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Genetic information may help predict likelihood of survival following chemotherapy for breast cancer
Date:5/10/2011

patients with predicted endocrine sensitivity. In 28 percent of patients predicted to be treatment sensitive, the 3-year distant relapse-free survival (DRFS) was 92 percent, and there was an absolute risk reduction (ARR) of 18 percent. Patients predicted to be treatment sensitive had a 5-fold reduction in the risk of distant relapse. "Overall, there was a significant association between predicted sensitivity to treatment and improved DRFS," the authors write.

Treatment sensitivity was predicted in 37 of 123 patients (30 percent) in the ER-positive phenotypic subgroup and in 19 of 74 (26 percent) in the ER-negative subgroup. In the ER-positive subgroup, these patients had a DRFS of 97 percent and a significant ARR of 11 percent at 3 years of follow-up. Patients with ER-negative cancer predicted to be treatment sensitive had significantly improved 3-year DRFS of 83 percent, an ARR of 26 percent and a positive predictive value for pathologic response of 83 percent.

The researchers note that other genomic predictors showed paradoxically worse survival for patients predicted to be responsive to chemotherapy.

"Any test based on predicted sensitivity, resistance, or both to guide the selection of a standard adjuvant treatment regimen should predict a high probability of survival for patients predicted to be treatment sensitive (negative predictive value, no relapse if predicted to be treatment sensitive) and a clinically meaningful survival difference between patients predicted to be treatment sensitive and insensitive (ARR) as well as improve on predictions using existing clinical-pathological information. The performance of our predictive test meets these criteria in an independent validation cohort," the authors write.

The researchers add that a predictive test with this performance could potentially assist medical decision-making as it could identify patients with stage II-III, ER-positive and ERBB2-negative breast cancer with exce
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Contact: Laura Sussman
lsussman@mdanderson.org
713-745-2457
JAMA and Archives Journals
Source:Eurekalert

Page: 1 2 3

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