A prospective multicenter study investigating rituximab combined with intensive chemotherapy in newly diagnosed pediatric patients with aggressive mature B cell non-Hodgkin lymphoma (CCCG-BNHL-2015): a report from the Chinese Children's Cancer Group.

The evidence for the safety and efficacy of adding rituximab to intensive chemotherapy in pediatric patients with aggressive mature B cell non-Hodgkin lymphoma/leukemia (B-NHL/B-AL) is not yet robust. In this prospective multi-institutional trial, 419 evaluable patients ≤ 16 years of age with newly diagnosed B-NHL/B-AL were enrolled. Patients were stratified into 4 risk groups according to stage, resection status, and serum lactate dehydrogenase. Patients in group R1 received 3 therapy courses in the treatment order A-B-A. Patients in group R2 received 5 courses A-B-A-B-A. Patients in group R3 received 6 courses A-BB-AA-BB-AA-BB. For patients in group R4, rituximab was added to the chemotherapy backbone for patients in R3 (A-RBB-RAA-RBB-RAA-BB). At a median follow-up of 54 months, the 4-year event-free survival (EFS) for the entire group was 88.3 ± 1.6% (76.0 ± 4.3% in the historical study). The EFS rates according to the intention-to-treat principle were 100%, 98.6 ± 1.2%, 94.2 ± 1.8%, and 73.5 ± 3.7% for patients in treatment groups R1, R2, R3, and R4, respectively (P < 0.001). There were 9 (2.1%) toxic deaths due to infection during treatment. Regarding the toxicities of rituximab, grade 3/4 thrombocytopenia, mucositis, and infection occurred in 44.0%, 33.3%, and 64.0% after courses R-BB and grade 3/4 neutropenia, thrombocytopenia, and infection occurred in 96.3%, 77.8%, and 54.1% after courses RAA. The addition of rituximab to intensive chemotherapy is feasible even in a developing country. EFS was significantly improved when compared with the historical data. clinicals.gov identifier: NCT02405676.

Genetic Analysis of Two Novel GPI Variants Disrupting H Bonds and Localization Characteristics of 55 Gene Variants Associated with Glucose-6-phosphate Isomerase Deficiency.

OBJECTIVE: Glucose-6-phosphate isomerase (GPI) deficiency is a rare hereditary nonspherocytic hemolytic anemia caused by GPI gene variants. This disorder exhibits wide heterogeneity in its clinical manifestations and molecular characteristics, often posing challenges for precise diagnoses using conventional methods. To this end, this study aimed to identify the novel variants responsible for GPI deficiency in a Chinese family. METHODS: The clinical manifestations of the patient were summarized and analyzed for GPI deficiency phenotype diagnosis. Novel compound heterozygous variants of the GPI gene, c.174C>A (p.Asn58Lys) and c.1538G>T (p.Trp513Leu), were identified using whole-exome and Sanger sequencing. The AlphaFold program and Chimera software were used to analyze the effects of compound heterozygous variants on GPI structure. RESULTS: By characterizing 53 GPI missense/nonsense variants from previous literature and two novel missense variants identified in this study, we found that most variants were located in exons 3, 4, 12, and 18, with a few localized in exons 8, 9, and 14. This study identified novel compound heterozygous variants associated with GPI deficiency. These pathogenic variants disrupt hydrogen bonds formed by highly conserved GPI amino acids. CONCLUSION: Early family-based sequencing analyses, especially for patients with congenital anemia, can help increase diagnostic accuracy for GPI deficiency, improve child healthcare, and enable genetic counseling.

Clinical Analysis and Mental Health Survey of Hemophilia Carriers: a Cross-sectional Study.

