A Molecular Study of Solid Pseudopapillary Neoplasm of the Pancreas in a Pediatric Patient

Abstract

Solid pseudopapillary neoplasm of the pancreas (SPNP) is considered as a tumor with low malignant potential. Little is known about how its molecular heterogeneity is involved in its pathogenesis. We aim to evaluate tumor heterogeneity by immunohistochemistry (IH) and proteomics in three macroscopically distinct areas. Tumor fragments were obtained from a 12-year-old female patient. We identified by mass spectrometry (MS) 1,427, 5,786, and 4,298 proteins for each sample, 1,337 being common to all fragments. Several MS results were immunohistochemically validated. Our results demonstrate unique intra-tumor protein profiles based on its heterogeneity.