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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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MLA Dr. Richard Starke Toured APCaRI Labs

The APCaRI laboratory in the Department of Oncology at the University of Alberta hosted an early morning visit on October 11 by Dr. Richard Starke, MLA for Vermilion-Lloydminster @RichardStarke. Dr. John Lewis led the tour of the facility and discussed the work being done by APCaRI members on using the in vivo chick embryo imaging technique to follow tumour motility through the vasculature, screening for metastasis-gene targets in human cancers to develop metastasis-blocking therapeutics, and the design of Nanostics’ prostate cancer diagnostic blood tests platform; ClarityDx Prostate. Later that day Richard Starke tweeted about his visit describing it as an incredible tour of @UAlberta research facilities!
Along with Dr.’s Starke and Lewis (from left to right in feature photo above) were technicians Mike Wong and Diana Pham, Nanostics COO Catalina Vasquez, technician Renjith Pillai and our Program manager Rume Djebah.

- Perrin Beatty