Imatinib-induced hard palate mucosal discoloration in patients with gastrointestinal stromal tumour (GIST) and dermatofibrosarcoma protuberans (DFSP): a case series of three patients and literature review - Stawarz, Katarzyna; Zwolinski, Jakub; Galazka, Adam; Gorzelnik, Anna; Bienkowska-Pluta, Karolina; Durzynska, Monika (Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii, 2024)