PDGFRA and gastrointestinal stromal tumor: Actually, our study goes further into PDGFRA mutant GIST by exploring the differences between the D842V and non-D842V gene expression profiles and surprisingly shows that GIST with the D842V mutation is the subgroup driving the discoveries previously made, probably because they are, as matter of fact, the most frequent mutation in PDGFRA mutant GIST.