Nationwide questionnaire survey on pediatric pancreatic tumors in Japan.

Background: Pediatric pancreatic tumors are rare and account for < 0.1% of all childhood cancers. The primary treatment for pancreatic tumors is surgical resection. However, because of the lack of knowledge regarding pediatric pancreatic tumors, no comprehensive treatment plans for pediatric pancreatic tumors have been developed.

Aim: To compared the clinical features, treatment methods, and prognosis of pediatric pancreatic tumors in Japan with those in other countries.

Methods: Questionnaires were sent to 213 pediatric surgical units in Japan. Pancreatic tumors that were not surgically treated were excluded from the survey. The primary survey investigated the number of patients aged 0-18 years who underwent pancreatic tumor surgery and the type of tumors managed during the 22-year study period (from January 1, 2000 to December 31, 2021) by post card. The secondary survey assessed the clinical images, treatment methods, and tumor outcomes via email.

Results: The primary survey enrolled 228 patients. In the secondary survey, 213 patients were eventually enrolled. The most common type of pancreatic tumor was solid pseudopapillary neoplasm (SPN) [n = 164 (77.0%)], followed by pancreatoblastoma [n = 16 (7.5%)], pancreatic endocrine tumor [n = 14 (6.6%)], non-epithelial tumor [n = 9 (4.2%)], pancreatic tumor [n = 7 (3.3%)], and metastatic pancreatic tumor [n = 3 (1.4%)]. Overall, 123 (57.7%) patients underwent distal pancreatectomy, of whom 49 underwent laparoscopic surgery. Forty-four (20.7%) patients underwent enucleation, of whom eight underwent laparoscopic surgery. Thirty-two (15.0%) patients underwent pancreaticoduodenectomy, of whom one underwent laparoscopic surgery. All patients with SPN, including those with distant metastases and recurrent disease, survived.

Conclusion: SPN was more common in Japan than in other countries. Regardless of the histological type, resection is the most effective treatment for pediatric pancreatic tumors.