NCT05665738Recruiting
Two-fraction HDR Monotherapy for Localized Prostate Cancer
Two-fraction High Dose Rate Brachytherapy as Monotherapy Delivered Three Hours Apart in Localized Prostate Cancer: A Pilot Study
Source: ClinicalTrials.gov · Last updated 17 Sept 2026
Brief summary (registry, in English)
This is a single center single arm prospective pilot study investigating the safety of high dose rate (HDR) brachytherapy as monotherapy delivered in 2 fractions 3 hours apart. HDR monotherapy has been established as safe and effective in this context, however previous studies have delivered 2 fractions on separate days, or at least 6 hours apart. Clinically, this regimen, if shown to be safe and effective in future studies, has the potential to reduce operative resources and logistical stresses on brachytherapy departments.
- Status (registry)
- Recruiting
- Study type
- Interventional
- Enrollment
- 17 (estimated)
- First submitted
- 16 Dec 2022
- Start date
- 11 Sept 2024
- Primary completion date
- 28 Feb 2029
- Lead sponsor
- University of California, San Francisco
- Diseases
- Prostate cancer
- NCT number
- NCT05665738
What you commit to
- Study type: Interventional
- Planned participants: 17
- From 11 Sept 2024 to the primary completion date, 28 Feb 2029
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Any prior treatment for prostate cancer.
- Prior history of pelvic malignancy.
- Any prior androgen deprivation therapy.
- Is currently receiving any other investigational agents.
- Contraindications to radiotherapy.
- Prior history of pelvic radiotherapy.
- Prior cryosurgery or cryotherapy to the prostate.
- Prior transurethral resection of the prostate (TURP) or transurethral incision within the previous 6 months.
- IPSS score of 15 or higher prior to treatment.
Other
- Abnormal pre-brachytherapy assessment raising concern for undergoing HDR brachytherapy procedure.
- Contraindications to general anesthesia.
- Presence of lymph node or distant metastases.
- Estimated prostate volume \>60 cubic centimeters as determined by transrectal ultrasound or magnetic resonance imaging.
Who the study is looking for
- Participants must have histologically or cytologically confirmed diagnosis of prostate adenocarcinoma.
- National Comprehensive Cancer Network favorable intermediate risk stratification, defined as one or more intermediate risk factors such as cT2b - cT2c category, grade group 1 or 2, or PSA 10-20 ng/mL, and less than 50% of biopsy cores positive for carcinoma (i.e. for this trial, we will only include systematic biopsy cores, not targeted biopsy cores).
- Age \>=18 years.
- Eastern Cooperative Oncology Group (ECOG) performance status \<2 (Karnofsky \>60%).
- Eligible to undergo High dose rate (HDR) brachytherapy as monotherapy as determined by the treating radiation oncologist.
- Ability to understand and the willingness to sign a written informed consent document.
- Human immunodeficiency virus (HIV)-infected individuals on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial.
- For participants with evidence of chronic hepatitis B virus (HBV) infection, the HBV viral load must be undetectable on suppressive therapy, if indicated.
- Individuals with a history of hepatitis C virus (HCV) infection must have been treated and cured. For individuals with HCV infection who are currently on treatment, they are eligible if they have an undetectable HCV viral load.
- Individuals with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial.
- Willingness and ability to complete International Prostate Symptom Score questionnaires.
Age in the registry: 18 years to - · Sex: Male · Does not accept healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| University of California San Francisco Coordinator of this site? Confirm its status | San Francisco | United States | Recruiting |
This page is information, not medical advice. Discuss any trial with your doctor.