OBJECTIVE: Hemophilia carriers (HCs), who are heterozygous for mutations in the clotting factor VIII/clotting factor IX gene (F8 or F9), may have a wide range of clotting factor levels, from very low, similar to afflicted males, to the upper limit of normal, and may experience mental health issues. The purpose of this study was to provide genetic information on mothers of hemophilia patients and to understand the clotting factor activity and phenotype of HCs. Additionally, we aimed to investigate the mental health status of HCs in China. METHODS: A total of 127 hemophilia mothers, including 93 hemophilia A (HA) mothers and 34 hemophilia B (HB) mothers, were enrolled in this study. Long distance PCR, multiplex PCR, and Sanger sequencing were used to analyze mutations in F8 or F9. Coagulation factor activity was detected by a one-stage clotting assay. The Symptom Checklist 90 (SCL-90, China/Mandarin version) was given to HCs at the same time to assess their mental health. RESULTS: A total of 90.6% of hemophilia mothers were diagnosed genetically as carriers, with inversion in intron 22 and missense mutations being the most common mutation types in HA and HB carriers, respectively. The median clotting factor level in carriers was 0.74 IU/mL (ranging from 0.09 to 1.74 IU/mL) compared with 1.49 IU/mL (ranging from 0.93 to 1.89 IU/mL) in noncarriers, of which 14.3% of HCs had clotting factor levels of 0.40 IU/mL or below. A total of 53.8% (7/13) of HA carriers with low clotting factor levels (less than 0.50 IU/mL) had a history of bleeding, while none of the HB carriers displayed a bleeding phenotype. The total mean score and the global severity index of the SCL-90 for surveyed HCs were 171.00 (±60.37) and 1.78 (±0.59), respectively. A total of 67.7% of the respondents had psychological symptoms, with obsessive-compulsive disorder being the most prevalent and severe. The pooled estimates of all nine factors were significantly higher than those in the general population (P<0.05). CONCLUSIONS: The detection rate of gene mutations in hemophilia mothers was 90.6%, with a median clotting factor level of 0.74 IU/mL, and 14.3% of HCs had a clotting factor level of 0.40 IU/mL or below. A history of bleeding was present in 41.2% of HCs with low clotting factor levels (less than 0.50 IU/mL). Additionally, given the fragile mental health status of HCs in China, it is critical to develop efficient strategies to improve psychological well-being.

Retraction: Down-regulation of MRPS23 inhibits LPS-induced proliferation and invasion via regulation of the NF-κB signaling pathway in osteosarcoma cells.

[This retracts the article DOI: 10.1039/C8RA08973F.].

The novel HLA-DQB1*06:208:02 allele, identified by Sanger dideoxy nucleotide sequencing in a Chinese individual.

HLA-DQB1*06:208:02 differs from HLA-DQB1*06:02:02 by one nucleotide in exon 2.

[Clinical application of targeted sealing with high viscosity bone cement and secondary injection of low viscosity bone cement in vertebroplasty].

OBJECTIVE: To observe the clinical efficacy of targeted sealing with high viscosity bone cement and secondary injection of low viscosity bone cement in the treatment of OVCFs patients with the fracture lines involved vertebral body margin. METHODS: The elderly patients who underwent vertebroplasty for osteoporotic vertebral compression fractures from January 2019 to September 2021 were selected as the screening objects. Through relevant standards and further CT examination, 56 patients with fracture lines involving the anterior wall or upper and lower endplates of the vertebral body were selected for the study. There were 21 males and 35 females, aged from 67 to 89 years old with an average of (76.58±9.68) years. All 56 patients underwent secondary injection of bone cement during operation. Only a small amount of high viscosity cement was targeted to seal the edge of the vertebral body for the first time, and low viscosity cement was injected to the vertebral bodies during second bolus with well-distributed. The operation time, bone cement volume and bone cement leakage were recorded, and the pain relief was evaluated by visual analogue scale (VAS). RESULTS: All patients were followed up for more than 3 months and the surgeries were successfully complete. The operation time was (50.41±10.30) min and the bone cement volume was (3.64±1.29) ml. The preoperative VAS was (7.21±2.41) points, which decreased significantly to (2.81±0.97) points 3 days after operation(P<0.05). Among the 56 patients, 2 cases(3.57%) had bone cement leakage, 1 case leaked to the paravertebral vein, and 1 case slightly bulged to the paravertebral through the crack when plugging the vertebral crack. Both patients had no obvious clinical symptoms. CONCLUSION: In vertebroplasty surgery, targeted sealing of high viscosity bone cement and secondary injection of low viscosity bone cement can reduce intraoperative bone cement leakage and improve the safety of operation.

[Biological characteristics of T-lineage acute lymphoblastic leukemia in 23 children].

