Biomodulatory treatment of patients with castration-resistant prostate cancer: A phase II study of imatinib with ppioglitazone, etoricoxib, dexamethasone and low-dose treosulfan - Abstract

Therapeutic options for patients with castration-resistant prostate cancer (CRPC) remain limited.

In a multicenter, Phase II study, 65 patients with histologically confirmed CRPC received a biomodulatory regimen during the six-month core study. Treatment comprised daily doses of imatinib mesylate, pioglitazone, etoricoxib, treosulfan and dexamethasone. The primary endpoint was prostate-specific antigen (PSA) response. Responders could enter an extension phase until disease progression or intolerable toxicity occurred. Mean PSA was 45.3 ng/mL at baseline, and 77 % of patients had a PSA doubling time < 3 months. Of the 61 evaluable patients, 37 patients (60.6 %) responded or had stable disease and 23 of them (37.7 % of 61 patients) were PSA responders. Among the 23 responders mean PSA decreased from 278.9 ± 784.1 ng/mL at baseline to 8.8 ± 11.6 ng/mL at the final visit (week 24). The progression-free survival (PFS) was 467 days in the ITT population. Of the 947 adverse events, 57.6 % were suspected to be drug-related, 13.8 % led to dose adjustment or permanent discontinuation and 40.2 % required concomitant medication. This novel combination approach led to an impressive PSA response rate of 37.7 % in CRPC patients. The good PSA response and PFS rate combined with the manageable toxicity profile suggest an alternative treatment option.

Written by:
Vogelhuber M, Feyerabend S, Stenzl A, Suedhoff T, Schulze M, Huebner J, Oberneder R, Wieland W, Mueller S, Eichhorn F, Heinzer H, Schmidt K, Baier M, Ruebel A, Birkholz K, Bakhshandeh-Bath A, Andreesen R, Herr W, Reichle A.   Are you the author?
Department of Hematology and Oncology, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Germany.

Reference: Cancer Microenviron. 2014 Dec 11. Epub ahead of print.
doi: 10.1007/s12307-014-0161-7

PubMed Abstract
PMID: 25503648 Prostate Cancer Section