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Bastida P.,Hospital Universitario Materno Infantil Vall dHebron | Garcia-Minaur S.,Hospital Universitario Materno Infantil Vall dHebron | Ezquieta B.,Laboratory of Molecular Diagnosis | Dapena J.L.,Hospital Universitario Materno Infantil Vall dHebron | Sanchez De Toledo J.,Hospital Universitario Materno Infantil Vall dHebron
Journal of Pediatric Hematology/Oncology | Year: 2011

Children with Noonan syndrome (NS) are at increased risk of developing juvenile myelomonocytic leukemia (JMML) or a myeloproliferative disorder associated with NS (MPD/NS) resembling JMML in the first weeks of life; whereas JMML is an aggressive disorder requiring hematopoietic stem cell transplantation, MPD/NS may resolve without treatment and cases with spontaneous remission have also been reported. Two cases of NS with hematologic disorders are described. Diagnosis of the syndrome was confirmed by the identification of earlier reported germline missense mutations in the PTPN11 gene. Splenomegaly in 1 patient and leukocytosis, monocytosis and "in vitro" culture assays consistent with JMML in both were the most salient hematologic features. After a 24-month follow-up, these 2 infants continue to improve and JMML has been ruled out. Splenomegaly persists in 1 patient and monocytosis in both, but without signs of malignancy, thereby suggesting abnormal hematopoiesis or MPD/NS, as described in NS. Copyright © 2011 by Lippincott Williams & Wilkins.

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