PTPN11 and acute lymphoblastic leukemia: In partnership with Charlotte Niemeyer, PhD, Drs. Tartaglia and Gelb showed that somatic changes in PTPN11 are causal to the majority of cases of juvenile myelomonocytic leukemia (JMML) and are also found in a minority of cases of B‐cell lineage acute lymphocytic leukemia (ALL), acute myeloid leukemia (AML), and myelodysplastic syndrome (Tartaglia, 2004; Tartaglia et al., 2003).