Abstract:
PURPOSE:To report intraoperative ultrasonography-guided positioning of iodine 125 (I(125)) plaques for brachytherapy of choroidal melanoma as a quality improvement measure. DESIGN:Retrospective, single-center, consecutive case-cohort study. PARTICIPANTS:One hundred fifty consecutive patients with choroidal melanoma. METHODS:Patients with choroidal melanoma who were treated with I(125) plaque brachytherapy from January 2007 through January 2011 with at least 6 months of clinical follow-up were included. MAIN OUTCOME MEASURES:Patient and tumor characteristics at diagnosis were tabulated. The need for plaque repositioning if intraoperative ultrasonography showed the plaque to be either not centered on the tumor or if there was less than 1.0 mm of plaque margin beyond the tumor border was recorded. The rate of local treatment failure and occurrence of distant metastasis were determined. RESULTS:The average interval from surgery to last follow-up was 21.5 months. Fifty-four (36%) of 150 patients required plaque repositioning. Of tumors located in the macula, equator, and periphery, 15 (36.6%), 26 (36.6%), and 13 (34.2%) required repositioning. There was no case of local treatment failure during a mean follow-up of 21.5 months (range, 6-48 months). Clinical evidence of choroidal melanoma metastasis developed in 9 patients. The cumulative 2-year Kaplan-Meier rate of local treatment failure in the cohort was statistically lower compared with the Collaborative Ocular Melanoma Study, which did not require ultrasonography-guided plaque positioning. CONCLUSIONS:Intraoperative ultrasonography identified the need to reposition I(125) plaques to achieve centration and plaque margin (>1.0 mm) beyond the tumor border in 36% of eyes. Neither tumor size nor tumor location correlated with the need to reposition the plaque. There was no case of local treatment failure during follow-up in this series. Correct plaque position is an essential component of quality outcomes in brachytherapy. Intraoperative ultrasonography reduces geographic errors in placement in eye plaque therapy and may help to reduce local treatment failure in choroidal melanoma.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Chang MY,Kamrava M,Demanes DJ,Leu M,Agazaryan N,Lamb J,Moral JN,Almanzor R,McCannel TAdoi
10.1016/j.ophtha.2011.11.011subject
Has Abstractpub_date
2012-05-01 00:00:00pages
1073-7issue
5eissn
0161-6420issn
1549-4713pii
S0161-6420(11)01079-7journal_volume
119pub_type
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