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

NCT ID: NCT01618838

Last Updated: 2018-08-22

Basic Information

• Recruitment Status: TERMINATED
• Clinical Phase: NA
• Total Enrollment: 4 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2011-02-28
• Study Completion Date: 2012-12-31

Brief Summary

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.

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-Prostate Specific Antigen (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/Radiation Therapy Oncology Group/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.

Conditions

Stage II Prostate Carcinoma

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

CyberKnife Radiosurgery, Colonoscopy

CyberKnife radiosurgery for prostate cancer; bowel toxicity will be evaluated at 2 years by colonoscopy (lower endoscopy).

Group Type: OTHER

CyberKnife radiosurgery

Intervention Type: RADIATION

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 Planning Treatment Volume (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.

Interventions

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 Planning Treatment Volume (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.

Intervention Type: RADIATION

Eligibility Criteria

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 American Urological Association (AUA)/ International Prognostic Scoring System (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

• Minimum Eligible Age: 18 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: No

Sponsors

Georgetown University

OTHER

Sponsor Role: lead

Responsible Party

Sean Collins, M.D., PhD

Assistant Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Sean P Collins, MD,PhD

Role: PRINCIPAL_INVESTIGATOR

Georgetown University Hospital

Locations

MedStar Georgetown University Hospital

Washington, Virginia, United States

Countries

United States

Other Identifiers

IRB 2009-474

Identifier Type: -

Identifier Source: org_study_id