A Study of JSB462 (Luxdegalutamide) Plus Lutetium (177Lu) Vipivotide Tetraxetan in Patients With Metastatic Castration Resistant Prostate Cancer (mCRPC)

Condition(s) studied

Investigational drug(s) / intervention(s)

JSB462: Administered orally, daily and continuously (100 mg or 300 mg QD) until disease progression per PCWG3-modified RECIST v1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision

AAA617: administered at 7.4 GBq intravenously every 6 weeks for up to 6 doses, unless there is disease progression per PCWG3-modified RECIST v1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision

Study summary

This Phase II study aims to evaluate the efficacy and safety of the combination of JSB462 (also known as luxdegalutamide) at 100 mg and 300 mg QD doses + lutetium (177Lu) vipivotide tetraxetan (hereafter referred as AAA617) compared with AAA617 (control) in participants with metastatic Castration Resistant Prostate Cancer (mCRPC) with prior exposure to at least 1 Androgen Receptor Pathway Inhibitor (ARPI) and 0-2 taxane regimens and to select the recommended dose of the combination for phase III. Towards that end, the totality of the efficacy, safety, tolerability and pharmacokinetic (PK) data from participants randomized in the study will be evaluated.

Eligibility

Primary outcome measure(s)

• Prostate Specific Antigen 50 (PSA50) Rate — From date of randomization till 30 days safety fup, assessed up to approximately 30 months
  Prostate Specific Antigen 50 (PSA50) Rate is defined as the proportion of participants who achieve a ≥50% decrease from baseline at any timepoint, confirmed by a second PSA measurement ≥3 weeks without any PSA progression in between
• Incidence rate of adverse events (AEs) — From date of randomization till 30 days safety fup, assessed up to approximately 30 months
  The analysis of adverse events will include categorization by type, frequency, and severity, as graded by the NCI CTCAE version 5.0.
• Number of participants with dose adjustments — From date of randomization till 30 days safety fup, assessed up to approximately 30 months
  The number of participants with dose adjustments (reductions, interruption, or permanent discontinuation) will be summarized by treatment arm.
• Duration of exposure to study treatment — From date of randomization till 30 days safety fup, assessed up to approximately 30 months
  Dose interruptions, dose reductions, drug discontinuations, dose intensity, and duration of exposure to study treatment (all study drugs).

Trial sites (44)

+ 4 more sites — see the full list on the official registry below.

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