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Inherited Risk Factors Increase Odds of Developing Childhood Acute Lymphoblastic Leukemia
Date:8/16/2009

d additional cases for genetic analysis. COG is an international group of medical institutions that cooperate in research studies and clinical trials of childhood cancer treatment.

Researchers scanned the genomes of 441 children with ALL and a control group of 17,958 cancer-free individuals for more than 300,000 common genetic variations known as single nucleotide polymorphisms or SNPs.

The search found 18 SNPs that differed significantly in frequency between individuals with and without ALL. Six of the 18 SNPs were associated with one of the four main subtypes of ALL.

The six included two SNPs linked to the ARID5B gene. About 11 percent of those in the control group inherit the leukemia-risk ARID5B variations from both mother and father, Relling said. In comparison, the same high-risk ARID5B SNPs were found in 38 percent of patients with a type of ALL known as hyperdiploid ALL. That subtype accounts for about 20 percent of ALL patients.

Three more SNPs were traced to the genes IKZF1 and DDC, which are next to each other on chromosome 7. IKZF1 is also known as IKAROS. Earlier research from St. Jude and COG linked acquired changes in IKZF1 to an increased risk of ALL relapse. The new evidence tying inherited variation in IKZF1 to an increased risk of developing ALL underscores the need for medications targeting variations in this gene, Relling said.

Both ARID5B and IKZF1 play important roles in normal development of lymphoid or white blood cells, she said. ARID5B belongs to a family of genes that make transcription factors, which help regulate gene activity. "If they have an inherited variation that affects the function of those genes, these are plausible pathways for how a normal lymphoid cell could be disrupted and transformed into a cancer cell," Relling said.

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SOURCE St. Jude Children's Research Hospital
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