October 27, 2016 — Augmenix Inc. announced the three-year results from the SpaceOAR System Prostate Cancer US Pivotal Clinical Trial in September at the 2016 annual meeting of the American Society for Radiation Oncology (ASTRO).
The study results, presented by Daniel Hamstra, M.D., Ph.D., a radiation oncologist at Texas Oncology in Irving, Texas, demonstrated significantly lower rectal toxicity and higher patient quality of life (QOL) scores when the SpaceOAR System was applied prior to radiotherapy as compared to the trial control patients.
The leading side effects of prostate cancer radiotherapy are collectively known as “rectal toxicity” (diarrhea, rectal bleeding, urgency, pain, etc.), which results from unintended radiation injury to the rectum (the Organ At Risk, OAR). These complications can last for years, significantly impacting QOL. The SpaceOAR System was developed to push the rectum away from the high dose region during treatment, and then to be completely absorbed by the body after radiotherapy is complete.
The prospective, randomized, multi-center, patient-blinded clinical trial evaluated rectal and urinary toxicity and QOL impact on prostate radiotherapy patients treated either with SpaceOAR hydrogel, or with no hydrogel (controls). Previously published initial study results demonstrated spacer safety, and a significant 74 percent reduction in the volume of rectum receiving 70 Gy radiation at 15 months.
Following radiotherapy through three years, no SpaceOAR patients (0 percent) experienced grade 2 or worse late rectal toxicity, compared to 5.7 percent in the control patients (p=0.012). Additionally, at three years the average SpaceOAR patient bowel QOL was slightly better than before radiotherapy (+0.48 points), while the control patients QOL had significantly declined (-5.3 points, p=0.05). The percent of men with significant 10+ declines in bowel QOL at three years was 20.5 percent and 5.4 percent in the control and SpaceOAR groups (p=0.02), respectively.
Unexpectedly, the SpaceOAR patients also showed benefits in urinary complications and QOL, relative to controls. In the three years after radiotherapy, grade 1 urinary incontinence was experienced in 19.6 percent and 4.3 percent of the control and SpaceOAR patients, respectively (p=0.003). Additionally, like bowel QOL, at three years the average SpaceOAR patient urinary QOL was slightly better than before radiotherapy (+0.6 points), while the control patient QOL had declined (-3.3 points, p=0.05).
“The low level of rectum radiation dose seen in the men who received the spacer in this trial is unprecedented, and it is great to see that the spacer rectum protection is resulting in long-term patient benefits,” said Hamstra. “The idea that three years after treatment patients can be having the same bowel and urinary QOL is wonderful. Essentially patients can complete their treatment and be confident that life can return to normal.”
Using a minimally invasive procedure, the SpaceOAR System is injected as a liquid into the space between the prostate and rectum, where it expands the space and then solidifies into a soft hydrogel. The hydrogel remains stable for three months while protecting the rectum during radiotherapy, and then liquefies and is completely absorbed.
The SpaceOAR System is U.S. Food and Drug Administration (FDA)-cleared, CE marked and is also approved in Australia and Canada.
For more information: www.augmenix.com