Ewing Sarcoma in Infants and Children Under 2 Years of Age: A French Retrospective Study.
This French retrospective analysis found that 17 infants with Ewing sarcoma treated using age- and weight-adapted chemotherapy and less frequent radiotherapy had 88% 5-year disease-free and overall survival, with late effects reported mainly after local treatment.
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This French retrospective analysis found that 17 infants with Ewing sarcoma treated using age- and weight-adapted chemotherapy and less frequent radiotherapy had 88% 5-year disease-free and overall survival, with late effects reported mainly after local treatment.
Research significance
The record provides retrospective evidence that adapted chemotherapy dosing combined with adequate local tumor control can be associated with favorable survival in infants; it supports, but does not establish, the hypothesis that treatment adaptation may preserve efficacy while limiting toxicity in this rare age group.
Source abstract
Ewing sarcoma, the second most common primary bone cancer in children, requires intensive treatment that may lead to significant long-term sequelae, particularly in infants. We retrospectively analyzed data from 1621 French patients treated between 1988 and 2015 within the EW88/93/97 or EE99 trials, focusing on 17 infants diagnosed before 24 months of age (1% of the cohort). Their outcomes were compared to the 1245 older pediatric patients (aged 2-18 years). Infant Ewing sarcomas were more frequently extraosseous (29% vs. 8%, p = 0.0037). Acute chemotherapy tolerance was comparable between infants and children under 2 years of age and older children. With a median follow-up of 13.2 years (range: 7.8-15), adapted chemotherapy doses and reduced use of radiotherapy for local treatment, outcomes in infants were favorable, with the same rate of 88% for 5-year disease-free survival (DFS) and overall survival (OS). Two infants experienced localized recurrences, one of whom had undergone incomplete tumor resection without additional local treatment. At the last follow-up, long-term side effects were predominantly associated with local treatments, particularly surgery, rather than chemotherapy. However, given the young age of the patients, certain late toxicities (e.g., fertility impairment) remain unevaluated or could manifest in later years. Adapting chemotherapy doses to age and weight, combined with optimal local treatment, enables high survival rates in infants with Ewing sarcoma. Further monitoring is essential to assess long-term sequelae as this population ages.