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A Phase I Study of JSB462 (Luxdegalutamide) in Japanese Patients With Metastatic Prostate Cancer

An Open-label, Single-arm Study to Evaluate the Safety, Tolerability and Pharmacokinetics of JSB462 (Luxdegalutamide) in Japanese Patients With Metastatic Prostate Cancer - CJSB462A11101

Status
Recruiting
Phases
Phase 1
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2031250438
Enrollment
15
Registered
2025-10-17
Start date
2025-12-26
Completion date
Unknown
Last updated
2025-12-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Metastatic Prostate Cancer (mCRPC)

Interventions

Drug: JSB462 300 mg or 100 mg once a day (QD) with food

Sponsors

Yamauchi Kyosuke
Lead Sponsor

Eligibility

Sex/Gender
Male

Inclusion criteria

Inclusion criteria: - Adult male patients with histologically or cytologically confirmed and documented adenocarcinoma of the prostate. - At least 1 bone or visceral metastatic lesion (according to local radiology assessment by the investigator) present on baseline CT, MRI, or bone scan imaging obtained =<28 days prior to enrollment. Lymph nodes as only site of metastases are not allowed. - Patients with prostate cancer must have failed or refused available standard therapies, be intolerant or ineligible to receive such therapy, or for whom no standard therapy exists. - Patients 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) is allowed prior to enrollment. - Patients with an Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) =< 1.

Exclusion criteria

Exclusion criteria: - Patients with CNS metastases. - Patients with any other active malignancy other than prostate cancer. Exceptions to this criterion include the following: malignancies that were treated curatively at least 3 years before starting study treatment which have not recurred; basal cell carcinoma of the skin or squamous cell carcinoma of the skin that has undergone potentially curative local therapy or other tumors that will not affect life expectancy.

Design outcomes

Primary

MeasureTime frame
- Incidence and severity of dose limiting toxicities (DLTs) during the first cycle of treatment - Incidence rate of Adverse Events (AEs) and Serious Adverse Events (SAEs) - Number of Participants with dose adjustments - Dose Intensity - Plasma concentrations of JSB462 and its metabolite ARV-767 - AUC of JSB462 - Cmax of JSB462 - Tmax of JSB462

Contacts

Public ContactKyosuke Yamauchi

Novartis Pharma. K.K.

rinshoshiken.toroku2@novartis.com+81-120-003-293

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Feb 4, 2026