Identification of cystic fibrosis transmembrane conductance regulator as a prognostic marker for juvenile myelomonocytic leukemia via the whole-genome bisulfite sequencing of monozygotic twins and data mining.

Background: Linked deoxyribonucleic acid (DNA) hypermethylation investigations of promoter methylation levels of candidate genes may help to increase the progressiveness and mortality rates of juvenile myelomonocytic leukemia (JMML), which is a unique myelodysplastic/myeloproliferative neoplasm caused by excessive monocyte and granulocyte proliferation in infancy/early childhood. However, the roles of hypermethylation in this malignant disease are uncertain. Methods: Bone marrow samples from a JMML patient and peripheral blood samples from a healthy monozygotic twin and an unrelated healthy donor were collected with the informed consent of the participant's parents. Whole-genome bisulfite sequencing (WGBS) was then performed. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed to analyze specific differentially methylated region (DMG) related genes. The target genes were screened with Cytoscape and Search Tool for the Retrieval of Interacting Genes/Proteins (STRING), which are gene/protein interaction databases. A data mining platform was used to examine the expression level data of the healthy control and JMML patient tissues in Gene Expression Omnibus data sets, and a survival analysis was performed for all the JMML patients. Results: The STRING analysis revealed that the red node [i.e., the cystic fibrosis transmembrane conductance regulator (CFTR)] was the gene of interest. The gene-expression microarray data set analysis suggested that the CFTR expression levels did not differ significantly between the JMML patients and healthy controls (P=0.81). A statistically significant difference was observed in the CFTR promoter methylation level but not in the CFTR gene body methylation level. The overall survival analysis demonstrated that a high level of CFTR expression was associated with a worse survival rate in patients with JMML (P=0.039). Conclusions: CFTR promoter hypermethylation may be a novel biomarker for the diagnosis, monitoring of disease progression, and prognosis of JMML.

M2-Macrophage-Derived Exosomes Promote Meningioma Progression through TGF-ß Signaling Pathway.

Tumor-associated macrophages (TAMs) have been shown to be an essential component of the tumor microenvironment and facilitate the proliferation and invasion of a variety of malignancies. However, the contribution of TAMs to meningioma progression has not been characterized in detail. In this study, we aimed to discover a novel regulatory pathway by which exosome-mediated M2-polarized macrophages participate in meningioma tumorigenesis and progression. Methods. First, the distribution and functional phenotype of macrophages in meningioma tissues were assessed by immunohistochemistry. Macrophage-derived exosomes (MDEs) were characterized, and further cell coculture experiments were performed to explore the effects of M2-MDEs on the proliferation, migration, and invasion of meningioma cells. RNA sequencing was used to analyze the transcriptomic signatures in meningioma cells treated with M2-MDEs. Three-dimensional tumorspheres and xenograft tumor models were used to evaluate the effects of M2-MDEs on meningioma tumorigenesis and development. Results. We found that M2 macrophages were enriched in meningioma tissue. Coculture with meningioma cells induced the M2 polarization of macrophages. We also found that M2-MDEs were able to significantly promote cell proliferation, cell migration, cell invasion, and tumorigenesis in meningiomas. Bioinformatic analysis suggested that the TGF-ß pathway was activated in meningioma cells treated with M2-MDEs. Functional experiments demonstrated that blocking the TGF-ß signaling pathway could effectively reverse the tumor-promotive effects mediated by M2-MDEs. Conclusions. Overall, our study showed that M2-MDEs promoted meningioma development and invasion by activating the TGF-ß signaling pathway. Targeting exosome-mediated intercellular communication in the tumor microenvironment may be a novel therapeutic strategy for meningioma patients.

Reduced intensity of early intensification does not increase the risk of relapse in children with standard risk acute lymphoblastic leukemia - a multi-centric clinical study of GD-2008-ALL protocol.

