Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Endoscopic Evaluation of Late Rectal Injury Following CyberKnife Radiosurgery for Prostate Cancer

This study has been terminated.
(The study only accrued 4 patients in 2 years, far below target (40). It was closed with no subject reached the primary endpoint, thus no results to publish.)
Information provided by (Responsible Party):
Sean Collins, M.D., PhD, Georgetown University Identifier:
First received: June 12, 2012
Last updated: March 21, 2014
Last verified: March 2014

Radiation therapy is a well-established treatment modality for clinically localized prostate cancer. Men who choose to undergo radiation treatments for prostate cancer will have to live with the side effects for many years. Attempts have been made to protect surrounding tissues while delivering high dosage of radiation to cancer. With the rectum being so close to the prostate, many patients still suffer from side effects caused by radiation injury to the rectum, especially those who received conventional external beam radiotherapy.

CyberKnife is an FDA approved radiosurgical devise. Its flexible robotic arm allows radiation beams to be delivered in different directions, providing a highly conformal, uniform dose with steep dose gradients. Therefore, treatment with the CyberKnife radiosurgical system should minimize the toxicity to the surrounding structures. CyberKnife System also incorporates a dynamic tracking system to allow the robot to correct the targeting of therapeutic beams during treatment. These improvements allow for dose escalation within the prostate with less normal tissue toxicity.

The purpose of this study is to estimate the proportion of patients with endoscopically detectable telangiectasia as the indication of radiation injury to the rectum, after CyberKnife Treatment for prostate cancer.

Condition Intervention Phase
Stage II Prostate Carcinoma
Radiation: CyberKnife radiosurgery
Phase 2

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Prospective Endoscopic Safety Evaluation of Late Rectal Mucosal Injury Following CyberKnife Radiosurgery for Clinically Localized Prostate Cancer

Resource links provided by NLM:

Further study details as provided by Georgetown University:

Primary Outcome Measures:
  • Proportion of Patients With Endoscopically Detectable-telangiectasia (VRS Grade 1 or Higher). [ Time Frame: 7 years ]

    Telangiectasia is the primary outcome since it is a measure of tissue fribrosis (primary source of proctitis) and is a well-defined and measurable outcome.

    No patients had outcome before the trial was terminated.

Secondary Outcome Measures:
  • Proportion of Patients With Rectal Bleeding. [ Time Frame: 7 years ]
  • Progression-free Survival [ Time Frame: 7 Years ]
    Progression-free survival will be defined as the time in months from study entry until progression or death. Patients who are alive and free from progression on the date of closing follow-up will be censored on that date.

Enrollment: 4
Study Start Date: February 2011
Study Completion Date: December 2012
Primary Completion Date: December 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
CyberKnife Radiosurgery, Colonoscopy
CyberKnife radiosurgery for prostate cancer; bowel toxicity will be evaluated at 2 years by colonoscopy (lower endoscopy).
Radiation: CyberKnife radiosurgery

Treatment Planning:

Inverse planning using the CyberKnife planning system will be employed. The treatment plan used for each treatment will be based on an analysis of the volumetric dose including dose-volume histogram (DVH) analyses of the PTV and critical normal structures. The homogeneous CT model shall be used. Number of paths and beams used for each patient will vary and will be determined by the selected individual treatment plan. To reduce overall treatment time and total monitor units, 150-200 non-zero beams are recommended. No more than 250 beams shall be employed. Tuning structures shall be employed to minimize conformality index (CI) and new conformality index (nCI), preferably yielding values less than 1.20 and 1.25, respectively.

Detailed Description:

Radiation therapy is a well-established treatment modality for clinically localized prostate cancer. Current techniques include conventional external beam radiotherapy and intensity modulated radiation therapy (IMRT). The efficacy of conventional external beam radiation treatment (60-70 Gy in 2 Gy fractions) using several uniform fields has been documented. The 10-year disease-free survival rate for patients with disease confined to the prostate in the pre-PSA era was approximately 50-70%. Analysis of these data suggested that dose escalation could improve local control in prostate cancer.

