Primary Objective:
Establish the dose-limiting toxicity (DLT) and maximum tolerated dose (MTD), with degree of proteosome inhibition, of weekly mitoxantrone in combination with weekly bortezomib in patients with advanced AI-PCa.
Secondary objectives:
· Evaluate the effect of bortezomib and mitoxantrone in combination on PSA levels among patients with baseline PSA levels >/=5 ng/mL who are treated near the maximum tolerated dose.
· Monitor the effect of escalating doses of bortezomib combined with mitoxantrone on selected parameters of clinical benefit (i.e. performance status, tumor-related symptoms, measurable disease response).
Collect and/or store plasma, urine and tissue samples (i.e. prostate, bone marrow and / or lymph node) from consenting patients (optional procedures) for future studies (i.e., study the effect of the combination therapy on known targets of NFêB, growth factors for prostate cancer, and bone remodeling markers). |