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NCT Number: NCT06991556

An Open-label Study of JSB462 (Luxdegalutamide) in Combination With Abiraterone in Adult Male Patients With Metastatic Hormone-sensitive Prostate Cancer (mHSPC)

This Phase II study aims to evaluate efficacy and safety of the combination of JSB462 (also known as luxdegalutamide) at 100 mg and 300 mg once a day (QD) doses + abiraterone compared with an androgen receptor pathway inhibitor (ARPI, abiraterone or enzalutamide) in participants with metastatic Hormone Sensitive Prostate Cancer (mHSPC) and to select the recommended dose of the combination for phase III. Towards that end, the totality of the efficacy, safety, tolerability and PK data from participants randomized in the study will be evaluated

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Key information

Conditions

Metastatic Hormone-sensitive Prostate Cancer

Age range

18 year and older

Sex eligibility

Male

Study type

Interventional

Phase

Phase 2

Primary location

Novartis Investigative Site, Adelaide, South Australia, Australia

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About this study

The study for each participant consists of a Screening period (28 days), a treatment period, a post-treatment safety follow-up (30 days) followed by a long-term follow-up period.

During the treatment period:

  • JSB462 is administered from randomization, orally, daily and continuously (100 mg or 300 mg QD) until disease progression per PCWG3-modified RECIST 1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision.
  • Abiraterone 1000 mg or enzalutamide 160 mg are administered from randomization, orally, daily, and continuously until disease progression per PCWG3-modified RECIST 1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision.

During the post-treatment follow up period:

  • Safety follow-Up: After discontinuation of study treatment, all participants will be followed for at least 1 safety follow-up visit (30 days [+/- 7 days] after treatment discontinuation). Subsequent lines of therapy may be administered according to investigator's discretion after treatment discontinuation.
  • Long-term follow-up: Starts after the Safety follow-up period and lasts until the end of study. Safety, efficacy and survival information may be collected from participants during this period.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Key Inclusion Criteria:

  • An Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) ≤2
  • Histologically confirmed adenocarcinoma of the prostate. Participants with mixed histology (neuroendocrine) are not eligible
  • High-volume mHSPC, defined by the presence of ≥1 metastatic visceral non-nodal lesion and/or ≥4 metastatic bone lesions (with at least one lesion outside the vertebral column and/or pelvis) in imaging exams (CT/MRI or bone scan) according to local radiology assessment by the investigator obtained ≤28 days prior to randomization
  • Participants must have a castrate level of serum/plasma testosterone (<50 ng/dL or <1.7 nmol/L). Ongoing ADT (as defined by prior orchiectomy and/or ongoing GnRH analog/antagonist) for ≤90 days is allowed prior to randomization, provided that PSA zero (PSA level <0.2 ng/ml according to local laboratory as assessed by the investigator) is not achieved prior to randomization.

Key Exclusion Criteria:

  • Prior exposure to a second generation ARPI (such as enzalutamide/darolutamide/apalutamide and/or abiraterone) for the treatment of advanced/metastatic disease is not allowed. Prior exposure to ARPI, to taxane chemotherapy (up to 6 cycles) or to RLT in the context of (neo)adjuvant treatment for localized prostate cancer is allowed, if the last dose of this treatment was administered >12 months from randomization. Prior use of a first generation ARPI (such as bicalutamide) in the context of ADT initiation with a GnRH analog is allowed, provided the first generation ARPI was administered for ≤14 days and last dose was administered ≥7 days from randomization.
  • Participants with biochemical recurrence only or those without evidence of metastatic disease by radiological imaging (CT/MRI or bone scan) are not eligible

Other inclusion/exclusion criteria may apply.

Treatment and study plan

JSB462

Drug

JSB462 is administered orally, daily and continuously (100 mg or 300 mg QD) until disease progression per PCWG3-modified RECIST 1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision.

Other names: luxdegalutamide

Abiraterone

Drug

Abiraterone 1000 mg is administered orally, daily and continuously until disease progression per PCWG3-modified RECIST 1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision.

Enzalutamide

Drug

Enzalutamide 160 mg is administered orally, daily and continuously until disease progression per PCWG3-modified RECIST 1.1 as assessed by the investigator, the occurrence of unacceptable toxicities, death, participant decision or investigator decision.

Primary outcomes

  1. Prostate Specific Antigen 90 (PSA90) Rate

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 months

    Prostate Specific Antigen 90 (PSA90) Rate is defined as the proportion of participants who achieve a ≥90% decrease in PSA from baseline at any timepoint, confirmed by a second PSA measurement ≥3 weeks without any PSA progression in between.

  2. Incidence rate of adverse events (AEs)

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 months

    The analysis of adverse events will include categorization by type, frequency, and severity, as graded by the NCI CTCAE version 5.0.

  3. Number of participants with dose adjustments

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 months

    The number of participants with dose adjustments (reductions, interruption, or permanent discontinuation) will be summarized by treatment arm.

  4. Duration of exposure to study treatment

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 months

    The duration of exposure in weeks to study treatment and for each study treatment component (JSB462, abiraterone and enzalutamide) will be summarized for each study treatment component by means of descriptive statistics using the SAS.

Secondary outcomes

  1. Radiographic Progression Free Survival (rPFS)

    Time frame: From date of randomization until date of radiographic progression or date of death from any cause, whichever comes first, assessed up to approximately 83 months

    Radiographic Progression Free Survival (rPFS) is defined as the time between randomization and the first occurrence of disease progression (per PCWG3-modified RECIST 1.1 as assessed by the investigator) or death due to any cause

  2. Overall Survival (OS)

    Time frame: From date of randomization until date of death from any cause, assessed up to approximately 83 months

    Overall Survival (OS) is defined as the time between randomization and death due to any cause

  3. Incidence rate of adverse events (AEs)

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 83 months

    The analysis of adverse events and laboratory abnormalities will include categorization by type, frequency, and severity, as graded by the NCI CTCAE version 5.0.

