Use of biochemical and imaging criteria for selecting patients for prostate biopsy in recurrence risk assessment post-HIFU therapy

Purpose Despite the growing adoption of HIFU treatment for localized prostate cancer (PC), standardized criteria for evaluating success and predicting recurrence remain undefined. Herein, we analyze the predictive value of noninvasive tools such as PSA dynamics and MRI to determine recurrence. Methods We identified from our HIFU therapy prospective registry patients who developed biopsy-proven recurrence, between 2016 and 2023. Clinically significant recurrence (CS-R) was defined as the presence of GG 2 or greater on control biopsy. Different modalities of PSA kinetics were analyzed and determinants for recurrence were based on either PSA or MRI criteria (PIRADS > 3). Sensitivity, specificity, PPV, and NPV were estimated based on single or combined criteria. Results 92 patients were included in the study. A total of 17(18%) patients had CS-R. Those patients presented higher PSA velocity (p < 0.001) and a higher proportion of PSA above nadir + 1 at 12 months (p = 0.001). Static PSA measurement and % of PSA drop were not associated with recurrence. Follow-up based on a combination of PSA parameters (PSA below nadir + 1) and MRI criteria had higher sensitivity (88%) and negative predictive value (96%) in detecting post-treatment recurrence. Limitation of the study included limited number of patients and a relatively short follow up period. Conclusions Post-HIFU recurrence surveillance through dynamic PSA monitoring shows better predictive value. Implementing 'for cause' surveillance biopsies guided by dynamic PSA changes along with mpMRI appears to enhance the detection of recurrences without missing a significant number of cases.