Characteristics and survival outcomes in pediatric patients with spinal chordomas: insights from the National Cancer Database and review of the literature.

Purpose: Spinal chordomas are aggressive tumors that rarely occur in the pediatric population. Demographics and post-treatment outcomes in this select group of patients is poorly studied. We hence aimed to analyze the clinical characteristics, demographics, and survival outcomes of pediatric patients with spinal chordomas, in contrast to the adult population. To address this, the literature was reviewed to evaluate the coverage on spinal chordomas of the pediatric population, and the National Cancer Database (NCDB) was analyzed to provide insights into the US experience over the past two decades.

Methods: A search of the literature was performed leveraging the MEDLINE and Web of Science electronic databases from inception until March 2024, using the keywords "spinal," "chordoma," and "pediatric". Additionally, the NCDB was queried for pediatric patients (≤ 21 years) with chordoma treated between 2004 and 2017. Baseline characteristics, tumor specifics, treatment details, and survival outcomes were collected and analyzed.

Results: From the literature, 45 pediatric chordoma patients were identified, with a median age of 7 years. Most chordomas were in the cervical spine (40%), and 93% of the patients received surgical treatment. Gross total resection was achieved in 59% of cases, and 49% received adjuvant radiotherapy. Recurrence, metastasis, and mortality rates were 7%, 18%, and 24%, respectively at a median follow-up of 12 months. In the NCDB cohort, 53 pediatric patients (≤ 21 years) and 980 adults (> 21 years) were compared. Despite having smaller tumors in size, pediatric patients presented with more advanced tumors with a higher proportion of stage 4 tumors. They had more mobile spine chordomas (83% vs. 51%) and traveled further for treatment (57 vs. 27 miles). Pediatric patients also received higher radiation doses (5420 vs. 5049 cGy). Surgical resection and adjuvant radiotherapy were common treatments in both groups. After matching, outcomes, including survival rates and early mortality, were similar between age groups. Kaplan-Meier analysis showed no difference in overall survival probabilities between the age groups both prior to and after matching.

Conclusion: While pediatric patients with spinal chordomas present with more advanced stage tumors, they demonstrate similar overall survival outcomes when compared to adults. The current literature is mainly composed of single cases and other reports of low evidence levels.