OBJECTIVE: To investigate the biological characteristics of childhood T-lineage acute lymphoblastic leukemia (T-ALL) and their clinical significance. METHODS: Immunophenotyping was performed by three-color flow cytometry analysis using CD45 /SSC gating in 23 children with newly diagnosed T-ALL. Meanwhile cytogenetic analysis was performed. RESULTS: CD3(+) expression of T-lineage antigens was apparently higher than CD7(+) and CD5(+) expression. CD19(+) expression of B-lineage antigens was apparently higher than CD22(+), CD10(+) and CD20(+) expression. Myeloid antigen was expressed in 4 cases (17%). CD34(+) and HLA-DR(+) were observed in 4 cases (17%) and 5 cases (22%), respectively. cCD3(+) and cCD79(+) were expressed in 23 cases (100%) and 22 cases (96%), respectively. The chromosome detection in 8 cases with T-ALL showed hyperdiploid or Ph(+) chromosome (one case each). The fusion gene detection in 5 cases showed MLL rearrangements in two cases and positive SIL/TAL1 fusion gene in one case. CD3 expression was related with the complete remission rate. CONCLUSIONS: Immunophenotyping is an important tool for diagnosis of T-ALL. However, the immunophenotype of T-ALL is heterogeneous. So, immunophenotyping along with cytogenetic and molecular genetic analysis is needed in the treatment and prognosis evaluation of T-ALL.

Screening of SARS-CoV-2 in 299 Hospitalized Children with Hemato-oncological Diseases: A Multicenter Survey in Hubei, China.

The SARS-CoV-2 infection status of hospitalized children was surveyed in the department of pediatric hematology and oncology in three different hospitals of epidemic areas in Hubei, China. A cross-sectional study was performed to investigate the clinical characteristics, lung CT scan, SARS-CoV-2 nucleic acid test and serum antibodies of hospitalized children with hemato-oncological diseases from January 23 to April 24, 2020. 299 children were enrolled in this study, including 176 males (58.9%) and 123 females (41.1%), aged from 2 months to 16 years. 255 cases (85.3%) received chemotherapy or other immunosuppressive therapies, and there were 44 cases (14.7%) of other benign diseases. Nucleic acid test was performed on 258 children (86.3%) and one case was positive. 163 cases (54.5%) were tested for serum antibodies, and all of them were negative. Lung CT scan was performed on 247 children (82.6%), and 107 of them showed infectious changes. Only one case (0.33%) of COVID-19 was diagnosed in the group. The prevalence rate of COVID-19 in enrolled children with hemato-oncological diseases in Hubei was 0.33%. Immunosuppressed patients are not prone to produce related antibodies. Comprehensive protective measures and ward management can reduce the risk of SARS-CoV-2 infection in the group patients.

[Association of human parvovirus B19 infection and childhood idiopathic thrombocytopenic purpura: a meta analysis of Chinese literatures].

OBJECTIVE: To study the relationship between human parvovirus B19 infection and childhood idiopathic thrombocytopenic purpura (ITP) by the principle of evidence based medicine. METHODS: Papers related to the relationship between human parvovirus B19 infection and childhood ITP published between 1994 and 2008 were retrieved electronically from the Chinese Journals Full-text Database and the Wanfang Data. These relevant papers on case-control trials were statistically studied by meta analysis. RESULTS: Eight papers that met the inclusion criteria were included for this meta analysis. Five hundred and sixteen cases of childhood ITP and 246 healthy controls were enrolled. The meta analysis showed that the incidence of human parvovirus B19 infection in the ITP group was significantly higher than that in the control group (OR=13.71, 95% CI=7.07-26.59, Z=7.75, p<0.01). CONCLUSIONS: Human parvovirus B19 infection is closely associated with childhood ITP.

[Application of three-dimensional CT and image classification in percutaneous vertebraplasty for osteoporotic vertebral compression fractures].