BACKGROUND: The prognosis of childhood acute lymphoblastic leukemia (ALL) is optimistic with a 5-year event-free survival (EFS) rate of 70-85%. However, the major causes of mortality are chemotherapy toxicity, infection and relapse. The Guangdong (GD)-2008-ALL collaborative protocol was carried out to study the effect of reduced intensity on treatment related mortality (TRM) based on Berlin-Frankfurt-Münster (BFM) 2002 backbone treatment. The study was designed to elucidate whether the reduced intensity is effective and safe for children with ALL. METHODS: The clinical data were obtained from February 28, 2008 to June 30, 2016. A total of 1765 childhood ALL cases from 9 medical centers were collected and data were retrospectively analyzed. Patients were stratified into 3 groups according to bone marrow morphology, prednisone response, age, genotype, and karyotype information: standard risk (SR), intermediate risk (IR) and high risk (HR). For SR group, daunorubicin was decreased in induction IA while duration was reduced in Induction Ib (2 weeks in place of 4 weeks). Doses for CAM were same in all risk groups - SR patients received one CAM, others got two CAMs. RESULTS: The 5-year and 8-year overall survival (OS), event-free survival (EFS) and cumulative incidence of relapse (CIR) were 83.5±0.9% and 83.1±1.0%, 71.9±1.1% and 70.9±1.2%, and 19.5±1.0% and 20.5±1.1%, respectively. The 2-year treatment-related mortality (TRM) was 5.2±0.5%. The 5-year and 8-year OS were 90.7±1.4% and 89.6±1.6% in the SR group, while the 5-year and 8-year EFS were 81.5±1.8% and 80.0±2.0%. In the SR group, 74 (15.2%) patients measured minimal residual disease (MRD) on Day 15 and Day 33 of induction therapy. Among them, 7 patients (9.46%) were MRD positive (≥ 0.01%) on Day 33. The incidence of relapse in the MRD Day 33 positive group (n=7) was 28.6%, while in the MRD Day 33 negative group (n=67) was 7.5% (p=0.129). CONCLUSIONS: The results of GD-2008-ALL protocol are outstanding for reducing TRM in childhood ALL in China with excellent long term EFS. This protocol provided the evidence for further reducing intensity of induction therapy in the SR group according to the risk stratification. MRD levels on Day 15 and Day 33 are appropriate indexes for stratification.

Prognostic Value and Outcome for ETV6/RUNX1-Positive Pediatric Acute Lymphoblastic Leukemia: A Report From the South China Children's Leukemia Group.

PURPOSE: To analyzed the outcome of ETV6/RUNX1-positive pediatric acute B lymphoblastic leukemia (B-ALL) with the aim of identifying prognostic value. METHOD: A total of 2,530 pediatric patients who were diagnosed with B-ALL were classified into two groups based on the ETV6/RUNX1 status by using a retrospective cohort study method from February 28, 2008, to June 30, 2020, at 22 participating ALL centers. RESULTS: In total, 461 (18.2%) cases were ETV6/RUNX1-positive. The proportion of patients with risk factors (age <1 year or ≥10 years, WB≥50×109/L) in ETV6/RUNX1-positive group was significantly lower than that in negative group (P<0.001), while the proportion of patients with good early response (good response to prednisone, D15 MRD < 0.1%, and D33 MRD < 0.01%) in ETV6/RUNX1-positive group was higher than that in the negative group (P<0.001, 0.788 and 0.004, respectively). Multivariate analysis of 2,530 patients found that age <1 or ≥10 years, SCCLG-ALL-2016 protocol, and MLL were independent predictor of outcome but not ETV6/RUNX1. The EFS and OS of the ETV6/RUNX1-positive group were significantly higher than those of the negative group (3-year EFS: 90.11 ± 4.21% vs 82 ± 2.36%, P<0.0001, 3-year OS: 91.99 ± 3.92% vs 88.79 ± 1.87%, P=0.017). Subgroup analysis showed that chemotherapy protocol, age, prednisone response, and D15 MRD were important factors affecting the prognosis of ETV6/RUNX1-positive children. CONCLUSIONS: ETV6/RUNX1-positive pediatric ALL showed an excellent outcome but lack of independent prognostic significance in South China. However, for older patients who have the ETV6/RUNX1 fusion and slow response to therapy, to opt for more intensive treatment.

[Nosocomial septicemia in the early stage after stem cell transplantation in children with major ß-thalassemia].

