Haematological features of telomere biology disorders diagnosed in adulthood: A French nationwide study of 127 patients

Summary Data on haematological features of telomere biology disorders (TBD) remain scarce. We describe haematological, extra‐haematological characteristics and prognosis of 127 genetically confirmed TBD patients diagnosed after the age of 15. Ninety‐three index cases and 34 affected relatives were included. At diagnosis of TBD, 76.3% of index cases had haematological features, half pulmonary features and a third liver features. At diagnosis, bone marrow failure (BMF) was present in 59 (46.5%), myelodysplastic syndrome (MDS) in 22 (17.3%) and acute myeloid leukaemia (AML) in 2 (1.6%) while 13 (10.2%) developed or worsened bone marrow involvement during follow‐up. At diagnosis, compared to MDS/AML patients, BMF patients were younger (median 23.1 years vs. 43.8, p = 0.007), and had a better outcome (4‐year overall survival 76.3% vs. 31.8%, p