Conditions: Cancer, Prostate
Keywords: Cancer Prostate IL-6 Mitoxantrone Metastatic prostate cancer
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 106
Healthy volunteers: no

Brief summary:
The purpose of this study is to assess the safety and efficacy of siltuximab administered in combination with mitoxantrone and prednisone in participants with metastatic (spread of cancer cells from one part of the body to another) hormone-refractory (not responding to treatment) prostate cancer (abnormal tissue that grows and spreads in the body) (HRPC).

Detailed description:
This is a 2-part, open-label (all people know the identity of the intervention) multicenter (when more than 1 hospital or medical school team work on a medical research study), Phase 2 study to evaluate the safety and efficacy of the combination of siltuximab plus mitoxantrone versus mitoxantrone in participants with metastatic HRPC who have received 1 prior Docetaxel-based chemotherapy (treatment of disease, usually cancer, by chemical agents) regimen (pattern of giving treatment). Part 1 of the study is single arm where participants will receive mitoxantrone, prednisone and siltuximab. Part 2 of the study is randomized portion (the study drug is assigned by chance), consisting of 2-arms. The experimental arm will consist of treatment with mitoxantrone, prednisone and siltuximab. The control arm will consist of treatment with mitoxantrone and prednisone. Mitoxantrone will be administered at a dose of 12 milligram per square meter (mg/m\^2) intravenously (into a vein) as a 30-minute infusion (a fluid or a medicine delivered into a vein by way of a needle) on Day 1 of each 3-week cycle, until disease progression or unacceptable toxicity (any harmful effect of a drug) or up to 10 cycles (a maximum total dose of approximately 120 mg/m\^2). Siltuximab will be administered at a dose of 6 mg/kilogram intravenously as a 2-hour infusion, starting Day 1 of Cycle 1 to continue every 2 weeks until disease progression or unacceptable toxicity or up to a maximum of 1 year. All participants will receive prednisone 5 mg twice daily starting with the first administration of Mitoxantrone. The duration of treatment will be a maximum of 12 months for cumulative dose. Radiologic assessments will be performed on Week 12 after the first study agent dosing, then every 9 weeks until the end of treatment and then once every 3 months until documented disease progression. Tumor (a mass in a specific area) response will be assessed using Response Evaluation Criteria in Solid Tumors (RECIST) criteria. There will be short-term follow-up visits (conducted monthly for 2 months), followed by long-term follow-up visits (conducted once every 3 months). Participants' safety will also be monitored throughout the study.

Arms:
arm 1: In Part 1, mitoxantrone 12 milligram per square meter (mg/m\^2) will be given intravenously as a 30-minute infusion on Day 1 of each 3-week cycle until disease progression or unacceptable toxicity or up to 10 cycles (a maximum cumulative dose of approximately 120 mg/m\^2) along with siltuximab 6 mg/kilogram (mg/kg) intravenously as a 2 hour-infusion every 2 weeks until disease progression or unacceptable toxicity or up to a maximum of 1 year; and prednisone 5 mg orally twice daily starting with the first administration of mitoxantrone. arm 2: In Part 2, mitoxantrone 12 mg/m\^2 will be given intravenously as a 30-minute infusion on Day 1 of each 3-week cycle until disease progression or unacceptable toxicity or up to 10 cycles (a maximum cumulative dose of approximately 120 mg/m\^2) along with siltuximab 6 mg/kg intravenously as a 2-hour infusion every 2 weeks until disease progression or unacceptable toxicity or up to a maximum of 1 year; and prednisone 5 mg orally twice daily starting with the first administration of mitoxantrone. arm 3: In Part 2, mitoxantrone 12 mg/m\^2 will be given intravenously as a 30-minute infusion on Day 1 of each 3-week cycle until disease progression or unacceptable toxicity or up to 10 cycles (a maximum cumulative dose of approximately 120 mg/m\^2) along with prednisone 5 mg orally twice daily starting with the first administration of mitoxantrone.

Interventions: intervention 1: Mitoxantrone intervention 2: Siltuximab intervention 3: Prednisone
Intervention descriptions: intervention 1: Mitoxantrone 12 mg/m\^2 intravenously as a 30 minute infusion on Day 1 of each 3-week cycle until disease progression or unacceptable toxicity or up to 10 cycles (a maximum cumulative dose of approximately 120 mg/m\^2) intervention 2: Siltuximab 6 mg/kg intravenously as a 2 hour infusion every 2 weeks until disease progression or unacceptable toxicity or up to a maximum of 1 year intervention 3: Prednisone 5 mg orally twice daily

Protocol document: