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Targeted MET Inhibition in Castration-Resistant Prostate Cancer: A Randomized Phase II Study and Biomarker Analysis with Rilotumumab plus Mitoxantrone and Prednisone
Targeted MET Inhibition in Castration-Resistant Prostate Cancer: A Randomized Phase II Study and Biomarker Analysis with Rilotumumab plus Mitoxantrone and Prednisone CLINICAL CANCER RESEARCH Ryan, C. J., Rosenthal, M., Ng, S., Alumkal, J., Picus, J., Gravis, G., Fizazi, K., Forget, F., Machiels, J., Srinivas, S., Zhu, M., Tang, R., Oliner, K. S., Jiang, Y., Loh, E., Dubey, S., Gerritsen, W. R. 2013; 19 (1): 215-224Abstract
To evaluate the efficacy, safety, biomarkers, and pharmacokinetics of rilotumumab, a fully human, monoclonal antibody against hepatocyte growth factor (HGF)/scatter factor, combined with mitoxantrone and prednisone (MP) in patients with castration-resistant prostate cancer (CRPC).This double-blinded phase II study randomized (1:1:1) patients with progressive, taxane-refractory CRPC to receive MP (12 mg/m(2) i.v. day 1, 5 mg twice a day orally days 1-21, respectively) plus 15 mg/kg rilotumumab, 7.5 mg/kg rilotumumab, or placebo (i.v. day 1) every 3 weeks. The primary endpoint was overall survival (OS).One hundred and forty-four patients were randomized. Median OS was 12.2 versus 11.1 months [HR, 1.10; 80% confidence interval (CI), 0.82-1.48] in the combined rilotumumab versus control arms. Median progression-free survival was 3.0 versus 2.9 months (HR, 1.02; 80% CI, 0.79-1.31). Treatment appeared well tolerated with peripheral edema (24% vs. 8%) being more common with rilotumumab. A trend toward unfavorable OS was observed in patients with high tumor MET expression regardless of treatment. Soluble MET levels increased in all treatment arms. Total HGF levels increased in the rilotumumab arms. Rilotumumab showed linear pharmacokinetics when co-administered with MP.Rilotumumab plus MP had manageable toxicities and showed no efficacy improvements in this estimation study. High tumor MET expression may identify patients with CRPC with poorer prognosis.
View details for DOI 10.1158/1078-0432.CCR-12-2605
View details for Web of Science ID 000313051100023
View details for PubMedID 23136195