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Radiation therapy effective against Eye cancer

Kathryn Greven, Radiation oncologist and Craig Greven, Vitreoretinal surgeon, Wake Forest University have been treating patients with malignant melanoma of uvea with radiation therapy. Uveal malignant melanoma// is a rare tumor that occurs in only six per one million people per year in the United States. It is more common in lightly pigmented people and is rarely seen in nonwhite races. The results of the study were reported in American Society for Therapeutic Radiology and Oncology (ASTRO).

The researchers have done this procedure in 57 patients with uveal melanoma, which causes pigmentation in the eye, which results in eye loss. Earlier, the standard treatment for Uveal melanoma was removal of the eye. But, the Collaborative Ocular Melanoma Study (COMS), a multicenter national trial reported in 2001 that radiation was a safe and effective alternative to removing the eye.

The current study involved plaque radiotherapy, which is the most frequently used system for delivering radiation to the eye tumor. With this treatment, a small metal shield containing radioactive seeds is sutured to the outside of the eye over the tumor. The shield is left in place until the required dose of radiation has been delivered, usually for four to five days. Several different type of radiation can be used in the seeds; this study used iodine 125. The study found that at five years after radiation treatment, 90 percent of patients had their tumors controlled. Before treatment, patients’ median visual acuity was 20/30 (which means they could see from 20 feet away what someone with perfect vision can see from 30 feet away). After treatment, media visual acuity was 20/60. In almost half of patients (47 percent) vision was stable after treatment.

Researchers said, the study results are very encouraging and these findings in this small series of patients with melanoma treated by Iodine 125 radioactive plaque confirm data obtained in a much larger, earlier study (C OMS) that this procedure is effective in controlling the primary tumor, often with good visual outcomes.

Source: News wis
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