Improving Sexual Quality of Life - Randomized Trial of Two vs Five MRI Guided SABR Treatments for Prostate Cancer

Prostate Cancer Clinical Trial

— iSMART  

Official title:

Improving Sexual Quality of Life - A Phase 2 Randomized Controlled Trial of Two Versus Five Stereotactic MRI-Guided Ablative Radiotherapy Treatments for Prostate Cancer

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT05600400
• Other study ID #: iSMART
• Status: Recruiting
• Phase: N/A
• Start date: March 1, 2024
• Est. completion date: June 2029

Study information

• Verified date: April 2024
• Source: Sunnybrook Health Sciences Centre
• Contact: Danny Vesprini, MD
• Phone: 416-480-6100
• Email: Danny.Vesprini[@]sunnybrook.ca
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Prostate Stereotactic ablative body radiotherapy (SABR) is an established technique that delivers radiation in a non-invasive approach for men with prostate cancer. The treatment regimen is given in total of 5 fractions with one treatment per day at every other day or weekly sessions. Ultra-hypofractionated radiotherapy (UHRT) is an emerging monotherapy for localized prostate cancer however, several trials have observed demonstrating superior biochemical control of a two-fraction (HDR) over single-fraction approach. The study aims to compare an experimental shorter course of prostate ultra-hypofractionated radiotherapy (UHRT) that will deliver what is expected to be an equivalent amount of radiation as given in the standard 5 treatment regimen. UHRT is given in 2 treatments with one treatment a week for 2 consecutive weeks.

Description:

Ultra-hypofractionated radiotherapy (UHRT) is an emerging monotherapy for localized prostate cancer. From a radiobiological standpoint, fewer fractions and higher doses per fraction takes greater advantage of the low α/β ratio of prostate cancer to improve the therapeutic ratio, most recently estimated at 1.6 based on 14 randomized controlled trials.Highly conformal delivery of large doses per fraction can be achieved with either high dose rate (HDR) brachytherapy or with stereotactic ablative radiotherapy (SABR).

Several trials have explored HDR as monotherapy, from 6-fractions to a single-fraction approach. Sunnybrook recently published a randomized trial of HDR monotherapy demonstrating superior biochemical control of a two-fraction over single-fraction approach. These and other data have informed the design of a phase III randomized controlled trial comparing two-fraction HDR monotherapy to low dose rate (LDR) brachytherapy in patients with intermediate risk prostate cancer (NCT02960087) coordinated by the Canadian Clinical Trails Group (PR19). The investigators have shown that 2 fraction SABR has equivalent efficacy and tolerability to 2 fraction HDR but SABR does not require general anesthesia, is less invasive and cheaper.

UHRT is also supported by phase III data, including a large non-inferiority randomized trial (HYPO-RT-PC) demonstrating similar biochemical control with a 7-fraction versus conventionally-fractionated regimen. The non-inferiority PACE-B trial comparing 5-fraction SABR to conventionally-fractionated or moderately hypofractionated RT has demonstrated similar acute toxicity with use of contemporary SABR planning techniques. Sunnybrook has also conducted several iterative clinical trials testing increasingly hypofractionated external beam radiotherapy. The investigators observed in parallel cohort studies that 5 fractions of UHRT and 2 fractions of UHRT with a patented immobilization device (GU-Lok) had equal effectiveness but better tolerability with the 2 fraction technique. As this was a post hoc analysis, this study aims to validate those findings.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 144
• Est. completion date: June 2029
• Est. primary completion date: January 2029
• Accepts healthy volunteers: No
• Gender: Male
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. Histologically confirmed prostate adenocarcinoma (centrally reviewed)

2. Low or favorable intermediate risk disease. Patient must meet one of the following categories:

• Low risk - T1-T2b, grade group 1, AND PSA < 10 ng/ml;

• Favorable risk

1. Only one of the following intermediate risk factors - cT2c, grade group 2, or PSA 10-20 ng/ml; or

2. Grade group 3 AND PSA < 20, AND <cT2c AND absolute percentage pattern 4/5 is <10%

Exclusion Criteria:

1. Androgen deprivation therapy (LHRH-agonists or antiandrogens) given or planned

2. Prior pelvic radiotherapy

3. Anticoagulation medication (if unsafe to discontinue for gold seed insertion)

4. Diagnosis of bleeding diathesis

5. Large prostate (>90cm3) on imaging

6. Immunosuppressive medications

7. Inflammatory bowel disease

8. Presence of dual hip prostheses

9. Contraindications to having MRI

Related Conditions & MeSH terms

• Cancer of Prostate
• Prostate Adenocarcinoma
• Prostate Cancer
• Prostatic Neoplasms

Intervention

Radiation:
• Stereotactic Ablative Body Radiation
2 Fraction

Locations

Country	Name	City	State
Canada	Sunnybrook Health Sciences Centre	Toronto	Ontario

Sponsors (2)

Lead Sponsor	Collaborator
Sunnybrook Health Sciences Centre	Prostate Cure Foundation

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Prostate Cancer Patient's Quality of Life Function will be measured to determine change in Quality of life function from baseline to 5 years beyond treatment.	Expanded Prostate Cancer Index Composite questionnaires will be scored and analyzed to determine change in Quality of life function from baseline	Change in patient Quaity of Life will be asseses from Before treatment (Baseline); week 1, 4 and 13; month 6 and every 6 months for 5 years
Secondary	Toxicity in patients	Incidence of acute Gastrointestinal (GI) and Genitourinary (GU) complications using CTCAE v4	Before treatment (Baseline); week 1, 4 and 13; month 6 and every 6 months for 5 years
Secondary	Proportion of patients with 4 year PSA value of <0.4 ng/ml	Proportion of patients with 4 year PSA value of <0.4 ng/ml	Before treatment (Baseline); months 3 and 6; and every 6 months for 5 years
Secondary	Biochemical Control in Prostate Patients	5 year biochemical failure rates using Phoenix definition (as nadir PSA +2ng/mL)	Before treatment (Baseline); months 3 and 6; and every 6 months for 5 years
Secondary	Salvage Therapy Rate	Analysis of prostate patients requiring salvage treatment using Androgen Deprivation Therapy, surgery or brachytherapy	5 years
Secondary	Health Utilities Outcome	Analysis of patient reported outcome using EQ-5D-5L	5 years
Secondary	Health Utilities Outcome	Analysis of patient reported outcome using PORPUS-U	5 years