False-Negative Testing for FIP1L1::PDGFRA by Fluorescence in situ Hybridization Is a Frequent Cause of Diagnostic Delay. Pongdee T, Berry A, Wetzler L, et al. False-Negative Testing for FIP1L1::PDGFRA by Fluorescence in situ Hybridization Is a Frequent Cause of Diagnostic Delay. Acta haematologica. 2023:1-6. doi:10.1159/000528046 Read more