A recent Children's Oncology Group (COG) study identified a treatment algorithm that can help reduce therapy for some neuroblastoma patients with intermediate-risk disease, while maintaining good clinical outcomes. The study's findings are particularly significant because they suggest that many infants and young children with this disease may be spared unpleasant or lingering side effects of prolonged therapy, says lead researcher Clare Twist, MD, of Roswell Park Comprehensive Cancer Center.
The results of the study, which follows in the footsteps of previous risk-based clinical trials that led to substantial improvement for children with neuroblastoma, were published in the Journal of Clinical Oncology.
Neuroblastoma is the most common extra-cranial malignant solid tumor of childhood. It primarily affects infants and children up to age 5 but can occur in older children and young adults. The disease is classified as high-risk or non-high-risk based on the patient's age at diagnosis, the extent of the disease and particular genetic features of the tumor cells. Treatment of high-risk neuroblastoma involves very intensive therapy, but for patients with non-high-risk neuroblastoma, recent clinical trials have shown that therapy can often be reduced due to the generally excellent prognoses for these patients.
The prospective phase III study (ClinicalTrials.gov identifier NCT00499616) enrolled 404 children in three groups across North America with intermediate-risk neuroblastoma. The researchers developed and then tested an algorithm based on tumor biology and anticipated response to treatment, and designed to reduce therapy for patients without compromising overall survival rates. They focused on patients whose disease was determined to have favorable clinical and biologic features.
In order to identify subgroups of patients for whom reduction of therapy was felt to be safe, we tested patients' tumors for specific genetic alterations sometimes present in neuroblastoma cells that predict which tumors are at increased risk to recur. We found that we could reduce therapy both through decreasing the total number of chemotherapy cycles administered or decreasing the extent of surgery needed, in some cases eliminating the need for surgical removal of the primary tumor."
Dr. Clare Twist, Professor of Oncology and Director of Pediatric Experimental Therapeutics in the Department of Pediatric Oncology at Roswell Park and first author on the new study
The study results showed a three-year overall survival (OS) rate of 94.9% among all patients. Among patients under age 1, those with favorable-biology stage 4 disease had a significantly superior event-free survival compared to infants with unfavorable stage 4 disease (87% versus 67%), but OS was not significantly different between these two groups (95% vs. 86.7%). Patients with localized disease had an OS rate of 100%.
Dr. Twist notes that continued research is needed to identify more effective treatment strategies for infants who have stage 4 neuroblastoma with unfavorable biology.
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