Prostate Cancer Clinical Trial
Official title:
VISION: An International, Prospective, Open Label, Multicenter, Randomized Phase 3 Study of 177Lu-PSMA-617 in the Treatment of Patients With Progressive PSMA-positive Metastatic Castration-resistant Prostate Cancer (mCRPC)
The primary objective of this study was to compare the two alternate primary endpoints of radiographic progression-free survival (rPFS) and overall survival (OS) in patients with progressive prostate-specific membrane antigen (PSMA)-positive metastatic castration-resistant prostate cancer (mCRPC) who received 177Lu-PSMA-617 in addition to best supportive/best standard of care (BSC/BSoC) versus patients treated with best supportive/best standard of care alone.
The study for each participant consisted of a Screening period, a Treatment period and a Follow-up period. Screening and randomization: During the screening period of up to 28 days before starting randomized treatment, each participant was assessed for PSMA positivity by gallium (68Ga) gozetotide imaging PET/scan per the pre-defined read rules, by the Sponsor's central reader. Only patients with PSMA-positive metastatic PC and meeting all other inclusion/exclusion criteria were randomized in a 2:1 ratio to receive either 177Lu-PSMA-617 plus BSC/BSoC or BSC/BSoC only. Randomized patients were stratified on the following factors: LDH level (=< or > 260 UI/L), presence of liver metastases (Yes or No), eastern cooperative oncology group (ECOG) score (0-1 or 2) and inclusion of NAAD in the BSC/BSoC (at time of randomization (Yes or No)). Protocol- specified BSC/BSoC for each patient was initiated by the investigating physician prior to patient randomization and maintained throughout the study. On-study changes to BSC/BSoC were allowed and at the discretion of the investigating physician. Randomized treatment: "Randomized treatment" in this study referred to 177Lu-PSMA- 617+BSC/BSoC (investigational arm) and BSC/BSoC only (control arm). Patients randomized to the investigational arm began 177Lu-PSMA-617 administration within 28 days after randomization (C1D1). These patients received 7.4 gigabecquerel (GBq) (+/- 10%) 177Lu-PSMA-617 once every 6 weeks (+/- 1 week) for a maximum of 6 cycles while receiving BSC/BSoC. After Cycle 4 treatment and prior to Cycle 5 treatment, the investigator assessed the following criteria to determine whether: - The patient showed evidence of response (i.e., radiological, PSA, clinical benefit). - The patient had signs of residual disease on CT with contrast/MRI or bone scan. - The patient had shown good tolerance to the 177Lu-PSMA-617 treatment. If the patient met all the criteria above and agreed to continue with additional treatment of 177Lu-PSMA-617, the Investigator could administer 2 additional cycles. A maximum of 6 cycles of 177Lu-PSMA-617 as allowed. If the patient did not meet any of the criteria or did not agree to additional 177Lu-PSMA-617 treatment, then no additional doses of 177Lu-PSMA- 617 were administered after Cycle 4. After the last cycle of 177Lu-PSMA- 617, patients continued to be treated with BSC/BSoC as long as the investigator felt they were clinically benefiting (regardless of radiographic progressive disease based on Investigator's assessment per PCWG3 criteria) or until they required a treatment regimen not allowed on this study. For both treatment arms, the cycle duration for Cycle 1-6 was 6 weeks and for Cycle 7 and beyond, was 12 weeks. From Cycle 7 onwards, all patients from both treatment arms only received BSC/BSoC. End of treatment: The EOT visit was scheduled approximately 30 days after the last dose of 177Lu-PSMA-617 or the date of the BSC/BSoC EOT decision (whichever occurred later), but before the initiation of subsequent anti-cancer treatment, outside of what was allowed on study. Long-term follow-up: Patients who consented to be followed for long-term status updates, entered the long-term follow-up period after the EOT visit. The long-term follow-up included the collection of radiographic images (if a patient discontinued for reasons other than radiographic progression), OS, information about new treatments along with the patient's response to these treatments, AE assessment, and results of hematology and chemistry testing. During the follow-up, patients are contacted every 3 months (+/-1 month) via phone, email, or letter until the end of long-term the follow-up period (24 months after the first patient enters long-term follow-up) or until 508 deaths had occurred. ;
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