PDGFRA in paediatric high-grade glioma - target or distraction?

Paediatric high-grade gliomas (pHGGs) are aggressive and molecularly heterogenous paediatric brain tumours with extremely poor survival outcomes. Receptor tyrosine kinases (RTKs) are recurrently altered in a significant proportion of pHGGs and can be potentially targeted with tyrosine kinase inhibitors (TKIs). PDGFRA is the most frequently altered RTK in pHGG and as such, represents an attractive therapeutic target, yet patients harbouring PDGFRA aberrations have largely failed to respond to TKIs. This raises the question as to whether PDGFRA is the only oncogenic dependency in all cases of pHGG, or alternatively, if there are unrecognised mechanisms conferring TKI resistance. Here we explore the mechanisms by which specific PDGFRA alterations drive oncogenesis and potentially mediate therapeutic resistance, to ascertain whether PDGFRA is a clinically useful target or merely a distraction.