The radiation sensitivity of primary clonogenic blasts from 27 children with immunologically classified CD2-CD5-CD7-CD19+slg- B-lineage acute lymphoblastic leukemia (ALL) was analyzed using leukemic progenitor cell (LPC) colony assays. Radiation survival curves of primary clonogenic blasts (ie, LPC) were constructed for each patient using computer programs for the single-hit multitarget as well...

Some of the most potent inflammatory mediators share a lipid origin. They regulate a wide spectrum of cellular processes including cell proliferation and apoptosis. However, the precise roles and ways (if any) in which these compounds impact the growth and apoptosis of leukemic blasts remain incompletely resolved. In spite of this, significant advances have been recently made. Here we briefly r...

The efficacy of azacitidine has been demonstrated in acute myeloid leukemia (AML) patients with 20-30% bone marrow (BM) blasts, but limited data is available on patients with ≥30% blasts. We analyzed 55 newly diagnosed AML patients, treated with azacitidine. The overall response rate was 42%. Median overall survival (OS) was 12.3 months. We confirmed poor-risk cytogenetics, therapy-related AML,...

B lymphocytes can be induced to divide and form Ig-secreting clones either by Tcell help or by mitogens (1, 2). About one in three splenic lymphocytes respond to Bcell mitogens, and such activation is polyclonal: 1 clone in 1,000 produces antibodies against sheep erythrocytes (SRC), 1 1 in 500 against horse erythrocytes (HRC), and 1 in 50 against trinitrophenyl (TNP) (3-5). The presence of mito...

Cells of the myeloid lineage at various stages of maturity can differentiate into multinucleated osteoclasts. Yet, it is unclear which developmental stages of this lineage are more prone to become osteoclasts than others. We investigated the osteoclastogenic potential of three successive stages of myeloid development isolated from mouse bone marrow. Early blasts (CD31hi/Ly-6C-), myeloid blasts ...

The blast cells of acute myeloblastic leukemia (AML) may be considered as a renewal population, maintained by blast stem cells capable of both self-renewal and the generation of progeny with reduced or absent proliferative potential. Blast progenitor renewal is manifested in suspension culture by an exponential increase in clonogenic cells. This growth requires that two conditions be met: first...

Classification The FAB and WHO classifications The French-American-British (FAB) cooperative group produced the first systematic attempt of a classification dividing myelodysplastic syndrome (MDS) into five subgroups: refractory anemia (RA), RA with ringed sideroblasts (RARS), RA with excess of blasts (RAEB), RAEB in transformation (RAEB-t), and chronic myelomonocytic leukemia (CMML)1;2. Distin...

The clinical presentation of acute leukemia results from infiltration of bone marrow or extramedullary sites by blasts. As a result, initial symptoms may be due to the presence of anemia, neutropenia, or thrombocytopenia. Patients generally present with nonspecific complaints including weakness, lethargy, fatigue, dyspnea, fever, weight loss, or bleed‐ ing. Blasts may also infiltrate organs or ...