- United States Food and Drug Administration (U.S. FDA) provided positive feedback on a pivotal Phase III trial for 64Cu-SAR-bisPSMA diagnostic in prostate cancer patients with biochemical recurrence (BCR), AMPLIFY.
- The positive results of the completed COBRA and PROPELLER trials, including the significantly higher uptake and retention in lesions compared to standard-of-care (SOC) imaging, as well as the substantial increase in the number of lesions detected with next-day imaging compared to same-day imaging, formed the data package to guide the design of the AMPLIFY trial.
- Approximately 220 prostate cancer patients will take part in the pivotal, non-randomised, single-arm, open-label, multi-centre Phase III trial.
- AMPLIFY is Clarity’s second registrational trial with 64Cu-SAR-bisPSMA, following advice from the U.S. FDA to address the two relevant patient populations for registration of 64Cu-SAR-bisPSMA: patients with confirmed prostate cancer pre-prostatectomy/pre-definitive treatment (CLARIFY trial); and patients with biochemical recurrence (BCR) of prostate cancer (AMPLIFY trial).
- Patient recruitment for the AMPLIFY trial is expected to commence in early 2025.
The AMPLIFY trial will be a non-randomised, single-arm, open-label, multi-centre, Phase III diagnostic clinical trial of 64Cu-SAR-bisPSMA Positron Emission Tomography (PET) in approximately 220 participants with rising or detectable PSA after initial definitive treatment. As a pivotal trial, the final study results are intended to provide sufficient evidence to support an application to the FDA for approval of 64Cu-SAR-bisPSMA as a new diagnostic imaging agent in prostate cancer.
The aim of the Phase III trial is to investigate the ability of 64Cu-SAR-bisPSMA PET/computed tomography (CT) to detect recurrence of prostate cancer. Evaluation will be across 2 imaging timepoints, Day 1 (day of administration, same-day imaging) and Day 2 (approximately 24 hours post administration, next-day imaging).
The initiation of the AMPLIFY trial is supported by compelling preclinical and clinical trial data to date, including the Phase I/II COBRA trial in patients with BCR of prostate cancer, and the Phase I PROPELLER trial in patients with confirmed prostate cancer pre-prostatectomy/pre-definitive treatment, which have been accepted for presentation or presented at leading medical conferences, including the Society of Nuclear Medicine and Molecular Imaging (SNMMI) Annual Meeting, European Association of Nuclear Medicine (EANM) Congress, American Society of Clinical Oncology (ASCO) Annual Meeting, ASCO Genitourinary Cancers Symposium and others. The data showed that 64Cu-SAR-bisPSMA is safe, and its uptake in prostate-specific membrane antigen (PSMA)-expressing cancer lesions was significantly higher compared to the approved SOC PSMA imaging agents for prostate cancer in Australia and the US. Additionally, data from the COBRA trial established that 64Cu-SAR-bisPSMA was able to detect much smaller lesions than anticipated, including a lesion with a diameter of less than 2 mm, which compares favourably against the SOC PSMA imaging agents. 64Cu-SAR-bisPSMA was also able to identify lesions months prior to these being detected by approved SOC PSMA agents (Figure 1).
Figure 1. Retroperitoneal lymph node detected by 64Cu-SAR-bisPSMA on next-day imaging. 68Ga-PSMA-11 scan performed 176 days post-Day 0 (175 days post-Day 1) did not show tracer uptake. PET/CT fusion. Prostate cancer in lymph node was confirmed via histopathology.
Clarity’s Executive Chairperson, Dr Alan Taylor, commented, “We are very excited to progress our second Phase III trial with Clarity’s lead product and appreciate the valuable guidance the FDA has provided in relation to our 64Cu-SAR-bisPSMA program to date. The data we have seen so far for this product has been incredibly favourable and we believe 64Cu-SAR-bisPSMA to be best-in-class.
“Beyond its clinical benefits, we believe that 64Cu-SAR-bisPSMA’s shelf-life of up to 48 hours will improve patient access to this important diagnostic and broaden the use of radiopharmaceuticals to more clinical sites where the short half-life of current PSMA PET tracers, such as 18F- and 68Ga-based products, restricts their use.Overview of Clarity’s SAR-bisPSMA clinical program
“This milestone with the AMPLIFY trial is a testament to the hard work of our team and collaborators. We would like to thank all clinicians and patients who participate in our clinical trials and trust us in delivering on our promise of developing products to improve treatment outcomes.
“We look forward to commencing recruitment in our registrational AMPLIFY trial early next year and continuing to build on the exceptional data that we have seen in our trials with 64Cu-SAR-bisPSMA to date. We believe that better diagnostic tools will help clinicians determine the best course of treatment for their patients, and our team and collaborators look forward to bringing this next-generation PSMA diagnostic to prostate cancer patients around the world.”
