Duration of androgen deprivation therapy with salvage radiotherapy in patients with prostate cancer and biochemical recurrence after surgery: Initial recruitment data in the phase III URONCOR 06-24 trial

Introduction

URONCOR 06-24 (NCT05781217) is a prospective, multicenter, randomized, open-label, phase III trial evaluating the impact on distant metastasis-free survival (MFS) of short-term (6 months) versus long-term (24 months) androgen deprivation therapy (ADT) in combination with salvage radiotherapy in high- and intermediate-risk patients after biochemical recurrence (BCR).

Material and method

A total of 534 men will be randomized to receive either 6 or 24 months of ADT. Stratification is based on risk group (intermediate vs high) and nodal status (pN0 vs pNx).

Results

From March 2023 to November 2024, 122 patients have been enrolled: 34 (28%) with intermediate risk and 88 (72%) with high risk. Fifty-five patients (45%) are pNx. The mean time from surgery to BCR is 25.4 months, and the PSA at inclusion was 0.55 ng/ml. Restaging was performed in 89 patients, 75 of whom underwent PET/CT (97%, PSMA PET/CT). Hypofractionation was used in 68% of cases, and elective pelvic irradiation in 33%. At the time of analysis, all patients had PSA normalization. No severe ADT-related toxicity has been reported.

Conclusion

URONCOR 06-24 is the first clinical trial comparing long- versus short-term ADT in the setting of BCR after prostatectomy, with stratification by risk group. Initial recruitment data show a balanced distribution of prognostic factors between both arms and no serious adverse events related to ADT.