TET2 and myeloid neoplasm: However, in the last month she stopped responding to therapy and her state of health started declining once again.<h4>Conclusion</h4>Atypical chronic myeloid leukemia (<i>BCR-ABL1 negative</i> with presence of TET2 gene mutation) is an unusual finding in myeloid neoplasms, have unknown prognosis and no current standard of treatment.