Stereotactic Body Radiation Therapy (SBRT) for Prostate Cancer

Stereotactic Body Radiation Therapy (SBRT) for the Management of Carcinoma of the Prostate: Quality of Life Data After Primary Stereotactic Body Radiation Therapy for Localized Prostate Cancer

The purpose of this study is to learn the long term efficacy and side effects associated with utilizing Stereotactic Body Radiation Therapy (SBRT) radiation for prostate cancer utilizing the Elekta Versa or Agility System. SBRT uses advanced imaging techniques to deliver targeted radiation to a tumor. The Elekta Versa and Agility Systems are approved by the Food and Drug Association (FDA) for SBRT treatment of cancer.

Traditional External beam radiation therapy (EBRT) for prostate carcinoma is typically done over the course of approximately 42-45 daily treatments SBRT is a way to condense this treatment into a course of 5 treatments, delivering more dose per day.

Study Overview

• Status: Active, not recruiting
• Conditions: Prostate Cancer
• Intervention / Treatment: Radiation: Stereotactic Body Radiation Therapy (SBRT) radiation for prostate cancer utilizing the Elekta Versa or Agility System.

Detailed Description

Prostate cancer is the most common cancer diagnosed in men, and ranks second in estimated deaths. The current standard of care for localized prostate cancer consists of observation, surgery or radiation therapy. From a radiation perspective, accepted options include external beam radiation therapy, brachytherapy, or a combination of those. Acceptable external beam radiation options are further defined as conventionally fractionated (over approximately 8-9 weeks), or moderately hypo-fractionated (over approximately 4-6 weeks).

Stereotactic body radiation therapy (SBRT) is a newer technique, allowing treatment to be delivered in an extremely hypo-fractionated regimen (i.e. in 5 fractions). Current consensus guidelines describe SBRT as "a cautious alternative to conventionally fractionated regimens at clinics with appropriate technology, physics, and clinical expertise."

The goal of any therapy is to maximize the effect of that treatment on cancer cells and minimize any effect on normal tissue. In radiation therapy, this is mainly done through dose targeting (i.e. limiting the radiation dose to the targets and minimizing dose to normal surrounding organs). Advancements in radiation therapy have allowed for better targeting, resulting in shrinking margins of treatment around cancer cells.

The therapeutic window can also be optimized through the use of fractionation (i.e. amount of dose delivered per day) in radiation therapy. Since cancerous and normal tissue cells respond differently to changes in fractionation, the therapeutic window could theoretically be improved by choosing a fractionation pattern to which cancer cells are more sensitive. Historical generalizations put cancer cells into the category of early responding tissues, which would make them more sensitive to cell death when radiation is delivered in a protracted fractionation pattern, such as over 8-9 weeks of radiation therapy.

However, studies have emerged which suggest that prostate cancer is unlike other cancers and reactive more like late responding tissues. With that in mind, prostate cancer cells could be more sensitive to high doses per fraction, which could provide a radiobiological advantage and a greater therapeutic window with the use of SBRT.

Very promising early results utilizing SBRT for prostate cancer treatment have been described in the literature, and multiple ongoing phase 3 trials are underway.

Aside from a potential therapeutic advantage, SBRT also offers a more cost effective solution to patients with prostate cancer, with less impact on their daily lives (only needing to come in for 5 treatments instead of 40-45 treatments).

Much of the literature on SBRT has been done utilizing the CyberKnife system. But the Elekta Versa HD and Agility Systems available at Hoag provides a unique opportunity for faster treatment delivery and 4D imaging during treatment. The Elekta Versa HD and Agility systems are approved by the FDA for SBRT treatment of cancer.

This study seeks to investigate biochemical failure rates for patients treated with SBRT utilizing Elekta machines, as well as obtain quality of life data and assess the intrafraction motion in approximately 15 patients for 5 years following SBRT.

