In eosinophilic disorders, for M/LN-eo linked to ETV6::ABL1, although available data are limited, mutations in genes such as ARID2, TP53, SETD2, CDKN1B, PTPN11, and SMC1A have been observed in roughly 50% of cases [10]. Here, CDKN1B is linked to eosinophil disorder.