From KIT-mutated into wild-type: dedifferentiation of gastrointestinal stromal tumor in adolescent patient—a case report - Andrzejewska, Marta; Czarny, Jakub; Skalska-Sadowska, Jolanta; Jończyk-Potoczna, Katarzyna; Kurzawa, Paweł; Wichtowski, Mateusz; Wachowiak, Jacek; Derwich, Katarzyna (Journal of Gastrointestinal Oncology; Vol 14, No 4 (August 31, 2023): Journal of Gastrointestinal Oncology, 2023)