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Retinoblastoma researchers find success with two-drug combination

Investigators at St. Jude Children's Research Hospital have demonstrated in laboratory studies a new treatment for the pediatric eye cancer retinoblastoma that appears to be more effective than the current standard therapy, and more likely to prevent the recurrence of this cancer. A report on their work appears in the October 15 issue of Clinical Cancer Research.

Retinoblastoma is a tumor that arises in the cells of the retina, the light-sensitive tissue at the back of the eyeball, following mutation of the gene RB1. It is the third most common form of cancer in infants. Left untreated, the cancer spreads and is fatal. Retinoblastoma strikes about 250-350 infants and young children each year in the United States.

The St. Jude study suggests a new approach to treatment that could save both lives and vision, according to Michael A. Dyer, PhD, an assistant member of the department of Developmental Neurobiology. The new treatment might also prevent recurrence of retinoblastoma in children whose cancer is very advanced, he noted. Dyer is the senior author of the Clinical Cancer Care report.

The study showed that combination therapy with topotecan and carboplatin is superior to the standard triple-drug therapy using vincristine, carboplatin and etoposide. The new combination eliminates the use of etoposide, which is known to increase the risk of the children getting a form of leukemia called acute myeloblastic leukemia. The findings also suggest that vincristine, which is used in the standard combination therapy, contributes little to the treatment of retinoblastoma, and therefore can be eliminated from therapy.

Dyer's group was prompted to look for new treatments because of the difficulty in managing this cancer. Patients with retinoblastoma usually undergo enucleation (removal of the diseased eye); and children with retinoblastoma in both eyes often must undergo anticancer therapy in order to avoid the loss of both eyes and blindness.

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Contact: Kelly Perry
kelly.perry@stjude.org
901-495-3306
St. Jude Children's Research Hospital
17-Oct-2005


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