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Hypofractionated Accelerated Radiotherapy for Low Risk Localized Prostate Cancer (pHART3)

This study has been completed.
Canadian Association of Radiation Oncology
Information provided by (Responsible Party):
Sunnybrook Health Sciences Centre Identifier:
First received: October 31, 2011
Last updated: December 19, 2014
Last verified: December 2014
The purpose of this study is to determine the safety and efficacy of a short course of radiotherapy (35 Gy / 5 fractions / 29 days) for the treatment of low-risk prostate cancer.

Condition Intervention Phase
Prostate Cancer
Radiation: Hypofractionated radiotherapy
Phase 1
Phase 2

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Hypofractionated Accelerated Radiotherapy for Low Risk Localized Prostate Cancer (pHART 3)

Resource links provided by NLM:

Further study details as provided by Sunnybrook Health Sciences Centre:

Primary Outcome Measures:
  • Incidence of grade 3+ rectal toxicity [ Time Frame: Acute period (up to 6 months) ]
    Common Terminology Criteria for Adverse Events (CTCAE) v3.0

Secondary Outcome Measures:
  • Incidence of grade 3+ urinary toxicity [ Time Frame: Acute (up to 6 months) and Late (6 months and after) ]
    Common Terminology Criteria for Adverse Events (CTCAE) v3.0

  • Incidence of grade 3+ rectal and urinary toxicity [ Time Frame: Late (6 months and after) ]
    Common Terminology Criteria for Adverse Events (CTCAE) v3.0

  • Quality of Life [ Time Frame: up to 5 years ]
    Expanded Prostate Cancer Index Composite (EPIC)

  • Biochemical (ie. prostate specific antigen) disease free survival [ Time Frame: 5 year ]
  • Biopsy positive rate [ Time Frame: 3 year ]

Enrollment: 84
Study Start Date: October 2006
Study Completion Date: April 2013
Primary Completion Date: April 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Hypofractionated radiation
35 Gy in 5 fractions of image-guided intensity modulated radiotherapy (IGRT) delivered over 29 days.
Radiation: Hypofractionated radiotherapy
35Gy/5 fractions/29 days
Other Name: standard linear accelerator delivery

Detailed Description:

Rationale for Proposed Study With the availability of intensity modulated radiotherapy (IMRT) at the Odette Cancer Centre (OCC), there is an opportunity to explore the use of a much more intensive hypofractionation schedule for prostate cancer. Using an alpha/beta ratio of 1.3, a dose of 35 Gy in 5 fractions would be equivalent to 88 Gy delivered in 2 Gy fractions. For normal tissues (alpha/beta value of 2), this would be equivalent to 78 Gy in 2 Gy fractions. As such, the linear quadratic equation predicts that 35 Gy in 5 fractions should not result in any increased late toxicity for normal tissues compared to standard dose escalated radiotherapy. However, the biological dose to the prostate cancer would be significantly increased. As a safety precaution for this study proposal, the investigators propose to deliver 35 Gy in 5 fractions over 5 weeks (one radiotherapy fraction of 7 Gy per week) to allow for normal tissue repair.

With IMRT, it is expected that there will be superior conformality of the high dose region around the target volume. As well, the use of daily on-line imaging will allow us to eliminate interfraction prostate motion errors and use tighter planning target volume margins for any residual intrafraction motion. At OCC, such an approach has already been shown to be feasible and is currently employed in the phase 1/2 concomitant boost study for high risk prostate cancer.

If proven to be safe and effective, such a hypofractionated radiotherapy schedule may have significant practical advantages as well. With only 1 fraction of radiotherapy delivered each week (for a total of 5 weeks), there are huge savings in resource utilization and increased convenience for patients.

The investigators propose to start a small phase 1 study to explore the use of this dose fractionation for men with low risk prostate cancer. The primary endpoint for this small pilot study would be acute and late normal tissue toxicities. If proven to be feasible and safe, external peer-reviewed funding will be sought to further explore this novel treatment schedule in a larger phase 2 setting.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Informed consent signed (Appendix A)
  • Adult men greater than 18 years of age
  • Histologically confirmed diagnosis of adenocarcinoma of the prostate (centrally reviewed).
  • Clinical stage T1-T2b, Gleason Score < 6, and PSA < 10 ng/mL
  • Less than 50% of biopsy cores +ve for cancer
  • Less than 50% overall surface area involved with cancer
  • Neoadjuvant hormone suppression therapy is allowed. However, PSA, must have been performed within 2 months of starting androgen suppression therapy. If androgen suppression therapy has been started LHRH agonist must be continued for a minimum of 3 months before initiation of gold fiducial marker insertion & radiotherapy planning.

Exclusion Criteria:

  • Prior pelvic radiotherapy.
  • Concurrent anticoagulation medication (if it is unsafe to discontinue for gold seed insertion)
  • Diagnosis of bleeding diathesis
  • Presence of a hip prosthesis
  • Pelvic girth >40cm (to ensure visibility of gold seeds on electronic portal imaging device)
  • Large prostate (> 60 cm3) on imaging
  • Severe lower urinary tract symptoms (International Prostate Symptom Score > 15 or nocturia > 3)
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Please refer to this study by its identifier: NCT01578902

Canada, Ontario
Sunnybrook Health Sciences Centre
Toronto, Ontario, Canada, M4N 3M5
Sponsors and Collaborators
Sunnybrook Health Sciences Centre
Canadian Association of Radiation Oncology
Principal Investigator: Andrew Loblaw, MD Sunnybrook Health Sciences Centre
Principal Investigator: Patrick Cheung, MD Sunnybrook Health Sciences Centre
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Sunnybrook Health Sciences Centre Identifier: NCT01578902     History of Changes
Other Study ID Numbers: 1002-2006
Study First Received: October 31, 2011
Last Updated: December 19, 2014

Keywords provided by Sunnybrook Health Sciences Centre:
Prostatic Neoplasms
Low Risk Prostate Cancer

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Genital Diseases, Male
Prostatic Diseases processed this record on May 25, 2017