Phase I/II study of resection and intraoperative cesium-131 radioisotope brachytherapy in patients with newly diagnosed brain metastases

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Object

Resected brain metastases have a high rate of local recurrence without adjuvant therapy. Adjuvant whole-brain radiotherapy (WBRT) remains the standard of care with a local control rate > 90%. However, WBRT is delivered over 10–15 days, which can delay other therapy and is associated with acute and long-term toxicities. Permanent cesium-131 (131Cs) implants can be used at the time of metastatic resection, thereby avoiding the need for any additional therapy. The authors evaluated the safety, feasibility, and efficacy of a novel therapeutic approach with permanent 131Cs brachytherapy at the resection for brain metastases.

Methods

After institutional review board approval was obtained, 24 patients with a newly diagnosed metastasis to the brain were accrued to a prospective protocol between 2010 and 2012. There were 10 frontal, 7 parietal, 4 cerebellar, 2 occipital, and 1 temporal metastases. Histology included lung cancer (16), breast cancer (2), kidney cancer (2), melanoma (2), colon cancer (1), and cervical cancer (1). Stranded 131Cs seeds were placed as permanent volume implants. The prescription dose was 80 Gy at a 5-mm depth from the resection cavity surface. Distant metastases were treated with stereotactic radiosurgery (SRS) or WBRT, depending on the number of lesions. The primary end point was local (resection cavity) freedom from progression (FFP). Secondary end points included regional FFP, distant FFP, median survival, overall survival (OS), and toxicity.

Results

The median follow-up was 19.3 months (range 12.89–29.57 months). The median age was 65 years (range 45–84 years). The median size of resected tumor was 2.7 cm (range 1.5–5.5 cm), and the median volume of resected tumor was 10.31 cm3 (range 1.77–87.11 cm3). The median number of seeds used was 12 (range 4–35), with a median activity of 3.82 mCi per seed (range 3.31–4.83 mCi) and total activity of 46.91 mCi (range 15.31–130.70 mCi). Local FFP was 100%. There was 1 adjacent leptomeningeal recurrence, resulting in a 1-year regional FFP of 93.8% (95% CI 63.2%–99.1%). One-year distant FFP was 48.4% (95% CI 26.3%–67.4%). Median OS was 9.9 months (95% CI 4.8 months, upper limit not estimated) and 1-year OS was 50.0% (95% CI 29.1%–67.8%). Complications included CSF leak (1), seizure (1), and infection (1). There was no radiation necrosis.

Conclusions

The use of postresection permanent 131Cs brachytherapy implants resulted in no local recurrences and no radiation necrosis. This treatment was safe, well tolerated, and convenient for patients, resulting in a short radiation treatment course, high response rate, and minimal toxicity. These findings merit further study with a multicenter trial.

Abbreviations used in this paper:125I = iodine-125; 131Cs = cesium-131; FFP = freedom from progression; OS = overall survival; QOL = quality of life; RTOG = Radiation Therapy Oncology Group; SRS = stereotactic radiosurgery; WBRT = whole-brain radiotherapy.
Article Information

Contributor Notes

Address correspondence to: A. Gabriella Wernicke, M.D., M.Sc., Weill Medical College of Cornell University, Stich Radiation Oncology, 525 E. 68th St., New York, NY 10065. email: gaw9008@med.cornell.edu.Please include this information when citing this paper: published online May 2, 2014; DOI: 10.3171/2014.3.JNS131140.
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