Testing the Addition of the Drug Relugolix to the Usual Radiation Therapy for Advanced-Stage Prostate Cancer (NRG PROMETHEAN)

  • End date
    Oct 10, 2029
  • participants needed
  • sponsor
    NRG Oncology
Updated on 21 March 2022


This phase II trial tests whether relugolix and radiation therapy works to shrink tumors in patients with prostate cancer that has spread in a limited way to 1 to 5 other parts of the body (oligometastatic). Testosterone can cause the growth of prostate cancer cells. Relugolix lowers the amount of testosterone made by the body. This may help stop the growth of tumor cells that need testosterone to grow. Giving relugolix with radiation therapy may help lower the chance of prostate cancer growing or spreading.



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.


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.


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.

After completion of study treatment, patients are followed up at 3 and 6 months, every 6 months for 4 years, and then annually thereafter.

Condition Oligometastatic Prostate Carcinoma, Prostate Adenocarcinoma, Stage IVB Prostate Cancer AJCC v8
Treatment quality-of-life assessment, stereotactic body radiation therapy, Placebo Administration, Relugolix
Clinical Study IdentifierNCT05053152
SponsorNRG Oncology
Last Modified on21 March 2022


Yes No Not Sure

Inclusion Criteria

Pathologically (histologically or cytologically) proven diagnosis of prostate adenocarcinoma at any anatomical location (for example, prostate, metastatic site), including intraductal or ductal carcinoma, at any time before registration
Age >= 18 years
Eastern Cooperative Oncology Group (ECOG) performance status 0-2 within 120 days prior to registration
Prior curative-intent treatment to the prostate, by either
External beam and/or brachytherapy to: Prostate alone, prostate and seminal vesicles, prostate and pelvic nodes, or radiation to all three sites
Radical prostatectomy alone, radical prostatectomy plus postoperative radiotherapy to the prostate bed, or radical prostatectomy plus postoperative radiotherapy to the pelvic nodes
Must meet study entry criteria based on the following diagnostic workup within 120
days prior to registration
History and physical examination
Technetium TC-99m (99mTc) bone scan (Must be negative)
Either computed tomography (CT) or magnetic resonance imaging (MRI) of pelvis +/- abdomen (Must be negative)
Fluciclovine or prostate-specific membrane antigen (PSMA) PET scan (Must be positive with exception of local disease)
Note: All 3 scans are mandatory (bone scan; CT/magnetic resonance [MR]; PET)
- 5 oligometastatic lesions in bone and/or nodal/soft tissue sites on fluciclovine
or PSMA PET within 120 days prior to registration and includes at least ONE of
Bone - each metastasis is counted (for example, 2 distinct lesions in the right ilium count as 2 oligometastatic lesions)
Extrapelvic Nodal/ soft tissue - requires at least one extrapelvic inguinal or a nodal/soft tissue lesion superior to the iliac bifurcation (that is, American Joint Committee on Cancer [AJCC] M1a version 8)
Note: Although a patient must have bone and/or extrapelvic disease to be eligible, when counting the number of oligometastatic lesions, each lymph node lesion, whether pelvic or extrapelvic, is counted (for example, 2 distinct lymph nodes in the right external iliac basin count as 2 oligometastatic lesions; one extrapelvic and one pelvic node count as 2 oligometastic lesions, etc)
Serum total prostate-specific antigen (PSA) < 10.0 ng/mL obtained within 120 days
prior to registration that also meets ONE of the following PSA recurrence
PSA > post-radiation therapy (RT) nadir PSA + 2 ng/mL, if patient received-radiation therapy to intact prostate, or
Current PSA > 0.2 ng/mL, with a second confirmatory PSA > 0.2 ng/mL if patient received a radical prostatectomy with or without post-op RT
Must have > 3 PSA values within the last two years since end of primary treatment or
within the last 2 years prior to registration, whichever is less
Note: PSA doubling time must be calculated by entering all PSA values since end of primary treatment or within the last 2 years prior to registration (whichever is less) into the PSA Doubling Time Calculator found at MDCalc.com
Serum total testosterone > 100 ng/dL within 120 days prior to registration
Note: Prior androgen deprivation therapy (other than bilateral orchiectomy) is allowed if discontinued prior to registration and serum total testosterone is >= 100 ng/dL
Total bilirubin: =< 1.5 x institutional upper limit of normal (ULN) (Note: In subjects
with Gilbert's syndrome, if total bilirubin is > 1.5 x ULN, subject is
eligible if direct bilirubin is =< 1.5 x ULN) (within 120 days prior to
Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT]) and alanine aminotransferase (ALT) (serum glutamic pyruvic transaminase [SGPT]): =< 2.5 x institutional ULN (within 120 days prior to registration)
For patients with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated
Note: Known positive test for hepatitis B virus surface antigen (HBV sAg) indicating acute or chronic infection would make the patient ineligible unless the viral load becomes undetectable on suppressive therapy. Patients who are immune to hepatitis B (anti-hepatitis B surface antibody positive) are eligible (e.g. patients immunized against hepatitis B)
Patients with a history of hepatitis C virus (HCV) infection must have been treated
and cured. For patients with HCV infection who are currently on treatment
they are eligible if they have an undetectable HCV viral load
Note: Known positive test for hepatitis C virus ribonucleic acid (HCV RNA) indicating acute or chronic infection would make the patient ineligible unless the viral load becomes undetectable on suppressive therapy
Human immunodeficiency virus (HIV)-infected patients on effective anti-retroviral
therapy with undetectable viral load within 6 months are eligible for this
The patient must agree to use a highly effective contraception (even men with vasectomies) if he is having sex with a woman of childbearing potential or with a woman who is pregnant while on study drug and for 2 weeks following the last dose of study drug
The patient or a legally authorized representative must provide study-specific informed consent prior to study entry and, for patients treated in the United States (U.S.), authorization permitting release of personal health information

