Interim scan during prostate cancer therapy helps guide treatment

According to the National Cancer Institute, currently the five-year survival rate for men with metastatic prostate cancer is 30.5 percent. Early assessment of treatment effectiveness is essential to providing optimal care.

In phase 2 trials, 177Lu-PSMA therapy has shown promising results in treating patients with metastatic castration-resistant prostate cancer. The therapy typically involves a preliminary PSMA PET scan to identify patients who are eligible for the treatment. While interim PET scans have shown high predictive value for lymphoma patients, this concept has not been previously explored in prostate cancer patients undergoing 177Lu-PSMA therapy.

The retrospective analysis was conducted at Klinikum rechts der Isar hospital, Technical University Munich, Germany including patients who underwent gallium-68 (68Ga)-PSMA11 PET/CT at baseline and after two cycles of 177Lu-PSMA RLT under a compassionate use program.

Instead of standardized uptake value, which is the parameter generally used in such analyses, researchers used qPSMA, an in-house developed software, to evaluate the whole-body tumor burden. "Tumor response was assessed by the changes in PSMA-avid tumor volume from baseline to the second PSMA PET using three classification methods," explained Andrei Gafita, MD. "Subsequently, we found that tumor response assessed on interim PSMA PET after two RLT cycles was associated with overall survival."

Gafita stated, "Our results therefore show that interim PSMA PET can be used for therapeutic response assessment in patients undergoing 177Lu-PSMA RLT. Furthermore, occurrence of new lesions in PSMA PET is a prognostic factor for disease progression and could be included in defining tumor response based on PSMA PET imaging."

"While further analyses involving clinical parameters are warranted," Gafita adds, "this analysis paves the way for use of interim PSMA PET in a prospective setting during 177Lu-PSMA radioligand therapy."