The efficacy analysis of allogeneic hematopoietic stem cell transplantation in 48 leukemia patients with central nervous system leukemia / 中华血液学杂志

Objective: To investigate the efficacy of allogeneic hematopoietic stem cell transplantation (allo-HSCT) in the treatment of leukemia patients also suffering from central nervous system leukemia (CNSL) . Methods: A total of 48 leukemia patients with central nervous system leukemia admitted to our hospital from May 2012 to December 2017 were retrospectively analyzed. Results: ① Including 22 cases of acute lymphocytic leukemia (ALL) , 21 cases of acute myeloid leukemia (AML) , and 5 cases of chronic myelogenous leukemia (CML) . Before transplantation, 19 patients achieved complete remission (CR) , and the rest 29 ones without remission. ②The conditioning regimen used TBI as the main protocol, and 6 patients were combined with whole brain and total spinal cord radiotherapy, 2 with Cyber knife treatment, and children with modified IDA combined with BUCY. ③All 48 patients were successfully transplanted, the median time for leukocyte engraftment was 14 (10-23) days, the median time for platelet transplant 16 (6-78) days. ④Bone marrow was evaluated 28 days after transplantation, all 48 patients reached CR, and DNA testing confirmed that they were all full donor chimerism. ⑤The median follow-up was 14 (2-69) months. Of them, 28 cases survived, 10 relapsed and the rest 3 had recurrence of CNSL after transplantation. One year after allo-HSCT, the overall survival (OS) of CR and non-CR groups were (77.3±10.0) % and (57.6±9.3) % (P=0.409) , respectively, the disease-free survival rates (DFS) were (71.2±11.0) % and (53.9±9.5) % (P=0.386) , respectively. The 1-year OS rates of ALL and AML groups after transplantation were (54.2±10.7) %, (80.1±8.9) %, respectively (P=0.200) , and DFS rates were (49.2±10.8) %, (75.0±9.7) % (P=0.190) , respectively. Conclusion: Allo-HSCT was safe and effective for leukemia patients with CNSL.

Improved small moving target detection method in infrared sequences under a rotational background.

The infrared image sequence contains both the rotational background and a moving target, causing great difficulties in target detection and the occurrence of massive false alarm rates. This paper proposes an improved method using an optical flow field, which can estimate and compensate for the rotational motion background, thus detecting a small moving target. First of all, we select the Shi-Tomasi angular points for image detection and represent the background rotation with the sparse optical flow field of a complete image. Then we use the least squares method to estimate the parameters of the perspective model of background rotation so as to reconstruct the background motion vector field and compensate for background rotation. Finally we detect the small moving target with the differential method and the morphological treatment. The experimental results verify that this method can accurately detect a small moving target against the violently rotational background and provide an idea for the target interception algorithm under the condition that an infrared imaging seeker is overlooking.

Prognostic Analysis of Minimal Residual Disease from Acute Myeloid Leukemia after Allogeneic Hematopoietic Stem Cell Transplant by Flow Cytometry / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To investigate the value of flow cytometry (FCM) detection in prognostic evaluation of minimal residual disease (MRD) of acute myeloid leukemia (AML) patients after allogeneic hematopoietic stem cell transplantation (allo-HSCT).</p><p><b>METHODS</b>Eighty-two cases of AML (except M3) after allo-HSCT who accord to enrolled condition (no MRD positive after allo-HSCT confirmed by regular flow cytometry detection and followed-up for 2 years) from April 2012 to September 2016 in our department were selected. Among 82 cases males were 50 and females were 32 with average age of 27.27 (2-57) years old. According to FAB classification, 2 cases were classified as M0/M1, 51 cases as M2, 24 cases as M4/M5 and 5 cases as M6. The antibody panels were selected accordingly to the initial leukemia associated immunophentype(LAIP) of patients.</p><p><b>RESULTS</b>Twenty patients (24.39%) were identified as MRD(0.10%-4.91%, mean 1.64%) in 82 AML patients after allo-HSCT (all the patients were in complete remission phase based on bone marrow morphology). During follow-up, 16 cases relapsed (relapse rate 80%)in 20 MRDcases, including 1 case with extramedullary relapse; 4 out of 62 MRDcases relapsed (relapse rate 6.45%)in bone marrow, and 2 cases extramedullary relapsed. The average survival time of leukemia- free survival (LFS) in group MRDwas 15.19 ± 3.99 months, median LFS was 10± 3.84 months. The average LFS time was 53.50 ± 1.69 months in MRDgroup (P<0.001). The average overall survival (OS) of the MRDgroup was 22.52 ± 5.72 months, the median OS was 18 ± 3.27 months; the average OS time was 42.86 ± 2.83 months in MRDgroup(P=0.008).</p><p><b>CONCLUSION</b>For the patients with morphologically complete remission after allo-SCT, the FCM regular monitoring of bone marrow MRD closely relates with its relapse rate, LFS and OS. Compared with the MRDgroup, the relapse rate of MRDgroup is significantly increases, and the LFS and OS significantly decreases.</p>

