Neoplasms

Urinary Tract, Sexual Organs, and Pregnancy Conditions

All Conditions

Immune System Diseases

Prostatic Neoplasms

Hypersensitivity

Genital Neoplasms, Male

Urogenital Neoplasms

Genital Diseases

Genital Diseases, Male

Urogenital Diseases

Prostatic Diseases

Male Urogenital Diseases

All Drugs and Chemicals

Central Nervous System Depressants

Other Dietary Supplements

Androgens

Hormones

Prolactin Release-Inhibiting Factors

Benzocaine

Hormone Antagonists

Tannic Acid

Participants received enzalutamide 160 mg capsules, orally once daily if tolerable, and continued ADT until radiographic disease progression was documented or until they started another investigational agent or new therapy for treatment of prostate cancer. Participants were to remain on study treatment until confirmed radiographic disease progression. ADT (either bilateral orchiectomy or LHRH agonist/antagonist) was maintained during study treatment.

Participants received enzalutamide-matching placebo capsules, orally once daily and continued ADT until radiographic disease progression was documented or until they started another investigational agent or new therapy for treatment of prostate cancer. Participants were to remain on study treatment until confirmed radiographic disease progression. ADT (either bilateral orchiectomy or LHRH agonist/antagonist) was maintained during study treatment."

Participants who received placebo in double-blind phase and remaind on study treatment until confirmed radiographic disease progression received enzalutamide and continued ADT in open-label phase. ADT (either bilateral orchiectomy or LHRH agonist/antagonist) was maintained during study treatment.

Enzalutamide

Placebo

All participants were required to maintain ADT during study treatment, either using luteinizing hormone-releasing hormone (LHRH) agonist/antagonist or having a history of bilateral orchiectomy.

Androgen deprivation therapy (ADT)

Medical Science Manager

The purpose of this study was to evaluate the efficacy and safety of enzalutamide plus androgen deprivation therapy (ADT) versus placebo plus ADT in Chinese subjects with metastatic hormone sensitive prostate cancer (mHSPC). The study was conducted in two phases: Double-Blind treatment phase and open-label phase.

An Efficacy and Safety Study of Enzalutamide Plus Androgen Deprivation Therapy (ADT) Versus Placebo Plus ADT in Chinese Patients With Metastatic Hormone Sensitive Prostate Cancer (mHSPC)

China ARCHES: A Multicenter, Phase 3, Randomized, Double-blind, Placebo Controlled Efficacy and Safety Study of Enzalutamide Plus Androgen Deprivation Therapy (ADT) Versus Placebo Plus ADT in Chinese Patients With Metastatic Hormone Sensitive Prostate Cancer (mHSPC)

Access to anonymized individual participant level data collected during the study, in addition to study-related supporting documentation, is planned for studies conducted with approved product indications and formulations, as well as compounds terminated during development. Studies conducted with product indications or formulations that remain active in development are assessed after study completion to determine if Individual Participant Data can be shared. Conditions and exceptions are described under the Sponsor Specific Details for Astellas on www.clinicalstudydatarequest.com.

Time to PSA progression was calculated as the time from the date of randomization to the first observation of PSA progression. PSA progression was defined as a ≥ 25% increase and an absolute increase of ≥ 2 microgram/liter (μg/L) (2 nanogram/milliliter \[ng/mL\]) above the nadir (i.e., lowest PSA value observed post baseline or at baseline), which was confirmed by a second consecutive value at least 3 weeks later. Time to event analysis was performed using Kaplan-Meier estimates.

An rPFS event was defined as the time from randomization to the first objective evidence of radiographic disease progression assessed by investigator or death (defined as death from any cause within 24 weeks from study drug discontinuation), whichever occurred first. Radiographic disease progression was defined as progressive disease by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 for soft tissue disease or by appearance of 2 or more new lesions on bone scan. Time to event analysis was performed using Kaplan-Meier estimates.

Time to first SSE was defined as the time from randomization to the occurrence of the first SSE. SSE was defined as radiation or surgery to bone, clinically apparent pathological bone fracture or spinal cord compression. Time to event analysis was performed using Kaplan-Meier estimates.

Castration resistance was defined as occurrence of radiographic disease progression, PSA progression or SSE with castrate levels of testosterone (\< 50 ng/dL). Time to castration resistance was defined as the time from randomization to the first castration resistant event (radiographic disease progression, PSA progression or SSE), whichever occurred first. PSA progression was defined as a ≥ 25% increase and an absolute increase of ≥ 2 μg/L (2 ng/mL) above the nadir (i.e., lowest PSA value observed post baseline or at baseline), which was confirmed by a second consecutive value at least 3 weeks later. Radiographic disease progression was defined as progressive disease by RECIST version 1.1 for soft tissue disease or by appearance of 2 or more new lesions on bone scan. SSE was defined as radiation or surgery to bone, clinically apparent pathological bone fracture or spinal cord compression. Time to event analysis was performed using Kaplan-Meier estimates.

The PSA response rate ≥50% is defined as the percentage of participants in the analysis population with maximal PSA declines of at least 50% at any time and at each visit for participants with detectable PSA at baseline and at least 1 post-baseline assessment.

The PSA response rate ≥90% is defined as the percentage of participants in the analysis population with maximal PSA declines of at least 90% at any time and at each visit for participants with detectable PSA at baseline and at least 1 post-baseline assessment.

Time to initiate of a new antineoplastic therapy (including cytotoxic and hormone therapies) was defined as the time interval from randomization to the date of the first dose administration of the first antineoplastic therapy. Time to event analysis was performed using Kaplan-Meier estimates.

The PSA undetectable rate was defined as the percentage of participants with detectable (≥ 0.2 ng/mL) PSA at baseline, which became undetectable (\< 0.2 ng/mL) during study treatment. Only participants with detectable PSA at baseline was included in the analysis.

The ORR was defined as the percentage of participants with measurable disease at baseline who achieved a complete or partial response (CR or PR) in their soft tissue disease using the RECIST version 1.1 criteria, CR was defined as complete disappearance of all target lesions and non-target disease. No new lesions. PR was defined as \>=30% decrease on study under baseline of the sum of longest diameters of all target lesions. No unequivocal progression of non-target disease. No new lesions.

Astellas Pharma China, Inc.

The safety (SAF) population included all randomized participants who received at least 1 dose of study drug. Data reported for deaths are the number of participants who died regardless of time (could be beyond treatment emergent adverse event time frame).

Enzalutamide Plus Androgen Deprivation Therapy (ADT) (Double Blind Phase)

Participants received enzalutamide-matching placebo capsules, orally once daily and continued ADT until radiographic disease progression was documented or until they started another investigational agent or new therapy for treatment of prostate cancer. Participants were to remain on study treatment until confirmed radiographic disease progression. ADT (either bilateral orchiectomy or LHRH agonist/antagonist) was maintained during study treatment.

Placebo Plus ADT (Double Blind Phase)

Enzalutamide Plus ADT (Open-Label Phase)

Total

Age, Continuous

Sex: Female, Male

Ethnicity (NIH/OMB)

Race (NIH/OMB)

Prior Docetaxel Use (yes or no)

High

Volume of Disease (Low Vs High)

The Intent-to-Treat (ITT) population included all participants who were randomized in the study.

Spots Global Cancer Trial Database for An Efficacy and Safety Study of Enzalutamide Plus Androgen Deprivation Therapy (ADT) Versus Placebo Plus ADT in Chinese Patients With Metastatic Hormone Sensitive Prostate Cancer (mHSPC)

Trial Identification

Conditions

Interventions

Study Description

Keywords

Eligibility

Locations

Contact Details

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