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Studies assess genetics, modified treatment to improve outcomes, reduce toxicity
Date:12/8/2012

l influences such as access to care or oral medication compliance. Of the 492 patients, 138 (28%) had the SNP rs16754 (SNP+). After stratifying the patients by ethnicity, the investigators found that the presence of SNP rs16754 varied by race, with 53 percent of Asians, 34 percent of Hispanics, 25 percent of Caucasians, and 21 percent of African Americans carrying the genetic variation. The SNP+ patients had higher five-year overall survival rates than those without the variation (SNP-) (61% vs. 44%). Within each racial subgroup, the five-year overall survival rate was higher in the SNP+ patients.

Although survival improvements in leukemia clinical trials are often attributed to increased remission rates or decreased relapse, remission and relapse rates did not differ significantly between SNP+ and SNP- patients in this study. The investigators examined whether the SNP had any association with TRM and found that TRM rates did not differ by SNP rs16754 genotype when all ethnicities were considered together. However, TRM rates in SNP+ African-American and Asian patients, when taken together, were significantly lower than in SNP- patients of those two ethnicities. African-American and Asian patients without SNP rs16754 had significantly higher rates of treatment-related toxic death compared to SNP+ patients (African-American: 25% vs. 0%; Asian: 43% vs. 0%). These results suggest that the protective effect of the presence of SNP rs16754 in reducing chemotherapy-related toxicity in pediatric AML patients is more pronounced in those of African-American and Asian descent.

"Identifying the patient-specific factors that can affect responses to treatment in different patients with the same disease brings us closer to our goal of designing personalized treatments that provide the most therapeutic benefit with the least amount of toxicity to these children," said Phoenix Ho, MD, lead author and Attending Physician at Seattle Children's Hospital in the Divisi
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Contact: Andrea Slesinski
aslesinski@hematology.org
614-352-5096
American Society of Hematology
Source:Eurekalert

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