had their course of treatment with PROVENGE® immunotherapy and then randomized to the Booster Study to be treated with a single booster dose of sipuleucel-T.

Inclusion Criteria:

For a subject to be eligible for participation in this study, all of the following criteria must be satisfied:

1. Potential subjects are men aged ≥18 years who are clinically indicated for treatment with PROVENGE® (asymptomatic or minimally symptomatic metastatic castrate-resistant [hormone refractory] prostate cancer).
2. Have qualified for on-label PROVENGE® infusion
3. Have received all 3 infusions of PROVENGE® prior to randomization
4. Written informed consent provided prior to the initiation of study procedures
5. Estimated life expectancy ≥12 months

Exclusion Criteria:

A subject will not be eligible for participation in this study if any of the following criteria apply.

1. Men who are not clinically indicated for treatment with PROVENGE® (asymptomatic or minimally symptomatic metastatic castrate-resistant [hormone refractory] prostate cancer).
2. Need for systemic chronic immunosuppressive therapy, including antitumor necrosis factor alpha monoclonal antibodies, glucocorticoids, systemic steroids, blood products, GM-CSF or granulocyte colony-stimulating factor (G-CSF), any vaccinations, or experimental and investigational therapies (see Section 6.3.1)
3. Uncontrolled, concurrent illness, including, but not limited to the following: ongoing or active infection (bacterial, viral, or fungal), or psychiatric illness that would limit compliance with study requirements, as well as any condition that would preclude a subject from completing PROVENGE® or sipuleucel-T treatment.
4. On experimental or investigational therapy.

Male at birth

Based on precedent, only IPD used in the results publication may be shared; however, the internal Dendreon team has not yet discussed this.