PDGFRA and glioblastoma: PDGFR-α amplification has already been investigated in some tumour types, such as oesophageal squamous cell carcinoma [25], pulmonary artery intimal sarcomas (where it was demonstrated that PDGFR-α amplification is strongly associated with the development of this type of neoplasia) [26] and glioblastoma, occurring in 8 to 16% of cases [14].