  4. Overall Response Rate (ORR)

    Time frame: From date of randomization until date of progression or date of death from any cause, whichever come first, assessed up to approximately 83 months

    Overall Response Rate (ORR) is defined as the proportion of participants achieving a confirmed complete response (CR) or partial response (PR) per PCWG3-modified RECIST 1.1 as assessed by the investigator

  5. Disease Control Rate (DCR)

    Time frame: From date of randomization until date of progression or date of death from any cause, whichever come first, assessed up to approximately 83 months

    Disease Control Rate (DCR) is defined as the proportion of participants achieving a CR, PR or stable disease (SD) per PCWG3-modified RECIST 1.1 as assessed by the investigator

  6. Duration of Response (DOR)

    Time frame: From date of randomization until date of progression or date of death from any cause, whichever come first, assessed up to approximately 83 months

    Duration of Response (DOR) is defined as the time between first documented CR/PR and disease progression or death due to any cause per PCWG3-modified RECIST 1.1 as assessed by the investigator

  7. Time to Response (TTR)

    Time frame: From date of randomization until date of first documented Complete Response (CR) or Partial Response (PR), assessed up to approximately 83 months

    Time to response (TTR) is defined as the time from randomization to the date of first documented CR or PR per PCWG3-modified RECIST 1.1 as assessed by the investigator

  8. Time to soft tissue progression (TTSTP)

    Time frame: From date of randomization until date of soft tissue radiographic progression or date of death from any cause, whichever comes first, assessed up to approximately 83 months

    Time to soft tissue progression (TTSTP) is defined as the time from randomization to the date of first documented radiographic soft tissue progression per PCWG3-modified RECIST 1.1 as assessed by the investigator

  9. Prostate Specific Antigen 30 (PSA30) Rate

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 months

    Prostate Specific Antigen 30 (PSA30) Rate is defined as the proportion of participants who achieve a ≥30% decrease from baseline at any timepoint, confirmed by a second PSA measurement ≥3 weeks without any PSA progression in between

  10. Prostate Specific Antigen 50 (PSA50) Rate

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 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

  11. Prostate Specific Antigen 0 (PSA0) Rate

    Time frame: From date of randomization till 30 days safety fup, assessed up to approximately 75 months

    Prostate Specific Antigen 0 (PSA0) Rate is defined as the proportion of participants who achieve a PSA level <0.2 ng/ml at any timepoint after start of treatment, confirmed by a second PSA measurement ≥3 weeks without any PSA progression in between

  12. Duration of biochemical response (DBR)

    Time frame: From date of date of first PSA50 response until date of PSA progression or death from any cause, assessed up to approximately 83 months

    Duration of biochemical response (DBR) is defined as the time between PSA90 and/or PSA0 and PSA progression (increase ≥25% in PSA and an absolute increase of ≥2 ng/mL from NADIR) or death due to any cause

  13. Time to first symptomatic skeletal event (TTSSE)

    Time frame: From date of randomization till EOT or death, whichever happens first, assessed up to approximately 83 months

    Time to first symptomatic skeletal event (TTSSE) is defined as the date of randomization to the date of first new symptomatic pathological bone fracture, spinal cord compression, tumor-related orthopedic surgical intervention, requirement for radiation therapy to relieve bone pain or death from any cause, whichever occurs first

  14. Plasma concentrations of JSB462 and plasma concentrations of its metabolite ARV-767

    Time frame: Day 1 of Cycles 1 and 2: Pre-dose/0h and Post-dose 4h +/- 1h. Day 1 of Cycles 3 to 8: Pre-dose/0h. End of Treatment Visit (EOT): Anytime. 1 cycle = 28 days.

    JSB462 pharmacokinetic (PK) samples will be obtained and evaluated in all participants at all dose levels in JSB462 treatment arms.

  15. Patient Reported Outcomes version of the Common Terminology Criteria for Adverse Events (PRO-CTCAE)

    Time frame: From randomization up till 30 day safety Follow-up, assessed up to approximately 83 months

    The PRO-CTCAE is a patient-reported outcomes measurement system developed by the National Cancer Institute as a companion to the CTCAE. It includes items covering participant-reported symptomatic adverse events (AEs) from the CTCAE. Each symptomatic AE concept has up to three items evaluating frequency, severity, or interference, focused on the study population and treatment regimens.

    Participants respond on a 5-point scale for each item:

    • Frequency: Never, Rarely, Occasionally, Frequently, Almost constantly
    • Severity: None, Mild, Moderate, Severe, Very severe
    • Interference: Not at all, A little bit, Somewhat, Quite a bit, Very much

    The past 7-day recall version is used, focusing on relevant symptoms like fatigue, diarrhea, and hot flashes.

Study contacts

Contact information is provided by the study sponsor or research team.

Novartis Pharmaceuticals

CONTACT

[email protected]

1-888-669-6682

Novartis Pharmaceuticals

CONTACT

[email protected]

+41613241111

Sponsors and collaborators

Lead sponsor

Novartis Pharmaceuticals

Industry

Registry information

Official study title

A Phase II, Randomized, Open-label, Multi-center Study of JSB462 (Luxdegalutamide) in Combination With Abiraterone in Adult Male Patients With Metastatic Hormone-sensitive Prostate Cancer (mHSPC)

Important dates

Study start
2025
Primary completion
2032
Study completion
2035
First posted
May 28, 2025
Registry last updated
Jun 10, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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