PDGFRA and gastrointestinal stromal tumor: Given the known heterogeneity within PDGFRA-mutant GIST, the differential immunological profile of PDGFRA D842V-mutant GIST in comparison with other PDGFRA mutants was subsequently investigated in order to better understand if the previously observed prominent immune features belong to all PDGFRA-mutant GIST or if they represent a specific peculiar fingerprint of the D842V mutant subgroup [36].