OBJECTIVE: To explore the application of three-dimensional CT and image classification in the treatment of osteoporotic vertebral compression fracture(OVCFs) by percutaneous vertebroplasty(PVP). METHODS: A total of 90 patients with OVCFs who were treated with PVP in Linqu People's Hospital of Shandong Province from April 2016 to March 2018 were selected as subjects. There were 31 males and 59 females, aged from 63 to 84 years old. Bone mineral density measurements were performed in all patients to confirm the presence of osteoporosis and imaging examinations were performed to confirm the presence of vertebral fractures. The fracture area was determined by MRI fat surpressed image before operation and three-dimensional modeling was performed to calculate the volume of fracture area. Three dimensional CT imaging of bone cement in fracture area was performed after PVP and the volume ratio of bone cement in fracture area was calculated by computer aided design software, by which patients were divided into groups for study. Forty-one patients whose volume ratio of bone cement in fracture area less than 50% are control group and the rest of 90 patients are observation group. Visual analogue scale (VAS) and Oswestry Disability Index(ODI) were collected in two groups before operation and 1 day, 3 months after operation. The amount of bone cement was recorded after operation. RESULTS: All operations were successful. There were 3 cases of cement leakage in control group and 4 cases in observation group. All patients had no obvious clinical symptoms. After continuous observation and follow-up for 3 months, no complications such as adjacent vertebral fracture, infection, bone cement displacement were found. There was no significant difference in bone cement doses and bone cement leakage between two groups(P>0.05). There was no significant difference in preoperative VAS and ODI between two groups(P>0.05). All VAS and ODI obviously decreased(P<0.05) at 1 day after operation and in observation group the decrease was more significant (P<0.05). At 3 months after operation there was no significant difference between two groups. This may have been due to basically healing of vertebral fractures at 3 months after surgery and the pain was no longer significantly related. CONCLUSIONS: PVP can significantly improve clinical symptoms of OVCFs and bone cement filling in fracture area is the key to the short-term effect of PVP.

The Role of Endolymphatic Hydrops in Patients with Pantonal Idiopathic Sudden Sensorineural Hearing Loss: A Cause or Secondary Reaction.

The purpose of this study was to investigate the presence of endolymphatic hydrops (EH) in both affected and unaffected ears of patients with pantonal unilateral idiopathic sudden sensorineural hearing loss (ISSNHL) using three-dimensional fluid-attenuated inversion recovery magnetic resonance imaging (3D-FLAIR MRI) and further evaluate the significance of EH in this disorder. Twenty-seven ISSHL patients were enrolled in this study. 3D-FLAIR MRI was performed 24 h after intratympanic injection of gadolinium-diethylenetriaminepentaacetic acid (Gd-DPTA). The incidences of EH in the affected ears and contralateral unaffected ears were compared and the correlations of EH with vertigo or prognosis were analyzed using the Chi-square test. The results showed that the incidence of EH was 68.0% (17/25) in the affected ears and 34.8% (8/23) in the unaffected ears. There was a statistically significant difference between affected ears and unaffected ears in regard to the incidence of EH (P<0.05). There were no significant correlations of EH with vertigo (P=1.000) or with prognosis (P=0.359) in the affected ears. In conclusion, there is EH in the inner ear of patients with pantonal ISSNHL; EH is not related to vertigo, a concomitant symptom of ISSNHL, and the prognosis of this condition. The presence of EH may be a secondary reaction following the impairment of the inner ears with pantonal ISSNHL.

Down-regulation of MRPS23 inhibits LPS-induced proliferation and invasion via regulation of the NF-κB signaling pathway in osteosarcoma cells.

Mitochondrial ribosomal protein S23 (MRPS23), encoded by a nuclear gene, is a participant in the translation of mitochondrial proteins. Recently, MRPS23 has been reported to be overexpressed in many types of cancers and have a close association with cancer progression. However, the specific roles of MRPS23 in osteosarcoma (OS) remain unknown. In this study, we investigated the expression pattern and biological functions of MRPS23 in OS cells. Our results demonstrated that MRPS23 was up-regulated in OS tissues and cell lines. Down-regulation of MRPS23 significantly inhibited OS cell proliferation and invasion induced by lipopolysaccharide (LPS) in vitro. Furthermore, the in vivo experiments showed that MRPS23 down-regulation markedly suppressed OS cell growth and metastasis induced by LPS. Mechanistically, down-regulation of MRPS23 inhibited the activity of NF-κB signaling pathway in OS cells. In conclusion, these findings indicated that MRPS23 may be a potential therapeutic target for OS treatment.

A Retrospective Analysis of Intracranial Hemorrhage in Children with Hemophilia A.

