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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Date data sharing statement initially provided
Type of registration
Prospectively registered

Titles & IDs
Public title
A preliminary study of the addition of prazosin to radiotherapy in men with prostate cancer
Scientific title
A feasibility study of the repurposing of prazosin to improve treatment outcomes in men receiving radiotherapy for prostate cancer (MiniRaP-00)
Secondary ID [1] 304161 0
Nil known
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Prostate Cancer 321855 0
Condition category
Condition code
Cancer 319582 319582 0 0

Study type
Description of intervention(s) / exposure
This feasibility study will require men with non-metastatic prostate cancer to take prazosin concurrently with external beam radiotherapy. All participants will commence prazosin at 0.5mg orally twice daily the week before the commencement of radiotherapy and the dose will increase weekly to 5mg twice daily or a maximum tolerated dose, which ever occurs first. If a participant experiences a grade 2 or higher toxicity associated with prazosin, as assessed by PI and weekly review, they will return to the previous dose level and this will be defined as the maximum tolerated dose.
Dose titration will schedule will be:
Week 0 - 0.5 mg twice daily
Week 1 - 1mg twice daily
Week 2 - 2mg twice daily
Week 3 - 3mg twice daily
Week 4 - 4mg twice daily
Week 5 - 5 mg twice daily
Participants will cease taking prazosin after 6 weeks of prazosin treatment or the completion of radiotherapy, whichever occurs last. Prazosin tablets will be taken orally.
Compliance will be assessed at weekly review by the returning of all medication packaging and unused tablets. Participants will also be required to complete a dosing diary for the duration of treatment.
Intervention code [1] 320493 0
Treatment: Drugs
Comparator / control treatment
Control group

Primary outcome [1] 327438 0
Protocol and treatment schedule compliance as a composite outcome. Compliance feasibility will be defined as = 80% compliance rate to the study protocol/treatment schedule. Treatment compliance will be defined as participants missing < 10% of prazosin doses and being able to complete all radiotherapy fractions. Treatment compliance will be assessed using participant dosing diaries and the return of medication packaging and unused tablets. Assessment compliance will be defined as a completion of = 80% required assessments.
Timepoint [1] 327438 0
At the completion of radiotherapy and prazosin treatment.
Secondary outcome [1] 395128 0
PSA Kinetics - PSA kinetics will be measured by the calculation of PSA velocity and PSA doubling time as a composite outcome. Analysis of PSA kinetics will provide data on short-term efficacy of the addition of prazosin to radiotherapy. PSA kinetics will be measured using PSA levels taken at three, six and nine months post radiotherapy. PSA velocity and PSA doubling time will be calculated using regression models. PSA values will be retrieved from standard of care blood test post radiotherapy.
Timepoint [1] 395128 0
At 12, 24 and 36 weeks post radiotherapy.
Secondary outcome [2] 395129 0
Chemical or biochemical progression free survival - Clinical or biochemical progression free survival is defined as the time from the start of prazosin to the date of first clinical or biochemical evidence of disease progression or recurrence or death from any cause, whichever comes first.
Clinical evidence of disease progression or recurrence includes imaging (CT/MRI or whole-body radioisotope bone scan), pathology indicative of biochemical relapse, presentation of symptoms attributable to disease progression or recurrence or commencement of other anticancer treatment for prostate cancer.
Timepoint [2] 395129 0
At completion of 12 month follow-up period.
Secondary outcome [3] 395130 0
Adverse events - The National Cancer Institute (NCI) Common Terminology for Adverse Events (CTCAE) V5.0 will be used to classify and grade any adverse events occurring up to 30 days after the last dose of the study drug.
The RTOG/EORTC toxicity criteria will be used to assess morbidities related to radiotherapy. Radiation toxicity will be defined as either acute or late. Acute toxicities are defined as those occurring within 12 weeks of the commencement of radiotherapy and scored according to the RTOG/EORTC Acute Radiation Morbidity Scoring Criteria. Late toxicities will be defined as those that occur more than 12 weeks after the commencement of radiotherapy and will be classified by the RTOG/EORTC Late Radiation Morbidity Scoring Schema.
Timepoint [3] 395130 0
Weekly during treatment, at completion of radiotherapy and prazosin treatment and at 12, 24, and 36 weeks post radiotherapy.
Secondary outcome [4] 395131 0
Maximum tolerated dose of prazosin - This study will be used to determine the maximum tolerated dose of prazosin when used in conjunction with radiotherapy for the treatment of prostate cancer. This dose will be determined based on the ability of participants to complete the planned prazosin dose titration schedule using a participant dosing diary and assessment of compliance of the returned of unused tablet at weekly reviews . If all participants are able to tolerate the ceiling dose of 5mg twice daily, this dose will be defined as the maximum tolerated dose.
Timepoint [4] 395131 0
At completion of prazosin treatment for all participants.

