FIP1L1::PDGFRA del(4q12) Quantitative RQ-PCR detection of the FIP1L1::PDGFRA fusion from interstitial 4q12 deletion in HES and chronic eosinophilic leukemia. FIP1L1::PDGFRA del(4q12)Eric Johnson2026-05-03T16:03:03-07:00