OBJECTIVE: To explore the clinical characteristics of nosocomial septicemia in the early stage after hematopoietic stem cell transplantation (HSCT) in children with major ß-thalassemia. METHODS: The clinical data were retrospectively analyzed of 55 consecutive children with major ß-thalassemia who developed septicemia early after HSCT between January, 2011 and June, 2016. RESULTS: Among the total of 416 consecutive children with major ß-thalassemia undergoing allogeneic HSCT, the incidence of nosocomial infection early after transplantation was 77.16% (321/416), and 55 (17.13%) children showed positive findings in blood culture test. The infections occurred most commonly in the oral cavity (65.5%), followed by the respiratory tract, intestinal tract and skin. Gram-negative bacteria, including Escherichia coli (27.3%), Klebsiella pneumoniae (21.8%) and Pseudomonas aeruginosa (9.1%), were the most common causes of infections. Fungal (Candida tropicalis) infection caused septicemia in 1 case. Of all the pathogens, extended-spectrum ß-lactamase (ESBL)-producing bacteria were found in 6 cases, methicillin-resistant Staphylococcus aureus (MRSA) in 2 cases, and multidrug-resistant (MDR) bacteria in 2 cases. CONCLUSION: Gram-negative bacteria are the major pathogens causing septicemia in children early after HSCT for major ß-thalassemia, and the bacteria show a high level of drug resistance. Adequate preventive use of antibiotics and care of the oral cavity, the respiratory tract, and the perianal region following the transplantation are important measures to control nosoconial infection in these children.

[Outcome of childhood high-risk acute lymphoblastic leukemia treated with the ALL-BFM 95 protocol].

OBJECTIVE: To evaluate the effectiveness and the practicability of the Acute Lymphoblastic Leukemia Berlin-Frankfurt-Münster 95 (ALL-BFM 95) protocol in treating childhood high-risk acute lymphoblastic leukemia (HR-ALL). METHODS: A retrospective analysis of 47 children with newly diagnosed HR-ALL between July 2003 and August 2013 was performed. These children were treated by the ALL-BFM 95 protocol. Survival was evaluated by Kaplan Meier analysis and Log-Rank test. RESULTS: Relapse-related death occurred in 12 of 47 patients (26%), and 5 of 47 patients (11%) were treatment-related mortality. Five-year probability of event-free-survival (pEFS) was 62%. Children with hematopoietic stem cell transplantation (HSCT) after chemotherapy achieved significantly better pEFS than those with chemotherapy alone (77% vs 52%; P=0.035). The patients who were only poor responders to prednisone had a better outcome (5-year pEFS 80%) than the Days 15 and 33 bone marrow M3 subgroups (5-year pEFS 60% and 0 respectively). CONCLUSIONS: ALL-BFM 95 protocol can improve the outcome of children with high-risk ALL. The major cause of death is attributed to relapse. Chemotherapy plus HSCT can produce a better outcome than chemotherapy alone. The Days 15 and 33 bone marrow M3 subgroups have a poor prognosis.

Assessment of iron overload in very young children with limited thalassemia care resources in South China.

Southern China has one of the world's largest population of patients needing transfusions. Transfusion and chelation are not uniformly available and no magnetic resonance imaging (MRI) assessment data exists to date. A total of 153 young ß-thalassemia major (ß-TM) patients were assessed using a validated 1.5T scanner in Hong Kong, People's Republic of China (PRC). Their median age was 13 (range 7 to 30), and most patients were young (22.0% age <10, 73.0% age <15, 88.0% age <18). Erratic health care made estimation of total transfusion and chelation exposure impossible. Despite their early age, 24.0% had severe cardiac hemosiderosis [T2*<10 milliseconds (ms)], at ages as early as 8 years old. Median heart iron was 1.68 mg/g dry weight (range 0.19-7.66) and increased with age (p = 0.017), while liver iron was 22.2 mg/g dry weight (range 3.15 to 39.2). Serum ferritin levels were poor predictors of heart and liver, or pancreatic R* and pituitary R* values. Magnetic resonance imaging scans are needed to screen very young ß-TM patients with immediate risk of premature cardiac death in developing nations and triage them to more intensive treatment. This is particularly important in countries with a large number of patients and limited resources. Our data suggests that in developing countries, there is no lower limit for thalassemia MRI scanning programs.

