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Cancer Researchers Link DICER1 Gene Mutation to Rare Childhood Cancer
Date:6/25/2009

organ development would be significant."

Hill says not everyone who inherits a mutation develops PPB and children with PPB are typically normal in every other way. The team theorizes that something else must happen to the normal copy of DICER1 in lung cells for a tumor to develop. When the research team looked at PPB tumors to see if there is any DICER1 protein being made from the remaining normal copy of the gene, they were surprised by the results: "We expected to see that the tumor cells had no DICER1 protein giving us a nice explanation for why the tumor cells had gone haywire." But that wasn't the case. They found that the benign cells that grew on the surface of the tumor had lost the DICER1 protein. "During lung development the cells that line the airways and the cells that make up the support structures have to communicate." Hill explained. "Loss of DICER1 in the airway lining cells could disrupt this communication, possibly setting the stage for abnormal growth."

Studying tumor cells for genetic mutations has led to many advances in the understanding of cancer. This discovery may represent a first step in understanding a new mechanism for how cancer begins. Conceivably, the mutated cells do not turn into tumors themselves. Instead, these cells influence surrounding cells to grow quickly, setting the stage for additional genetic mutations in cells that then become cancerous. Hill's team will now focus on demonstrating the sequence of events that result from loss of DICER1.

Only 50 or 60 cases of PPB are diagnosed worldwide each year. The cancer presents as cysts in early stages and progresses to solid lung tumors over time. If detected in the earliest stages, 90 percent of patients appear to be cured when treated with a surgical intervention and sometimes chemotherapy.

The research was conducted at Children's National Medical Center, the International Pleuropulmonary Blastoma Regist
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