In a genomic study of patients with juvenile myelomonocytic leukemia (JMML), 16 patients had no RAS variants, and in three of these that were 56 months of age or older, the researchers identified ALK/ROS1 tyrosine kinase fusions (DCTN1-ALK, RANBP2-ALK, and TBL1XR1-ROS1). Here, RANBP2 is linked to juvenile myelomonocytic leukemia.