Updated June 2026 · ClinicalTrials.gov

RECRUITINGPhase 3INTERVENTIONAL

Hypo-fractionated Radiation Therapy With or Without Androgen Suppression for Intermediate Risk Prostate Cancer

Q: Who can participate in NCT01492972?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

Q: How do I contact the trial site for NCT01492972?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Q: Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Q: Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

Phase III Study of Image Guided Radiation Therapy With or Without Androgen Suppression for Intermediate Risk Adenocarcinoma of the Prostate

Hypo-fractionated Radiation Therapy With or Without Androgen Suppression for Intermediate Risk Prostate Cancer (NCT01492972) is a Phase 3 interventional studying Prostate Cancer, sponsored by Proton Collaborative Group. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

About This Trial

The purpose of this study is to compare the effects, good and/or bad of two treatment methods on subjects and their cancer. Proton beam radiation therapy is one of the treatments for men with prostate cancer who have localized disease. The benefit of the combination with androgen suppression is not completely understood. This study will compare the use of hypofraction proton therapy (28 treatments) alone to proton therapy with androgen suppression therapy.

What Stage of Research Is This?

Phase 3 trials confirm efficacy and safety in large patient groups (often 300–3,000+) and form the evidence base for an FDA approval submission. For Prostate Cancer, Phase 3 studies typically randomize participants between the investigational treatment and either a placebo or current standard of care. A successful Phase 3 result is the threshold most treatments need to clear before regulatory approval.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

Target enrollment of 192 participants puts this in the typical range for a Phase 2-style efficacy study or a moderate Phase 3 trial in a focused Prostate Cancer subpopulation. At this scale, the study has enough statistical power to detect a clear treatment effect but is not the largest cohort in the field.

Who May Be Eligible (Plain English)

Who May Qualify: - diagnosed by tissue sample (biopsy-confirmed) prostate adenocarcinoma (within 365 days of randomization) at intermediate risk for reoccurrence determined by at least one of the following: Gleason Score 7, PSA \> = 10 and \< = 20, T stage T2b - T2c - Clinical stages T1-T2c N0 M0 as staged by the treating investigator. (AJCC Criteria 7th Ed.- appendix III). - Histological evaluation of prostate biopsy with assignment of a Gleason score to the biopsy material; Gleason score must be in the range of 2-7. \> 6 cores are strongly recommended. - PSA values \< = 20 ng/ml within 90 days prior to randomization. Obtained prior to biopsy or at least 21 days after prostate biopsy. - You should be able to carry out daily activities with 0 level of ability (ECOG 0)-1 (appendix II) assessed within 90 days of randomization. - Patients must sign IRB approved study specific willing to sign a consent form. - Patients must complete all required pre-entry tests listed in section 4.0 within the specified time frames. - Patients must be able to start treatment within 56 days of randomization. - Patients must be at least 18 years old. - For brachytherapy, an IPSS ≤ 21, or ≤ 17 if patient is on medications to improve urination. - For brachytherapy, prostate volume must be less than 55cc prior to AS. Who Should NOT Join This Trial: - Pelvic lymph nodes \> 1.5 cm in greatest dimension unless the enlarged lymph node is biopsied and negative. - Previous prostate cancer surgery to include: prostatectomy, hyperthermia and cryosurgery. - Previous pelvic radiation for prostate cancer. - Previous androgen suppression therapy for prostate cancer. - Active rectal diverticulitis, Crohn's disease affecting the rectum or ulcerative colitis (non-active diverticulitis and Crohn's disease not affecting the rectum are allowed). - Prior systemic chemotherapy for prostate cancer. - History of proximal urethral stricture requiring dilatation. ...See full criteria on ClinicalTrials.gov Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language

Inclusion Criteria: * Histologically confirmed prostate adenocarcinoma (within 365 days of randomization) at intermediate risk for reoccurrence determined by at least one of the following: Gleason Score 7, PSA \> = 10 and \< = 20, T stage T2b - T2c * Clinical stages T1-T2c N0 M0 as staged by the treating investigator. (AJCC Criteria 7th Ed.- appendix III). * Histological evaluation of prostate biopsy with assignment of a Gleason score to the biopsy material; Gleason score must be in the range of 2-7. \> 6 cores are strongly recommended. * PSA values \< = 20 ng/ml within 90 days prior to randomization. Obtained prior to biopsy or at least 21 days after prostate biopsy. * ECOG performance status 0-1 (appendix II) assessed within 90 days of randomization. * Patients must sign IRB approved study specific informed consent. * Patients must complete all required pre-entry tests listed in section 4.0 within the specified time frames. * Patients must be able to start treatment within 56 days of randomization. * Patients must be at least 18 years old. * For brachytherapy, an IPSS ≤ 21, or ≤ 17 if patient is on medications to improve urination. * For brachytherapy, prostate volume must be less than 55cc prior to AS. Exclusion Criteria: * Pelvic lymph nodes \> 1.5 cm in greatest dimension unless the enlarged lymph node is biopsied and negative. * Previous prostate cancer surgery to include: prostatectomy, hyperthermia and cryosurgery. * Previous pelvic radiation for prostate cancer. * Previous androgen suppression therapy for prostate cancer. * Active rectal diverticulitis, Crohn's disease affecting the rectum or ulcerative colitis (non-active diverticulitis and Crohn's disease not affecting the rectum are allowed). * Prior systemic chemotherapy for prostate cancer. * History of proximal urethral stricture requiring dilatation. * Current and continuing anticoagulation with warfarin sodium (Coumadin), heparin, low- molecular weight heparin, Clopidogrel bisulfate (Plavix), or equivalent (unless it can be stopped to manage treatment related toxicity or to have a biopsy if needed). * Major medical, addictive or psychiatric illness which in the investigator's opinion, will prevent the consent process, completion of the treatment and/or interfere with follow-up. (Consent by legal authorized representative is not permitted for this study). * Evidence of any other cancer within the past 5 years and \< 50% probability of a 5 year survival. (Prior or concurrent diagnosis of basal cell or non-invasive squamous cell cancer of the skin is allowed). * History of myocardial infarction within the last 6 months.

Treatments Being Tested

RADIATION

Radiation

Consists of: 1. Conformal Proton Radiation Dose: 2.5 Gy (RBE) five days a week in 28 treatments over 5.5-6.5 weeks (total dose: 70 Gy (RBE)) 2. High Dose Radiation with IMRT alone: 1.8 Gy five days a week in 45 treatments over 9-10 weeks (total dose: 81 Gy) 3. Intraoperative LDR Brachytherapy and IMRT: 100Gy Pad103 implant and IMRT 1.8 Gy five days a week in 25 treatments over 5-6 weeks (total dose: 45 Gy)

DRUG

Androgen Suppression Therapy

Androgen suppression will begin 8 - 10 weeks prior to the start of RT for a total of 6 (+/- 2) months. Luteinizing Hormone-Releasing Hormone (LHRH) agonist therapy will consist of analogs approved by the FDA (or by Health Canada for Canadian institutions)

Locations (4)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

Mayo Clinic

Scottsdale, Arizona, United States

Northwestern Medicine Chicago Proton Center

Warrenville, Illinois, United States

Oklahoma Proton Center

Oklahoma City, Oklahoma, United States

Hampton University Proton Therapy Institute

Hampton, Virginia, United States

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT01492972), the sponsor (Proton Collaborative Group), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT01492972 clinical trial studying?

Who can participate in NCT01492972?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT01492972?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

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Source: ClinicalTrials.gov API v2 record for NCT01492972. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT01492972. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-06-26 · Data from ClinicalTrials.gov.