Premium
Ultrastructural and ultracytochemical differences between megakaryoblastic leukemia in children and adults analysis of 49 patients
Author(s) -
Eguchi Mitsuoki,
Ozawa Takebumi,
Sakakibara Hitoshi,
Sugifa Kenichi,
Iwama Yoshihiko,
Furukawa Toshiharu
Publication year - 1992
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/1097-0142(19920715)70:2<451::aid-cncr2820700213>3.0.co;2-v
Subject(s) - acute megakaryoblastic leukemia , down syndrome , medicine , chronic myelogenous leukemia , precursor cell , leukemia , ultrastructure , pathology , immunology , cell , biology , genetics , psychiatry
Background . Acute megakaryoblastic leukemia (AMKL) has two peaks in distribution of incidence (in adults and children 1 to 2 years of age) and is frequently seen in children with Down syndrome. The current study was undertaken to disclose whether there were any differences between these groups. Methods . Electron microscopic and ultrastructural cytochemical features of 49 children and adults with a AMKL or chronic myelogenous leukemia (CML) in megakaryoblastic crisis were compared. Results . Blast cells from children with AMKL, including those with and without Down syndrome, had immature features lacking typical alpha granules and a demarcation membrane system (DMS). However, blast cells from patients with AMKL with Down syndrome had more theta, electron‐lucent, and basophil‐like granules, suggesting that the blast cells had more potential to differentiate into other cell lines than megakaryocytes. The AMKL blast cells of adult patients showed a higher percentage of platelet peroxidase (PPO) positivity than other subgroups, and they occasionally contained typical alpha granules and DMS. This indicated that the blast cells of adults with AMKL were more mature than those of children and CML in megakaryoblastic crisis. Conclusions . By electron microscopic analysis, leu‐kemic megakaryoblasts differed between children with AMKL with and without Down syndrome, adults with AMKL, and patients with CML in megakaryoblastic crisis. Cancer 1992; 70:451–458.