Early Switch From First-Line Docetaxel/Prednisone to Cabazitaxel/Prednisone and the Opposite Sequence, Exploring Molecular Markers in Men With Metastatic Castration-Resistant Prostate Cancer (mCRPC)

Summary

Docetaxel and cabazitaxel are cancer chemotherapy agents of the taxane drug class. The purpose of this study is to explore the benefit, for treatment of metastatic castration-resistant prostate cancer (mCRPC), of a regimen in which participants begin treatment with either of these two taxane drugs (docetaxel or cabazitaxel, in combination with prednisone) and are switched to the other taxane drug if prostate-specific antigen (PSA) value does not decrease ≥30% after 4 cycles. As defined in study protocol amendment 3, efficacy results are summarized for all participants combined, irrespective of which agent (docetaxel or cabazitaxel) was administered initially, rather than separately for the two groups based on taxane administered initially. One of the primary outcome measures is percentage of participants with a ≥50% sustained decrease from baseline in PSA at any time during the trial. By providing an opportunity for patients to switch taxane based on early PSA response, there may be a difference in result for this measure versus result in a study where it was not possible to switch. The other primary outcome measures are change from baseline in circulating tumor cells (CTCs) biomarkers percent androgen receptor nuclear localization (%ARNL) and microtubule bundling (MTB).

Timeline

Start

2013-03

Primary completion

2015-08

Completion

2015-08

Publications

• Tagawa ST, Antonarakis ES, Gjyrezi A, Galletti G, Kim S, Worroll D, Stewart J, Zaher A, Szatrowski TP, Ballman KV, Kita K, Tasaki S, Bai Y, Portella L, Kirby BJ, Saad F, Eisenberger MA, Nanus DM, Giannakakou P. Expression of AR-V7 and ARv567es in Circulating Tumor Cells Correlates with Outcomes to Taxane Therapy in Men with Metastatic Prostate Cancer Treated in TAXYNERGY. Clin Cancer Res. 2019 Mar 15;25(6):1880-1888. doi: 10.1158/1078-0432.CCR-18-0320. Epub 2018 Oct 9.
• Antonarakis ES, Tagawa ST, Galletti G, Worroll D, Ballman K, Vanhuyse M, Sonpavde G, North S, Albany C, Tsao CK, Stewart J, Zaher A, Szatrowski T, Zhou W, Gjyrezi A, Tasaki S, Portella L, Bai Y, Lannin TB, Suri S, Gruber CN, Pratt ED, Kirby BJ, Eisenberger MA, Nanus DM, Saad F, Giannakakou P; TAXYNERGY Investigators. Randomized, Noncomparative, Phase II Trial of Early Switch From Docetaxel to Cabazitaxel or Vice Versa, With Integrated Biomarker Analysis, in Men With Chemotherapy-Naive, Metastatic, Castration-Resistant Prostate Cancer. J Clin Oncol. 2017 Oct 1;35(28):3181-3188. doi: 10.1200/JCO.2017.72.4138. Epub 2017 Jun 20.

Drugs

Indications