Testing the Addition of the Drug Relugolix to the Usual Radiation Therapy for Advanced-Stage Prostate Cancer, The NRG Promethean Study

Description

PRIMARY OBJECTIVE:

I. Compare conventional radiological progression-free survival (rPFS) for positron emission tomography (PET)-detected, biochemically recurrent, oligometastatic, castration-sensitive prostate cancer patients treated with stereotactic ablative body radiation therapy (SABR) plus placebo versus (vs.) SABR plus relugolix.

SECONDARY OBJECTIVES:

I. Compare conventional or PET-based radiological progression-free survival (prPFS) between treatment arms.

II. Compare patient-reported sexual and hormonal quality of life as assessed by corresponding Expanded Prostate Cancer Index Composite Short Form (EPIC-26) domains between treatment arms.

III. Compare other measures of quality of life obtained from the European Quality of Life Five Dimension Five Level Scale Questionnaire (EQ5D-5L), European Organization for Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire Core 30 (QLQ-30), Patient Reported Outcomes Measurement Information System (PROMIS) Fatigue instruments between the two treatment arms.

IV. Compare time to salvage therapy and time to castration-resistance between treatment arms.

V. Compare local progression (SABR-targeted lesion), biochemical progression, distant metastases, prostate cancer-specific mortality, metastasis-free survival, and overall survival between treatment arms.

VI. Determine adverse events rates and compare rates between the two treatment arms.

EXPLORATORY OBJECTIVE:

I. Evaluate genomic and peripheral tissue and blood markers of treatment response.

OUTLINE: Patients are randomized to 1 of 2 arms.

ARM I: Patients receive placebo orally (PO) once daily (QD) on days 1-180 and undergo SABR for 1-3 weeks in the absence of disease progression or unacceptable toxicity.

ARM II: Patients receive relugolix PO QD on days 1-180 and undergo SABR for 1-3 weeks in the absence of disease progression or unacceptable toxicity.

Patients may also undergo bone scan, computed tomography (CT), magnetic resonance imaging (MRI), prostate-specific membrane antigen (PSMA) positron emission tomography (PET)/CT or PET/MRI, and/or fluciclovine F18 PET/CT or PET/MRI at time of disease progression. Patients may optionally undergo urine and blood sample collection throughout the trial.

After completion of study treatment, patients are followed up at 9 and 12 months, subsequently every 6 months to month 60, and then annually thereafter or at the time of progression.