Exclusion Criteria

Clinical, biopsy-proven, or radiologic (conventional or PET imaging) evidence of local tumor recurrence in the prostate and/or periprostatic/seminal vesicle region after radiotherapy, or in the prostate bed after prostatectomy
Note: if a patient had a prior local recurrence and received local salvage therapy, the patient is eligible if there is no current evidence of disease in the prostate/prostate bed. Patients with positive findings on examination or imaging remain eligible if biopsy of the site is negative for cancer
Currently on androgen deprivation or anti-androgen therapy
Definitive radiologic evidence of metastatic disease on conventional imaging, defined by one of the following
Osseous metastasis on 99mTc radionuclide bone scan, or
Extra pelvic nodal/soft tissue disease (> 1.5 cm in short axis) on CT or MRI pelvis +/- abdomen
Spinal cord compression, or spinal intramedullary, brain, and/or visceral (for example
liver, lung, etc.) metastasis
Note: Spinal metastases (PET-detected) with epidural extension are eligible if there is > 0.3 cm spatial separation between the gross tumor volume and spinal cord
Biopsy-proven prostatic carcinoma with signet-ring, sarcomatoid, or neuroendocrine
features (for example, small cell)
Prior metastatic or non-metastatic, invasive malignancy (except non metastatic, non-melanomatous skin cancer) unless continuously disease free for >= 3 years
Prior chemotherapy for prostate cancer or bilateral orchiectomy
Note: Prior chemotherapy for a different cancer is allowed if continuously disease-free for >= 3 years
Prior radiotherapy to a lesion (i.e. oligometastatic recurrence by PET)
Note: Lesions outside of a previously irradiated planning treatment volume (PTV) are eligible as long as the prescription isovolume dose of any prior radiotherapy course is > 2.0 cm distant from new lesion
Inability to treat all oligometastatic sites with radiotherapy in the judgement of the
Intrapelvic lymph nodes as only site of prostate cancer recurrence
Inability to swallow whole, undivided, unchewed, and uncrushed pills
Known gastrointestinal disorder affecting oral medication absorption
Co-morbidity defined as follows
Inflammatory bowel disease in patients in whom abdominopelvic radiotherapy is planned
History of congenital long QT syndrome
Current severe or unstable angina
New York Heart Association functional classification III/IV heart failure (Note: Patients with known history or current symptoms of cardiac disease, or history of treatment with cardiotoxic agents, should have a clinical risk assessment of cardiac function using the New York Heart Association functional classification)
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