Key inclusion criteria
Histologically confirmed adenocarcinoma of the prostate
- Age greater or equal to 18 years
- Normal bone marrow function: Hb greater than or equal to 100 g/L, WCC greater than or equal to 4.0 x 109 cells/L, Platelets greater than or equal to 100 x 10^9 cells/L
- Normal liver function: ALT <2x ULN, Bilirubin <1.5 x ULN or normal conjugated bilirubin
- Normal renal function: Calculated creatinine clearance >40 mL/min using Cockcroft-Gault formula
- ECOG performance status of 0-1
- Participants capable of childbearing only if using adequate contraception
- Willingness to comply with all study procedures including IP administration protocol and required testing
- Signed, written and informed consent
- Participants are available for follow up
Minimum age
18 Years
Maximum age
No limit
Can healthy volunteers participate?
Key exclusion criteria
- Evidence of >5 metastatic sites: Suspected or confirmed by appropriate imaging.
- Under the age of 18 years
- Presence of any medical, psychological or social condition that may hinder compliance
- Use of hormonal therapy more than 30 days prior to commencement of prazosin, other than ADT prescribed for the treatment of PCa
- History of any other previous malignancy within 5 years of the commencement of prazosin, other than successfully treated squamous cell or basal cell carcinoma of the skin
- Previous bilateral orchidectomy
- Has received prior brachytherapy or radiotherapy for PCa to the same site
- Planned treatment with brachytherapy
- Planned treatment with stereotactic ablative body radiotherapy (SABR)
- Pre-existing hypotension defined as: Seated blood pressure < 100 mmHg systolic and/or < 70 mmHg diastolic
- Pre-existing orthostatic hypotension defined as: Decrease in systolic blood pressure of 20 mm Hg or a decrease in diastolic blood pressure of 10 mm Hg within three minutes of standing when compared with seated blood pressure
- Allergy to quinazolines
- Treatment with a1-antagonists with the last 6 months: Including all drugs within the class e.g. tamsulosin, silodosin, doxazosin, alfuzosin and prazosin
- Pre-existing cataract disease
- Patients are high falls risk as assessed by physician
- Planned cataract surgery
- Concurrent participation in other clinical trials or use of other investigational products
- Known gastrointestinal disease that could affect the absorption or tolerance of the IP

Study design
Purpose of the study
Allocation to intervention
Non-randomised trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?

Intervention assignment
Single group
Other design features
Phase 1
Type of endpoint(s)
Statistical methods / analysis

Recruitment status
Not yet recruiting
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)
Recruitment hospital [1] 19343 0
Genesis Cancer Care - Southport - Southport
Recruitment hospital [2] 19344 0
Genesis Cancer Care - Tugun - Tugun
Recruitment postcode(s) [1] 33926 0
4215 - Southport
Recruitment postcode(s) [2] 33927 0
4224 - Tugun

Funding & Sponsors
Funding source category [1] 308533 0
Name [1] 308533 0
GenesisCare Foundation
Address [1] 308533 0
Building 1, The Mill, 41-43 Bourke Road, Alexandria NSW 2015
Country [1] 308533 0
Funding source category [2] 308542 0
Name [2] 308542 0
Griffith University
Address [2] 308542 0
1 Parklands Drive, Southport, QLD, 4215
Country [2] 308542 0
Primary sponsor type
Buildings 1&11, The Mill, 41-43 Bourke Road, Alexandria, NSW, 2015.
Secondary sponsor category [1] 309392 0
Name [1] 309392 0
Address [1] 309392 0
Country [1] 309392 0
Other collaborator category [1] 281774 0
Name [1] 281774 0
Griffith University
Address [1] 281774 0
1 Parklands Drive, Southport, QLD, 4215
Country [1] 281774 0
Other collaborator category [2] 281775 0
Commercial sector/Industry
Name [2] 281775 0
Ramsay Pharmacy
Address [2] 281775 0
Level 2, 479 St Kilda Road, Melbourne Vic 3004
Country [2] 281775 0
Other collaborator category [3] 281776 0
Name [3] 281776 0
Bond University
Address [3] 281776 0
14 University Drive, Robina, QLD, 4226
Country [3] 281776 0

Ethics approval
Ethics application status
Ethics committee name [1] 308488 0
Ramsay Health Care Qld HREC, Greenslopes Private Hospital
Ethics committee address [1] 308488 0
Greenslopes Private Hospital, Newdegate Street, Greenslopes, Qld, 4120
Ethics committee country [1] 308488 0
Date submitted for ethics approval [1] 308488 0
Approval date [1] 308488 0
Ethics approval number [1] 308488 0

Brief summary
The purpose of this study is determine whether it is possible to use a drug called prazosin when men are undergoing radiotherapy for the treatment of prostate cancer.

Who is it for?

You may be eligible for this study if you are an adult man who has been diagnosed with non-metastatic prostate cancer.

Study details

All participants in this study will be asked to take prazosin two times day starting the week before and until the completion of their radiotherapy treatment for prostate cancer. The dose of medication provided will increase week by week until the final week.

Participants will be monitored throughout the treatment period to determine if they are willing to take the medication alongside their radiation, and followed for 9 months for any side effects.

Participants will also be asked to provide blood samples at 3, 6 and 9 months after commencing the study, however these are part of standard follow-up tests after radiotherapy for prostate cancer.

It is hoped that this study will help determine if it is possible to use prazosin while participants are completing radiotherapy, and help guide the development of a large scale clinical trial which will be used to investigate the efficacy of prazosin combined with radiotherapy
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 110874 0
Prof David Christie
Address 110874 0
GenesisCare Tugun, 42 Inland Drive, Tugun, QLD, 4224
Country 110874 0
Phone 110874 0
Fax 110874 0
Email 110874 0
Contact person for public queries
Name 110875 0
Mr Liam King
Address 110875 0
Ramsay Pharmacy John Flynn Hospital, Level 1, 42 Inland Drive, Tugun, QLD, 4224
Country 110875 0
Phone 110875 0
+61 755989155
Fax 110875 0
Email 110875 0
Contact person for scientific queries
Name 110876 0
Mr Liam King
Address 110876 0
Ramsay Pharmacy John Flynn Hospital, Level 1, 42 Inland Drive, Tugun, QLD, 4224
Country 110876 0
Phone 110876 0
+61 755989155
Fax 110876 0
Email 110876 0

Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No/undecided IPD sharing reason/comment
What supporting documents are/will be available?
No other documents available
Summary results
No Results