Thawing of cryopreserved hematopoietic progenitor cells from apheresis with a new dry-warming device.

Background: Current thawing techniques of cryopreserved progenitor cells are based on the use of a water bath. The aim of this study has been to assess the progenitor cell viability and the time of hematopoietic engraftment after transplantation of cell products thawed with a new dry-thawing device.

Study Design And Methods: In the preclinical phase, two cryobags from the same patient were thawed with the standard technique and with the dry system method in parallel (n=5, Protocol A and Protocol B, respectively).

Cellular transplants in amyotrophic lateral sclerosis patients: an observational study.

Background Aims: Cytotherapy is a promising option for neurodegenerative disease treatment. Because of the fatal prognosis and imperative need for effective treatment, amyotrophic lateral sclerosis (ALS) patients request this therapy before its effectiveness has been verified. The increase in clinics offering cytotherapies but providing little scientific information has prompted considerable medical tourism.

Combined intermittent hypoxia and surface muscle electrostimulation as a method to increase peripheral blood progenitor cell concentration.

Background: Our goal was to determine whether short-term intermittent hypoxia exposure, at a level well tolerated by healthy humans and previously shown by our group to increase EPO and erythropoiesis, could mobilize hematopoietic stem cells (HSC) and increase their presence in peripheral circulation.

Methods: Four healthy male subjects were subjected to three different protocols: one with only a hypoxic stimulus (OH), another with a hypoxic stimulus plus muscle electrostimulation (HME) and the third with only muscle electrostimulation (OME). Intermittent hypobaric hypoxia exposure consisted of only three sessions of three hours at barometric pressure 540 hPa (equivalent to an altitude of 5000 m) for three consecutive days, whereas muscular electrostimulation was performed in two separate periods of 25 min in each session.

Cryopreservation of hematopoietic progenitor cells from apheresis at high cell concentrations does not impair the hematopoietic recovery after transplantation.

Background: The high number of nuclear cells (NCs) from hematopoietic progenitor cells-apheresis (HPC-A) requires cryopreservation in large volumes or at high NC concentrations. The effect of NC concentration during cryopreservation has yet to be examined.

Study Design And Methods: In the experimental arm (n = 610, Protocol B), the first HPC-A sample from the patient was cryopreserved in two cryobags and subsequent collections in one cryobag, resulting in high NC concentrations (>100 x 10(6) NCs/mL) in most cases.

Evaluation of an automated cell processing device to reduce the dimethyl sulfoxide from hematopoietic grafts after thawing.

Background: The direct transfusion of thawed hematopoietic progenitor cells (HPCs) is associated to transfusion-related side effects that are thought to be dose-dependent on the infused dimethyl sulfoxide (DMSO). Both the effectiveness of a fully automated cell processing device to washing out DMSO and the effects of DMSO elimination over the recovered cells were evaluated.

Study Design And Methods: Twenty cryopre-served peripheral blood HPC bags (HPC apheresis [HPC-A]) were thawed and processed for washing with an automated cell-processing device.

Mixed chimerism is frequent after allogeneic peripheral blood stem cell transplantation with positive CD34 selection, and is not reverted by low doses of donor T-cells add-back.

Unlabelled: The incidence of full donor chimerism (full DC) after CD34+ -selected peripheral blood stem cell transplantation (CD34+ -PBSCT) is controversial. Whereas the initial reports suggested a high incidence of full DC (hypothetically because of the high number of CD34+ cells infused) more recent works describe a high incidence of mixed lymphoid chimerism. There are no data concerning the ability of low-dose donor T-lymphocyte add-back on conversion to full DC.

Strategies to reduce transplant-related mortality after allogeneic stem cell transplantation in elderly patients: Comparison of reduced-intensity conditioning and unmanipulated peripheral blood stem cells vs a myeloablative regimen and CD34+ cell selection.

Objectives: The aim of this study was to compare two approaches used to reduce transplant-related mortality (TRM) after allogeneic peripheral blood stem cell transplantation (allo-PBSCT) in elderly patients.

Patients And Methods: Data from 50 patients, 45 years of age or older, consecutively treated with an HLA-identical sibling allo-PBSCT at the Hospital de Sant Pau were analyzed. We have compared the outcome of patients treated with conventional myeloablative regimens and CD34(+)-selected cells (CD34(+) group; n=23) with those receiving reduced-intensity conditioning regimens, consisting of fludarabine (150 mg/m(2)) plus an alkylating agent, followed by unmanipulated grafts (RIC group; n=27).

CD34+-enriched-CD19+-depleted autologous peripheral blood stem cell transplantation for chronic lymphoproliferative disorders: high purging efficiency but increased risk of severe infections.

Objective: The main objective of this work was to decrease the incidence of relapse after autologous stem cell transplantation with a "double purging" procedure.

Methods: We used a "positive" (CD34) and "negative" (CD19) double selection method to improve the efficacy of "single purging" of hematopoietic harvests in poor-prognosis lymphoproliferative disorders. All patients included in the study had a positive molecular marker of their disease.