IL1B and chronic myelogenous leukemia, BCR-ABL1 positive: IL-1RAP, as an interleukin 1 receptor-1 (IL1R1) coreceptor, leads to increased proliferation of CML LSCs by binding of IL-1A or IL-1B and activation of the NF-κB, JNK, and P38-MAPK signaling pathways [33].