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Human collagen injections to reduce rectal dose during radiotherapy
William R Noyes1, Charles C Hosford, Steven E Schultz
1Department of Radiation Oncology, Cancer Center of North Dakota, Grand Forks, ND, USA. noyes@cancercenternd.com
Summary
Human collagen injections create space between the prostate and rectum, significantly reducing radiation dose during intensity-modulated radiotherapy (IMRT) for prostate cancer. This method was well-tolerated and prevented rectal toxicities.
Area of Science:
- Oncology
- Radiation Oncology
- Surgical Innovation
Background:
- Rectal toxicities are a significant concern in prostate cancer radiation therapy.
- Minimizing radiation dose to the rectum is crucial for improving patient outcomes.
- Novel techniques are needed to enhance rectal sparing during radiotherapy.
Purpose of the Study:
- To evaluate the safety and efficacy of human collagen injection for rectal wall displacement.
- To assess the reduction in rectal radiation dose achieved by creating prostatic-rectal separation.
- To determine the tolerability and durability of the collagen implant.
Main Methods:
- A pilot study involving transperineal injection of 20 mL human collagen into the perirectal space.
- Intensity-modulated radiotherapy (IMRT) planning was performed pre- and post-injection.
- Radiation dose to the rectum was calculated, and CT scans assessed collagen absorption over 12 months.
Main Results:
- Human collagen injection was well-tolerated in an outpatient setting.
- Mean prostate-rectum separation increased to 12.7 mm.
- Mean rectal wall radiation dose decreased by 50% with no reported rectal symptoms.
Conclusions:
- Transperineal injection of human collagen is a safe and effective method for rectal wall displacement.
- This technique significantly reduces rectal radiation dose during IMRT for prostate cancer.
- The procedure is well-tolerated and associated with no rectal toxicities.