Effects of CD34(+) selected stem cells for the treatment of poor graft function after allogeneic stem cell transplantation / 中华血液学杂志

Objective: To evaluate the efficacy and safety of purified CD34(+) stem cell boost in the treatment of poor graft function (PGF) after allogeneic hematopoietic stem cell transplantation (HSCT) . Methods: 12 patients with poor graft function, reported in our hospital during January 2014 to March 2018, were retrospectively analyzed; The donors of 12 patients were HLA mismatched family members, and all treated with donor purified CD34(+) stem cell after G-CSF mobilization, calculating and statistical analyzing the purity of separation and the recovery rate of CD34(+) stem cells. The related complications and the recovery of blood cells after infusion were observed. Results: The purity of CD34(+) cells in the separation products was 92.0% (44.0%-97.0%) , and the recovery rate was 55.0% (45.0%-96.7%) . The median number of CD34(+) cells was 1.9 (0.9-4.4) ×10(6)/kg with CD3(+) cells as 0.6 (0.3-2.0) ×10(4)/kg. The median durations of white blood cells, platelet and red blood cells recoveries were 18 (14-39) , 29 (16-153) and 60 (9-124) days, respectively. All 12 patients didn't experience serious adverse reactions in the process of infusion, 10 patients achieved hematopoietic recovery, 1 case partial remission, 1 case no recovery, without occurrence of aggravated infection, graft versus host disease and other complications. Conclusion: The infusion of donor purified CD34(+) stem cell was a safe and effective method for PGF after allogeneic HSCT.

Clinical Analysis of Treating EBV Infection Accompanied with GVHD after Allon-HSCT by EBV-Specific Cytotoxic T Lymphocytes / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To investigate the efficiency and safety of treating Epstein-Barr virus (EBV) infection of acute graft versus host disease (GVHD) after allogeneic hematopoietic stem cell transplantation (allo-HSCT) by EBV specific cytotoxic T lymphocytes (EBV-CTL).</p><p><b>METHODS</b>The Clinical characteristics, therapeutic efficacy and safety of 12 patients with EBV infection treated by EBV-CTL infusion after allo-HSCT in Department of Hemahlogy of Aero Space Center Hospital between Jan 2015 and May 2017 were analyzed retrospectioely.</p><p><b>RESULTS</b>Our of 12 cases received EBV-CTL infusion after transplantation, 9 did not received Rituximab therapy due to the active infection, 4 cases including 3 received Ritaximab progressed into posttransplantation lymphoroliferetive disease (PTLD). The median time of EBV infection was 47 (22-71) days, median time of antivirus therapy before tramplantation was 10 (8-33) days, median time of first CTL infusion was 59(34-86) days after transplatation. The 43 cases-time CTL infusion was performed smoothly, no related harmful evnts occoured, no progression of GVHD was observed. After the first course of infusion, complete remission (CR), Partial remssion (PR) and no remssion (NR) were obtained in 9, 1 and 2 patients respectively, the relapse was observed in 4 patients who then received the socond course of infusion and all reached CR, the patient in PR did not reathed CR finally and died of GVGD at 5 months after transpplantation . Only 1 out of 2 cases of NR obtained CR, another 1 still was in NR, and died of transplantation related infection at 5 months after transplantation. 4 cases of PTLD were all cared.</p><p><b>CONCLUSION</b>Preliminary results of this study suggest that EBV-CTL infusion is safe for the EBV infection combined with acute GVHD after all-HSCT. However, a further larger scale clinical studies are needed to prove the efficiency.</p>