On average, men who choose to undergo radiation therapy treatments for prostate cancer will have to live with the side effects of therapy for many years. Chronic proctitis may occur after radiotherapy (RT) to the pelvic region. According to a published series, it clinically occurs after radiation therapy of localized prostate cancer at a frequency of 5-20%. It occurs months to years after treatment (average 8-12 months) with a large majority within two years following radiation therapy. Patient characteristics, such as a history of inflammatory bowel disease or chronic anticoagulation therapy, may increase an individual patient's risk of clinically significant proctitis. Patients with radiation-induced proctopathy have described symptoms of rectal pain, diarrhea, urgency, rectal bleeding, and increased frequency of bowel movements. Endoscopic evaluation shows telangiectasia, congested mucosa and ulcers. Rectal bleeding occurs from the neovascular telangiectasia seen in about 60% of patients receiving conventionally fractionated radiation therapy. The other symptoms probably develop from the decreased rectal compliance associated with rectal wall fibrosis. These symptoms are, in current reports, most often classified according to the NCI Common Toxicity Criteria grade for late gastrointestinal side effects. Due to the proximity of the rectum and bladder to the prostate, using conventional techniques, the prescription dose is limited to 65-70 Gy. Although attempts were made to protect the rectum, the incidence of rectal bleeding was unacceptable at doses greater than 70 Gy (20%).

The risk of proctitis and rectal bleeding appeared to be dependent upon both the radiation dose and the volume of the rectum in the high dose area. Radiation Oncologists' efforts to optimize the therapeutic ratio for prostate cancer treatment have therefore been directed toward limiting the high dose volume to the prostate while escalation the dose within that volume. Intensity modulated radiation therapy (IMRT) is a widely used technology to achieve this goal. It is accomplished by modulating the radiation beam intensity within each radiation field in accordance with an optimization algorithm. This has allowed greater dose-escalation without evident increase in acute complications, although follow-up is too short to fully assess control and complication rates. Whether IMRT will provide a degree of conformity that proves to eradicate prostate cancer with a high probability while sparing local structures is as yet unresolved.

Late Rectal Mucosal Injury Following CyberKnife RadioSurgery for Clinically Localized Prostate Cancer. The type, extent and incidence of rectal mucosal injury following CyberKnife radiosurgery are currently unknown. The severity of clinical proctitis following radiation therapy is commonly documented using the NCI Common toxicity criteria/RTOG/EORTC. Unfortunately, clinical proctitis has a low sensitivity for detecting rectal mucosal injury. Endoscopy gives the most accurate estimate of the extent and incidence of rectal mucosal injury. The Vienna rectoscopy score (VRS) was developed to quantify rectal mucosal changes following radiation therapy. In this study, endoscopic evaluation of mucosal damage from CyberKnife treatment will be documented and correlated with gastrointestinal side effects and treatment planning parameters.


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

Inclusion Criteria:

  • Histologically confirmed adenocarcinoma of the prostate (Biopsy within one year of enrollment)
  • Signed Study-Specific Consent
  • PSA within 60 days of registration
  • Baseline AUA/ IPSS score of < 20
  • Candidate for screening colonoscopy
  • Pretreatment Colonoscopy/lower endoscopy done

Exclusion Criteria:

  • Prior pelvic radiotherapy
  • Prior radical prostate surgery
  • Recent (within 5 years) or concurrent cancers other than non-melanoma skin cancer
  • Implanted hardware adjacent to the prostate that would prohibit appropriate treatment planning and/or treatment delivery
  • Inflammatory bowel disease
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01618838

United States, District of Columbia
MedStar Georgetown University Hospital
Washington, District of Columbia, United States, 20007
Sponsors and Collaborators
Georgetown University
Principal Investigator: Sean P Collins, MD,PhD Georgetown University Hospital
  More Information

Responsible Party: Sean Collins, M.D., PhD, Assistant Professor, Georgetown University Identifier: NCT01618838     History of Changes
Other Study ID Numbers: IRB 2009-474
Study First Received: June 12, 2012
Results First Received: March 21, 2014
Last Updated: March 21, 2014

Keywords provided by Georgetown University:
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 April 24, 2017