_:vb50939557 . _:vb50939557 "url:https://www.cancer.gov/publications/dictionaries/cancer-terms/def/792759"^^ . _:vb50939557 . _:vb50939557 . _:vb50939557 "A myeloproliferative neoplasm characterized by leukocytosis in newborns with Down syndrome."^^ . _:vb50939557 "url:https://www.ncbi.nlm.nih.gov/pubmed/6229618"^^ . _:vb50939557 . _:vb50939557 .