Four Cases of Wernicke's Encephalopathy Following Hematopoietic Stem Cell Transplantation / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To make through introduction of Wernicke's encephalopathy (WE) following hematopoietic stem cell transplantation (HSCT) in terms of clinical characteristics, diagnostic process and treatment.</p><p><b>METHODS</b>The clinical charactaristics, diagnostic and therapeutic process and prognostic follow-up in 4 patients diagnosed of WE following HSCT between January 2016 to January 2017 at Department of Hematology, Chinese Aerospace Center Hospital were retrospectively analyzed.</p><p><b>RESULTS</b>Four patients included 2 ALL and 2 AML, and 3 males and 1 female, their age ranged from 8 to 20 years old. 4 patients accouted for about 3% of all petients who received HSCT at that time. Typical triad syndrome consisting of ocular motility disorders, ataxia, global confusion was seen in only 1 patient. However, confusion and heterophthongia as onset of this complication were seen in all patients. Cerebral computed tomograph scan was universally unremarkable and useless. Cerebral MRI scan disclosed that typical involvement including thalamus, fourth ventricle, third ventricle, middle cerebral aqueduct was seen in 3, while untypical site including mamillary body was in the remaining 1 patient. All received vitamin B supplement therapy by intramuscular injection at a dose of 100 mg each day. Initial response was observed at 2, unknown, 3, 4 days after treatment and all obtained complete remission within 2 weeks without any event of relapse after median follow-up period of 8 (7-12) months.</p><p><b>CONCLUSION</b>Any recipient of HSCT with clinical signs or symptoms of central nervous system should receive vitamin B supplementary therapy immediately to decrease risk of mortality of WE even if the diagnosis of WE is uncertain.</p>

SrGe2B2O8 and Sr3Ge2B6O16: novel strontium borogermanates with three-dimensional and layered anionic architectures.

Two new alkaline-earth strontium borogermanates, namely, SrGe2B2O8 and Sr3Ge2B6O16, have been successfully synthesized through high-temperature solid state reactions. They represent the first examples of strontium borogermanates. SrGe2B2O8 crystallized in space group Pnma, and its structure features a novel three-dimensional [Ge2B2O8](2-) framework composed of alternative linkages of the B2O7 and Ge2O7 dimeric units with one-dimensional (1D) tunnels of eight-membered rings (MRs) along the b axis that are filled by the Sr(2+) cations. Sr3Ge2B6O16 is isostructural with Ba3Ge2B6O16 and crystallizes in centrosymmetric space group P1. Its structure features a two-dimensional layer that is composed of circular B6O16 clusters and GeO4 tetrahedra that are interconnected via corner sharing, forming 1D four- and six-MR tunnels along a axis. Sr(1) cations are located in the six-MR tunnels, whereas Sr(2) cations are located in the interlayer space. Studies of their optical properties and thermal stability as well as band structure calculations based on density functional theory methods have been also performed.

Fabrication of block copolymer brushes on hollow sphere surface via reverse iodine transfer polymerization.

The block copolymer brushes grafted from hollow sphere surface via reverse iodine transfer polymerization (RITP) were investigated in this work. A sufficient amount of azo initiator was introduced onto hollow sphere surface firstly. Then the monomer methyl methacrylate (MMA) was polymerized via surface-initiated reverse iodine transfer polymerization (RITP) using azo group modified hollow sphere as initiator. The microstructure of the samples was characterized by FT-IR, (1)H NMR, respectively. Results indicated that the poly(methyl methacrylate) (PMMA) with end functionality of alkyl iodine group had grafted from hollow sphere surface. TEM observations showed that the average diameter of hollow core was central at 1.3-1.4 µm and the average wall thickness increased from 103 nm to 138 nm and 172 nm after grafting polymerization of MMA and Tb complex, respectively. The closely linear plots of molecular weight (M(n)) versus conversion, linear kinetic plots for the free polymer formed in solution and the ability to extend the chains by sequential addition of monomer indicated that the RITP was a controlled process with a "living" characteristic.