Wiskott-Aldrich syndrome presenting with a clinical picture mimicking juvenile myelomonocytic leukaemia

Ayami Yoshimi, Yoshiro Kamachi, Kosuke Imai, Nobuhiro Watanabe, Hisaya Nakadate, Takashi Kanazawa, Shuichi Ozono, Ryoji Kobayashi, Misa Yoshida, Chie Kobayashi, Asahito Hama, Hideki Muramatsu, Yoji Sasahara, Marcus Jakob, Tomohiro Morio, Stephan Ehl, Atsushi Manabe, Charlotte Niemeyer, Seiji Kojima

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Background: Wiskott-Aldrich syndrome (WAS) is a rare X-linked immunodeficiency caused by defects of the WAS protein (WASP) gene. Patients with WAS typically demonstrate micro-thrombocytopenia. Procedures: The report describes seven male infants with WAS that initially presented with leukocytosis, monocytosis, and myeloid and erythroid precursors in the peripheral blood (PB) and dysplasia in the bone marrow (BM), which was initially indistinguishable from juvenile myelomonocytic leukaemia (JMML). Results: The median age of affected patients was 1 month (range, 1-4 months). Splenomegaly was absent in four of these patients, which was unusual for JMML. A mutation analysis of genes in the RAS-signalling pathway did not support a diagnosis of JMML. Non-haematological features, such as eczema (n=7) and bloody stools (n=6), ultimately led to the diagnosis of WAS at a median age of 4 months (range, 3-8 months), which was confirmed by absent (n=6) or reduced (n=1) WASP expression in lymphocytes by flow cytometry (FCM) and a WASP gene mutation. Interestingly, mean platelet volume (MPV) was normal in three of five patients and six of seven patients demonstrated occasional giant platelets, which was not compatible with WAS. Conclusions: These data suggest that WAS should be considered in male infants presenting with JMML-like features if no molecular markers of JMML can be detected.

Original languageEnglish
Pages (from-to)836-841
Number of pages6
JournalPediatric Blood and Cancer
Issue number5
Publication statusPublished - 2013 May


  • Children
  • Juvenile myelomonocytic leukaemia
  • Wiskott-Aldrich syndrome

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Hematology
  • Oncology


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