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Study identifies targeted molecular therapy for untreatable NF1 tumors
Date:12/10/2012

CINCINNATI Researchers conducting a preclinical study in mice successfully used targeted molecular therapy to block mostly untreatable nerve tumors that develop in people with the genetic disorder Neurofibromatosis 1 (NF1).

Scientists from Cincinnati Children's Hospital Medical Center report their findings online Dec. 10 in the Journal of Clinical Investigation.

"We can for the first time shrink the large majority of neurofibromas, at least in mice, by using a molecularly targeted treatment," said Nancy Ratner, PhD, principal investigator and program leader for the Cancer Biology and Neural Tumors Program in the Cancer and Blood Disorders Institute at Cincinnati Children's. "At present there is no treatment for these tumors and our data provide strong rationale for testing this therapy in clinical trials for NF1."

Neurofibromas are benign tumors that grow along peripheral nerves in the body. They affect up to half of the people who have NF1. In the United States alone there are 10,000 people with NF1. Fueled initially by mutation of the tumor-suppressing gene NF1, the tumors can grow to become quite large and compress vital organs. They can also transform into deadly malignant peripheral nerve sheath tumors (MPNSTs), the leading cause of death in people with NF1.

The researchers tested an existing experimental drug from Pfizer called PD0325901, which in the current study shrank NF1 tumors in over 80 percent of the mice treated. Study authors report it was "the most dramatic result described to date for neurofibroma bearing mice."

The drug inhibits a protein called MEK, part of a molecular signaling chain that relays genetic instructions to the cell nucleus to promote cell growth. Researchers decided to test the drug after conducting a cross-species bioinformatics computer analysis of mouse and human NF1 tumors. The analysis identified genes and molecules that regulate cell signals driving the growth of neuro
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Contact: Nick Miller
nicholas.miller@cchmc.org
513-803-6035
Cincinnati Children's Hospital Medical Center
Source:Eurekalert

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