Biomolecule-assisted synthesis of highly stable dispersions of water-soluble copper nanoparticles.

Water-soluble and highly stable dispersions of copper nanoparticles were obtained using a biomolecule-assisted synthetic method. Dopamine was utilized as both reducing and capping agent in aqueous medium. The successful formation of DA-stabilized copper particles was demonstrated by ultraviolet-visible spectroscopy (UV-Vis), transmission electron microscopy (TEM), Zeta potential measurement, and Fourier transform infrared spectroscopy (FT-IR). The mechanism of dopamine on the effective reduction and excellent stability of copper nanoparticles was also discussed. This facile biomolecule-assisted technique may provide a useful tool to synthesize other nanoparticles that have potential application in biotechnology.

[Analysis of the risk factors for hemorrhagic cystitis after allogeneic hematopoietic stem cell transplantation for beta-thalassemia in children].

OBJECTIVE: To analyze the risk factors of hemorrhagic cystitis after allogeneic hematopoietic stem cell transplantation for beta-thalassemia in children. METHODS: The clinical records of 30 children with beta-thalassemia undergoing allogeneic hematopoietic stem cell transplantation between December, 2008 and November, 2009 were analyzed. RESULTS: Hemorrhagic cystitis occurred in 8 of the 33 patients with an incidence of 24.24%, including 1 with grade I, 6 with grade II and 1 with grade III hemorrhagic cystitis. The median time of hemorrhagic cystitis onset was 22.9 days (range 6-35 days) and the median duration was 11.9 days(range 3-27 days). Univariate analysis indicated that the different types of transplantation and acute graft-versus-host disease affect the occurrence of hemorrhagic cystitis. The children with Allo-PBSCT had higher incidence than those receiving Allo-PBSCT+Allo-UBT and Allo-BMT (P<0.05). The children at an age >or=6 years had obviously higher incidence of hemorrhagic cystitis than those at younger ages. CONCLUSION: Age is the major factor that affects the occurrence of hemorrhagic cystitis in children undergoing allogeneic hematopoietic stem cell transplantation for beta-thalassemia.

Surgical treatment of pectus excavatum: 30 years 398 patients of experiences.

PURPOSE: The aim of the study is to review the surgical experiences with pectus excavatum (PE) chest deformities at the Department of Pediatric Surgery, West China Hospital of Sichuan University (Sichuan, PR China), during a 30-year period. METHOD: Records of 398 PE patients (396 congenital, 2 acquired) who underwent surgical repair between 1975 and 2005 were reviewed. Modified sternal elevation was applied in all patients. Repair was performed with subperiosteal resection of the abnormal cartilages, transverse wedge osteotomy of the anterior sternum, and internal support with a metal strut for 1 year. Five technical details were strictly followed for each case. Three hundred twelve patients (78.39%) were followed up from 1 to 16 years. RESULT: There were no deaths. Normal contour of the costal cage was constructed postoperatively in 98.74% (393/398) of the patients. Exercise tolerance was improved, and cardiac function recovered to the healthy level of same age. But pulmonary function recovered slowly after surgery. CONCLUSIONS: The 5 technical details are key principles for sternal elevation. Normal appearance of chest wall can be recovered; normal cardiopulmonary function can be restored by the modified sternal elevation with excellent long-term physiologic, cosmetic results and low rate of complications.

[Effects of mouse bone marrow mesenchymal stem cells on the expression of chemokine receptors of spleenocytes after phytohemagglutinin stimulation].

OBJECTIVE: To explore the effect of mouse bone marrow mesenchymal stem cells (MSCs) on the expression of chemokine receptors in T lymphocytes in vitro. METHODS: Mouse bone marrow MSCs were separated with Percoll, cultured and expanded in low glucose DMEM. C57BL/6 mouse spleenocytes were cultured in the 24-hole flasks by the density of 1 x10(6)/hole. Phytohemagglutinin (PHA) was then added to the holes and cultured for 72 hrs. This study consisted of three groups. Groups A and B were co-cultured by adding MSCs as the ratio of 0.1 and 0.01 to spleenocytes respectively. The control group was cultured without MSCs. Three days later the suspended spleenocytes were harvested for detecting the expression of three chemokine receptors CXCR3, CCR5 and CCR7 in T lymphocytes by the flow cytometry. RESULTS: The expression of CD3(+)CCR5(+) and CD3(+)CCR7(+) were statistically different among the three groups. Group A had the strongest expression, followed by group B and the control group. The expression of CD3(+)CXCR3(+) in group A was statistically higher than that in group B and the control group. CONCLUSIONS: MSCs could up-regulate the expression of chemokine receptors CXCR3, CCR5 and CCR7 in T lymphocytes stimulated by PHA.

