Publications

Publications

Comparison of low and intermediate source strengths for (125)I prostate brachytherapy implants.

By:
Contributors: Nawaid Usmani, MD, FRCPC, Sunita Ghosh, PhD
Brachytherapy. 2013 Sep-Oct;12(5):442-8. doi: 10.1016/j.brachy.2013.02.004. Epub 2013 May 23.

Abstract

PURPOSE:

To compare the implant quality and clinical outcomes for patients treated with low and intermediate strength (125)I seeds in prostate brachytherapy implants.

METHODS AND MATERIALS:

This retrospective review included 390 consecutive patients treated with prostate brachytherapy from 1999 to 2006. The first 142 patients were implanted with source strengths lower than 0.415U (0.327mCi), with the subsequent 248 patients implanted with source strengths higher than 0.493U (0.388mCi). Clinical, dosimetric, toxicity, and outcome data were compared between these two cohorts of patients.

RESULTS:

Despite having similar prostate volumes, fewer sources (median, 95 vs. 113; p<0.0001) and fewer needles (median, 23 vs. 29; p<0.0001) were implanted in the intermediate strength cohort. The postimplant dosimetry demonstrated better quality implants in patients treated with intermediate strength sources (median D90, 160.0Gy vs. 139.6Gy; p<0.0001), with greater dose inhomogeneity identified in the intermediate strength cohort of patients. A higher incidence of late rectal toxicity was identified in patients treated with intermediate strength sources despite lower rectal doses in this cohort. The biochemical relapse-free survival, prostate cancer survival, and overall survival were not significantly different between the two cohorts.

CONCLUSIONS:

The transition from low to intermediate strength sources has led to fewer resources being used and improved postoperative dosimetry. Although there were more rectal complications identified in the intermediate strength cohort of patients in this analysis, there were no other significantly worse clinical or biochemical outcomes for patients implanted with intermediate strength sources.

 

PubMed

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ClarityDX Prostate clinical study expanding to the United States

Oct 8, 2019: APCaRI and Nanostics Inc. are excited to announce the opening of the first recruitment site in the US for the ClarityDX Prostate clinical validation study with Century Clinical Research Inc., based in Daytona Beach, Florida. ClarityDX Prostate is a novel liquid biopsy test for the early diagnosis of clinically significant prostate cancer.

The clinical validation study targets the recruitment of 2,800 patients with elevated levels of PSA. Therefore, US recruitment will significantly accelerate the clinical study timeline and increase patient cohort diversity.

Funding support to include US patients comes from the Bird Dogs for Prostate Cancer Research, Alberta Cancer Foundation, Alberta Innovates-ASBIRI program and the University of Alberta. The US and Canadian study samples will continue to be processed in partnership with DynaLIFE Medical Labs in Edmonton, Alberta.

“We’re very happy to partner with Century Clinical Research to recruit US men to our study,” John Lewis, CEO of Nanostics said, “the Florida recruitment site will help us increase the regional diversity of our cohort and strengthen the results of our ClarityDX Prostate study, ultimately, allowing us to make the test available to men across North America.”

“Our extensive clinical trial research experience and diverse patient population in Daytona Beach makes us a perfect partner…” said Thomas Gaskin, Vice-President & CFO of Century Clinical Research, Inc., “we look forward to working with Nanostics to develop their ClarityDX Prostate test to help improve prostate cancer outcomes.”

Implementing ClarityDX Prostate may eliminate up to 600,000 unnecessary biopsies, 24,000 hospitalizations and up to 50% of unnecessary treatments for prostate cancer in North America. This equates to a projected $1.4B per year in cost savings to healthcare and a dramatic impact on the healthcare experience and quality of life for men.

About Century Clinical Research, Inc.
Century Clinical Research, Inc. has over ten years of clinical research experience in multiple specialties, including hematology and oncology. Our staff has completed numerous industry-sponsored clinical trials in phases II-IV and has an excellent track record in quality completion of critical trials. Century Clinical Research, Inc. offers a full research infrastructure and our research staff has been trained in electronic data capture with multiple sponsors. We use a computerized clinical research program for tracking study participation and regulatory documents.
Website: https://www.centuryclinical.com/century_clinical_research.html

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