In this week’s episode, we look at the role of a previously unidentified variant of DNA methyltransferase 1 as a determinant of beta-thalessemia phenotype, report on the association of vascular thromboembolism in cancer patients treated with immune checkpoint inhibitors, and finally we explore preclinical models of acute erythroid leukemia using CRISPR/Cas 9 hematopoietic genome editing.