DORA PCCTC Trial: Docetaxel Versus Docetaxel in Combination with Radium-223 in Patients with Metastatic Castration-Resistant Prostate Cancer

Background: Ra-223, a bone-targeted alpha therapy, is a well-tolerated treatment option that prolongs survival in patients (pts) with symptomatic mCRPC to bone. Docetaxel targets microtubule trafficking improving survival in the mCRPC and metastatic hormone-sensitive settings. We hypothesized that simultaneously targeting the tumor and bone compartment yields superior outcomes than targeting either alone. We previously determined the dose and schedule of co-administering Ra-223 + docetaxel in a randomized phase I/IIa trial. The combination appeared to have superior declines in prostate specific antigen (PSA) and bone markers, delayed PSA progression, and was better tolerated (with adjusted dose/schedule) relative to standard docetaxel alone. We are now conducting a phase III study.  Read More

At the 2021 ASCO Dr. Michael Morris and colleagues reviewed the trial design for a phase III study to determine the clinical benefit of docetaxel versus docetaxel and Radium-223 in patients with mCRPC, the DORA trial. Read More

Radium-223 is a bone-targeted alpha therapy that prolongs survival in patients with symptomatic metastatic castration-resistant prostate cancer (mCRPC) to the bone based on results from the phase III ALSYMPCA trial. Read More

Dr. Michael Morris began by describing the microenvironment around bone tumors. The tumor growth is affected by both osteoclasts and osteoblasts. It is important to realize that Radium-223 attacks this microenvironment and not the tumor itself.  Read More

In the trials in progress poster session Dr. Michael Morris presented their phase III trial of docetaxel versus docetaxel and radium-223 (Ra-223) in patients with metastatic castration-resistant prostate cancer (mCRPC): DORA.  Ra-223, a bone-targeted alpha therapy, i Read More