Myeloid and Lymphoid Neoplasms with eosinophilia and Tyrosine Kinase gene fusions (MLN‐TK) is a World Health Organisation (WHO) and International Consensus Classification (ICC) disease category of rare haematological malignancies characterised by genomic rearrangements in genes encoding specific tyrosine kinases (TK). The gene discussed is TKT; the disease is Increased total eosinophil count.