[Analysis of therapeutic effectiveness of Nanfang ALL 99 protocol in childhood acute lymphoblastic leukemia patients].

OBJECTIVE: With more precise diagnostic criteria and risk classifications, more effective therapy administered in clinical trials, and better supportive care, the outcome of children with acute lymphoblastic leukemia (ALL) has been improved dramatically. Today, approximately 80% of children treated for this disease in developed countries enjoy long-term event free survival (EFS) and in most instances, would be cured. In this study, treatment outcome of 82 childhood ALL patients in the hospital were analyzed, and ways for how to improve the EFS rate in childhood ALL were explored. METHODS: Eighty-two patients with ALL were enrolled into the Nanfang ALL 99 protocol which derived from German BFM ALL 95 and Hong Kong-Singapore acute lymphoblastic leukemia 97 (HK-SG ALL 97). Dexamethasone instead of hydrocortisone was used for triple intrathecal therapy. Standard at risk patients who had been irregularly treated in other hospitals for short periods of time were classified as at intermediate risk. When ANC was > or = 1.0 x 10(9)/L and platelet > or = 100 x 10(9)/L, chemotherapy was started. Life table method was used to estimate survival rate and statistical analysis was done by using software SPSS for Windows. RESULTS: From March 1999 to September 2003, 82 childhood ALL patients were treated with the Nanfang ALL 99 protocol and 78 (95.1%) patients attained complete remission (CR) in a median time of 33 days. Out of 82 patients, 13 patients dropped out of the the Nanfang ALL 99 protocol because of financial difficulty or other reasons. Sixty nine patients were consecutively treated with the Nanfang ALL 99 protocol. The overall EFS rate at 2 years, 3 years and 5 years were 91.3%, 85.9% and 75.2%, respectively, with a median observation duration of 34 months. Three patients died of complications (4.3%). The disease relapsed in 6 patients and they died finally. CONCLUSION: The outcome of patients treated with the Nanfang ALL 99 protocol was favorable, and the mortality rate of this chemotherapeutic protocol was low. This protocol was well tolerated by Chinese patients and therefore the protocol is worthy of application in China.

[Allogeneic hematopoietic stem cell transplantation for beta-thalassemia major].

OBJECTIVE: To investigate the effect of hematopoietic stem cell transplantation (HSCT) for beta-thalassemia major. METHODS: Fifteen beta-thalassemia major patients with a median age of 3. 5 years (range 1 - 10 years) received allogeneic HSCT. According to the Pesaro's classification for thalassemia, 12 patients were grade I - II, and 3 grade III. The bone marrow transplantation (BMT) plus peripheral blood stem cell (PBSC) transplant mobilized by granulocyte colony-stimulating factor (G-CSF) was used when donor is low body-weight. RESULT: Of the fifteen patients, nine were disease-free survival (DFS) at a median follow-up of 2.5 years (range 6 - 54 months). Of eight grade I - II patients received HLA identical sibling BMT, seven were DFS, and of two received HLA mismatched marrow from their mother, one DFS, another not engrafted. Two patients received unrelated cord blood HSCT were both not engrafted. Two patients received PBSC transplantation alone were not engrafted, but one of them soon received BMT from the same donor and was DFS. The incidences of grade I - II and grade III acute graft-versus-host disease (aGVHD) were 20% (3/15) and 6.7% (1/15), respectively. Interstitial pneumonia occurred in 4/15 (26.7%) patients. There were no long-term complications in the survivors. CONCLUSION: Grade I - II beta-thalassemia major patients received HLA identical sibling BMT had higher DFS. It was propitious for engraftment to use BMT plus PBSC, but with a higher incidence of acute and chronic GVHD.