Myeloid/Lymphoid Neoplasms with eosinophilia and involvement of Tyrosine Kinase gene fusions (MLN‐TK) is a WHO disease category including a diverse group of malignancies characterised by recurrent genomic rearrangements of tyrosine kinase (TK) genes such as PDGFRA, PDGFRB, FGFR1, JAK2, ETV6 and FLT3. This evidence concerns the gene PDGFRB and Increased total eosinophil count.