12 research outputs found
Correction: “The 5th edition of The World Health Organization Classification of Haematolymphoid Tumours: Lymphoid Neoplasms” Leukemia. 2022 Jul;36(7):1720–1748
Development of an allele-specific minimal residual disease assay for patients with juvenile myelomonocytic leukemia
Juvenile myelomonocytic leukemia is an
aggressive and frequently lethal myeloproliferative disorder of childhood. Somatic mutations in NRAS, KRAS, or
PTPN11 occur in 60% of cases. Monitoring disease status is difficult because of
the lack of characteristic leukemic blasts
at diagnosis. We designed a fluorescently
based, allele-specific polymerase chain
reaction assay called TaqMAMA to detect
the most common RAS or PTPN11 mutations. We analyzed peripheral blood
and/or bone marrow of 25 patients for
levels of mutant alleles over time. Analysis of pre–hematopoietic stem-cell transplantation, samples revealed a broad distribution of the quantity of the mutant
alleles. After hematopoietic stem-cell
transplantation, the level of the mutant
allele rose rapidly in patients who relapsed and correlated well with falling
donor chimerism. Simultaneously analyzed peripheral blood and bone marrow
samples demonstrate that blood can be
monitored for residual disease. Importantly, these assays provide a sensitive
strategy to evaluate molecular responses
to new therapeutic strategies
New neutron long-counter for delayed neutron investigations with the LOHENGRIN fission fragment separator
Some neutrons are emitted from fission products seconds to minutes after fission occurs. The knowledge of these delayed neutrons is essential in the field of nuclear energy. But the probabilities to emit such delayed neutrons (Pn) are not always well known. A summary of different databases and compilations of Pn values is presented to show these discrepancies and uncertainties. The usual methods used to determine these nuclear data are then reviewed with an emphasis on biases and systematic errors to be avoided. To measure precise Pn values, a new neutron LOng-counter with ENergy Independant Efficiency (LOENIE) has been built for the LOHENGRIN separator facility installed at Institut Laue Langevin (FRANCE). Its characteristics and first results obtained are presented
Results of allogeneic stem cell transplantation in patients affected by Shwachman-Diamond syndrome. A retrospective study of SAA-EBMT
Immunobiology of allogeneic stem cell transplantation and immunotherapy of hematological disease
The origin and abundances of the chemical elements revisited
The basic scheme of nucleosynthesis (building of heavy elements from light ones) has held up very well since it was first proposed more than 30 years ago by E.M. Burbidge, G.R. Burbidge, A.G.W. Cameron, W.A. Fowler, and F. Hoyle. Significant advances in the intervening years include (a) observations of elemental and a few isotopic ratios in many more extrasolar-system sites, including metal-poor dwarf irregular galaxies, where very little has happened, and supernovae and their remnants, where a great deal has happened, (b) recognition of the early universe as good for making all the elements up to helium, (c) resolution of heavy element burning in stars into separate carbon, neon, oxygen, and silicon burning, with fine tuning of the resulting abundances by explosive nucleosynthesis in outgoing supernova shock waves, (d) clarification of the role of Type I supernovae, (e) concordance between elements produced in short-lived and long-lived stars with those that increased quickly and slowly over the history of the galaxy, and (f) calibration of calculations of the evolution and explosion of massive stars against the detailed observations of SN 1987A. The discussion presupposes a reader (a) with some prior knowledge of astronomy at the level of recognizing what is meant by an A star and an AGB star and (b) with at least a mild interest in how we got to where we currently are. © 1991 Springer-Verlag