• Study Type: Interventional
• Enrollment (Estimated): 100
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • California
    • Irvine, California, United States, 92618
      • Hoag Memorial Hospital Presbyterian

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Histologically confirmed diagnosis of adenocarcinoma of the prostate History/physical examination with digital rectal examination of the prostate
• Histological evaluation of prostate biopsy with assignment of Gleason score to the biopsy material.
• Clinical stage T1-3 (AJCC 7th edition).
• Males age ≥ 18
• Patient must be able to provide study-specific informed consent prior to study entry.
• Willingness and ability to complete the Expanded Prostate Cancer Index Composite (EPIC) questionnaire

Exclusion Criteria:

• Evidence of distant metastases
• Regional lymph node involvement
• Previous radical surgery (prostatectomy), cryosurgery, or HIFU for prostate cancer
• Previous pelvic irradiation, prostate brachytherapy
• Previous or concurrent cytotoxic chemotherapy for prostate cancer

There are no exclusions due to co-morbid disease or illnesses except for patients with severe inflammatory bowel disease

No life expectancy restrictions will apply

Performance Status will not be considered

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Elekta Versa HD; This study seeks to investigate biochemical failure rates for patients treated with SBRT utilizing Elekta machines, as well as obtain quality of life data and assess the intrafraction motion in approximately 15 patients for 5 years following SBRT.	Radiation: Stereotactic Body Radiation Therapy (SBRT) radiation for prostate cancer utilizing the Elekta Versa or Agility System.; SBRT uses advanced imaging techniques to deliver targeted radiation to a tumor. The Elekta Versa and Agility Systems are approved by the Food and Drug Association (FDA) for SBRT treatment of cancer.; Other Names: Cyberknife
Other: Agility Systems; This study seeks to investigate biochemical failure rates for patients treated with SBRT utilizing Agility Systems, as well as obtain quality of life data and assess the intrafraction motion in approximately 15 patients for 5 years following SBRT.	Radiation: Stereotactic Body Radiation Therapy (SBRT) radiation for prostate cancer utilizing the Elekta Versa or Agility System.; SBRT uses advanced imaging techniques to deliver targeted radiation to a tumor. The Elekta Versa and Agility Systems are approved by the Food and Drug Association (FDA) for SBRT treatment of cancer.; Other Names: Cyberknife

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The primary aim of this study is to examine biochemical failure rates after SBRT for patients with low, intermediate, and high risk localized non-metastatic prostate cancer.	The number of patients demonstrating biochemical failure will be assessed. Biochemical failure will be defined using the Phoenix definition (Roach et al. IJROBP 2006), which is defined as a rise above nadir PSA + 2 ng/ml.	5 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
The secondary aim is to obtain quality of life data to examine the potential complications associated with SBRT: detailed symptom questionnaire	Expanded Prostate Cancer Index Composite for Clinical Practice (EPIC-CP) (Chang J Urol 2011) total symptom score change from baseline will be assessed. This total score ranges from 0-60, with higher scores representing more symptoms.	5 years

Collaborators and Investigators

• Sponsor: Hoag Memorial Hospital Presbyterian

Study record dates

Study Major Dates

• Study Start (Actual): October 21, 2016
• Primary Completion (Actual): December 31, 2023
• Study Completion (Estimated): December 31, 2025

Study Registration Dates

• First Submitted: March 19, 2019
• First Submitted That Met QC Criteria: March 21, 2019
• First Posted (Actual): March 26, 2019

Study Record Updates

• Last Update Posted (Estimated): September 15, 2025
• Last Update Submitted That Met QC Criteria: September 8, 2025
• Last Verified: March 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Urogenital Diseases; Genital Diseases; Genital Neoplasms, Male; Urogenital Neoplasms; Neoplasms by Site; Neoplasms; Genital Diseases, Male; Prostatic Diseases; Male Urogenital Diseases; Prostatic Neoplasms; Investigative Techniques; Therapeutics; Surgical Procedures, Operative; Physical Phenomena; Radiotherapy; Stereotaxic Techniques; Neurosurgical Procedures; Radiation; Radiosurgery
• Other Study ID Numbers: 115-16-CA

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: Yes
• product manufactured in and exported from the U.S.: No