Procedimiento para producir plaquetas humanas a partir de células en cultivo.

Se describe un procedimiento para obtener cantidades ilimitadas de plaquetas humanas a partir de las líneas celulares K562 y KU812, derivadas de leucemias mieloides. El procedimiento se basa en el tratamiento con estaurosporina a concentraciones 50 a 100 nM durante 3 a 6 días. Las células pueden crecerse en suspensión y las plaquetas pueden ser separadas de las células por métodos estándar. Las plaquetas son reconocibles morfológicamente y comparten características bioquímicas y ultraestructurales con las plaquetas aisladas de sangre. Se puede obtener así una preparación de plaquetas humanas a partir de precursores celulares genéticamente idénticos y libre de otros productos biológicos de origen humano. Pueden ser usadas para fines analíticos como servir de estándar en ensayos plaquetarios biológicos o bioquímicos.Solicitud: 009900666 (05.04.1999)Nº Pub. de Solicitud: ES2155379A1 (01.05.2001)Nº de Patente: ES2155379B1 (01.12.2001

Allogeneic stem cell transplantation using HLA-matched donors for acute myeloid leukemia with deletion 5q or monosomy 5 : a study from the Acute Leukemia Working Party of the EBMT

Deletion 5q or monosomy 5 (-5/5q-) in acute myeloid leukemia (AML) is a common high-risk feature that is referred to allogeneic stem cell transplantation. However, -5/5q- is frequently associated with other high-risk cytogenetic aberrations such as complex karyotype, monosomal karyotype, monosomy 7 (-7), or 17p abnormalities (abn (17p)), the significance of which is unknown. In order to address this question, we studied adult patients with AML harboring -5/5q- having their first allogeneic transplantation between 2000 and 2015. Five hundred and one patients with -5/5q- have been analyzed. Three hundred and thirty-eight patients (67%) were in first remission and 142 (28%) had an active disease at time of allogeneic transplantation. The 2-year probabilities of overall survival and leukemia-free survival were 27% and 20%, respectively. The 2-year probability of treatment-related mortality was 20%. We identified four different cytogenetic groups according to additional abnormalities with prognostic impact: -5/5q- without complex karyotype, monosomal karyotype or abn(17p), -5/5q- within a complex karyotype, -5/5q- within a monosomal karyotype and the combination of -5/5q- with abn(17p). In multivariate analysis, factors associated with worse overall survival and leukemia-free survival across the four groups were active disease, age, monosomal karyotype, and abn(17p). The presence of -5/5q- without monosomal karyotype or abn(17p) was associated with a significantly better survival rate while -5/5q- in conjunction with monosomal karyotype or abn(17p) translated into a worse outcome. The patients harboring the combination of -5/5q- with abn(17p) showed very limited benefit from allogeneic transplantation.Peer reviewe

Procedimiento para determinar la eficacia del tratamiento y el grado de progresión de la leucemia mieloide crónica mediante el uso de SPI-1/PU.1.

Procedimiento para determinar la eficacia del tratamiento y el grado de progresión de la leucemia mieloide crónica mediante el uso de SPI-1/PU.1 que consiste en la determinación de mRNA o de proteína del gen SPI-1/PU.1, en muestras de células de sangre o médula ósea de pacientes de LMC y su comparación con muestras de sujetos sanos o del mismo paciente tras el tratamiento antileucémico. Niveles de mRNA o proteína de SPI-1/PU.1 altos o comparables a los de sujetos sanos son indicadores de respuesta al tratamiento. La presencia de SPI-1/PU.1 es indicador de respuesta al tratamiento y recuperación de hematopoyesis normal. Por el contrario, una expresión reducida es indicador de persistencia de la leucemia y mal pronóstico.Solicitud: 200402864 (22.11.2004)Nº Pub. de Solicitud: ES2315040A1 (16.03.2009)Nº de Patente: ES2315040B2 (16.10.2009

Validation of the revised IPSS at transplant in patients with myelodysplastic syndrome/transformed acute myelogenous leukemia receiving allogeneic stem cell transplantation

The International Prognostic Scoring System has been revised (IPSS-R) to predict prognosis of patients with myelodysplastic syndromes at diagnosis. To validate the use of the IPSS-R assesse

Validation of the revised IPSS at transplant in patients with myelodysplastic syndrome/transformed acute myelogenous leukemia receiving allogeneic stem cell transplantation : a retrospective analysis of the EBMT chronic malignancies working party

The International Prognostic Scoring System has been revised (IPSS-R) to predict prognosis of patients with myelodysplastic syndromes at diagnosis. To validate the use of the IPSS-R assessed before transplant rather than at diagnosis we performed a retrospective analysis of the EBMT database. A total of 579 patients had sufficient information available to calculate IPSS-R at transplant. Median overall survival (OS) from transplant was significantly different according to IPSS-R: very low 23.6 months, low 55.0 months, intermediate 19.7 months, high 13.5 months, very high 7.8 months (P <0.001). In a multivariate Cox model the following parameters were significant risk factors for OS: IPSS-R, graft source, age and prior treatment. Median relapse free survival also showed significant differences according to IPSS-R: very low: 23.6 months, low: 24.8 months, intermediate 10.6 months, high 7.9 months, very high 5.5 months (P <0.001). Multivariate risk factors for relapse-free survival (RFS) were: IPSS-R, reduced intensity conditioning, graft source and prior treatment. A trend for an increased relapse incidence was noted for very high risk IPSS-R. We conclude that the IPSS-R at transplant is a useful prognostic score for predicting OS and RFS after transplantation, capturing both disease evolution and response to prior treatment before transplant.Peer reviewe

Validation of the revised IPSS at transplant in patients with myelodysplastic syndrome/transformed acute myelogenous leukemia receiving allogeneic stem cell transplantation: a retrospective analysis of the EBMT chronic malignancies working party

The International Prognostic Scoring System has been revised (IPSS-R) to predict prognosis of patients with myelodysplastic syndromes at diagnosis. To validate the use of the IPSS-R assessed before transplant rather than at diagnosis we performed a retrospective analysis of the EBMT database. A total of 579 patients had sufficient information available to calculate IPSS-R at transplant. Median overall survival (OS) from transplant was significantly different according to IPSS-R: very low 23.6 months, low 55.0 months, intermediate 19.7 months, high 13.5 months, very high 7.8 months (P<0.001). In a multivariate Cox model the following parameters were significant risk factors for OS: IPSS-R, graft source, age and prior treatment. Median relapse free survival also showed significant differences according to IPSS-R: very low: 23.6 months, low: 24.8 months, intermediate 10.6 months, high 7.9 months, very high 5.5 months (P<0.001). Multivariate risk factors for relapse-free survival (RFS) were: IPSS-R, reduced intensity conditioning, graft source and prior treatment. A trend for an increased relapse incidence was noted for very high risk IPSS-R. We conclude that the IPSS-R at transplant is a useful prognostic score for predicting OS and RFS after transplantation, capturing both disease evolution and response to prior treatment before transplant.status: publishe