Roberta Zuntini, Chiara Cattani, Lucia Pedace, Evelina Miele, Stefano Giuseppe Caraffi, Stefano Gardini, Elena Ficarelli, Simone Pizzi, Francesca Clementina Radio, Angelica Barone, Simonetta Piana, Patrizia Bertolini, Domenico Corradi, Maria Marinelli, Caterina Longo, Alberico Motolese, Orsetta Zuffardi, Marco Tartaglia, Livia Garavelli
We report a 7-year-old boy born with epidermal nevi (EN) arranged according to Blaschko's lines involving the face and head, right upper limb, chest, and left lower limb, who developed a left paratesticular embryonal rhabdomyosarcoma at 18 months of age. Parallel sequencing identified a gain-of-function variant (c.37G>C, p.Gly13Arg) of HRAS in both epidermal nevus and tumor but not in leukocytes or buccal mucosal epithelial cells, indicating its postzygotic origin. The variant accounted for 33% and 92% of the total reads in the nevus and tumor DNA specimens, respectively, supporting additional somatic hits in the latter...
2023: Frontiers in Genetics