To investigate the incidence, risk factors, clinical manifestations and prognosis of intracranial hemorrhage (ICH) in children with hemophilia A in a center of China, we conducted a retrospective analysis of 126 children with hemophilia A at our hospital in recent 4 years. Thirty-six children with hemophilia A (including 19 severe cases, and 17 moderate cases complicated with joint diseases) received low dose factor VIII (FVIII) prophylaxis, and none of them had ICH. However, 13 cases of hemophilia A not given prophylaxis were complicated with ICH (12 severe cases, and 1 moderate case) and demonstrated an incidence of 10.3% (13/126) in all patients, and 28.6% (12/42) in severe cases. Of the 13 cases, 9 severe ICH cases had a definite history of head injury, accounting for 69.2%. Headache was common in children >3 years, but somnolence, irritability, gaze or convulsions in children <3 years. The most common findings of cranial CT scan included intracranial hematoma (9/13), and less commonly observed were subependymal hemorrhage and intraventricular hemorrhage. After administration of FVIII, all patients survived. Hematoma of 6 cases was observed during CT reexamination after 1-3 months. During the follow-up period, only one case had slight activity limitation on one side of the limb, but steadily recovered. Besides the decreased concentration of FVIII, trauma is the most common risk factor of ICH in children with hemophilia A. The active treatment can improve the prognosis of ICH in children with hemophilia A.

Expression of E-prostanoid receptors in nasal polyp tissues of smoking and nonsmoking patients with chronic rhinosinusitis.

BACKGROUND: Different inflammatory reactions have been observed in the polyp tissues of nonsmokers and smokers with chronic rhinosinusitis (CRS). E-prostanoid (EP) receptors play a role in the inflammatory processes. Cigarette smoke (CS) exposure regulates EP-receptor expression levels promoting inflammatory mediator release from various inflammatory cells. In this study, we characterize the EP-receptor expression profiles in the polyps of nonsmoking and smoking CRS patients to explore the possible role of CS in the pathogenesis of chronic rhinosinusitis with nasal polyps (CRSwNP). METHODS: Polyp biopsies were obtained from 28 non-smoking and 21 smoking CRSwNP patients. Histopathological characteristics were observed under a light microscope. The prostaglandin E2 (PGE2), TNF-α, and IL-8 contents in polyp tissues were detected using enzyme-linked immunosorbent assay. Immunostaining was used to locate EP receptors in polyps. Messenger RNA and protein expression of EP receptors were examined using quantitative real-time polymerase chain reaction and Western blot, respectively. RESULTS: More severe inflammatory reactions occurred in polyp tissues of smoking CRSwNP patients. The PGE2, TNF-α, and IL-8 in tissue homogenate levels were significantly higher in smoking CRSwNP patients than those in nonsmoking CRSwNP patients. Moreover, the distribution of each EP receptor subtype was similar in both groups. Compared with the EP-receptor expression in nonsmokers, messenger RNA and protein of EP2 and EP4 receptor were significantly down-expressed in smoking patients, but EP1 and EP3 receptors did not show significant differences. CONCLUSION: CS exposure downregulates the expression levels of EP2 and EP4 receptors and stimulates the production of PGE2 and the proinflammatory cytokine IL-8 and TNF-α in polyp tissues of CRS patients. The down-expressed EP2 and EP4 receptors might be associated with severe inflammatory reactions in smoking CRSwNP patients.

[Expression of Daxx in children with acute leukemia].

OBJECTIVE: To investigate Daxx expression and its clinical significance in children with acute leukemia. METHODS: The expression of Daxx protein was detected by immunohistochemical assay in 50 children with newly diagnosed acute leukemia (34 cases of acute lymphocytic leukemia and 16 cases of acute non-lymphocytic leukemia). Twenty children with normal bone marrow were used as the control group. RESULTS: Daxx protein was expressed in 38.0% of 50 children with acute leukemia, which was significantly higher than that of the control group (5.0%) (P < 0.05). The children with acute non-lymphocytic leukemia had significantly higher Daxx expression levels (62.5%) than those with acute lymphocytic leukemia (26.5%; P < 0.05) as well as the control group (P < 0.05). There were no significant differences in the Daxx expression between acute lymphocytic leukemia children and the control group. Daxx protein was expressed in 55.6% of high risk group of acute lymphocytic leukemia but it was not expressed in standard risk group of acute lymphocytic leukemia (P < 0.05). CONCLUSIONS: Daxx expression is abnormal in children with acute leukemia and associated with some clinical features of acute leukemia, suggesting that it may play an important role in the genesis and development of acute leukemia.

Comparison of diagnosing and staging accuracy of PET (CT) and MIBG on patients with neuroblastoma: Systemic review and meta-analysis.

To perform a systemic review and meta-analysis of the diagnostic accuracy of PET (CT) and metaiodobenzylguanidine (MIBG) for diagnosing neuroblastoma (NB), electronic databases were searched as well as relevant references and conference proceedings. The diagnostic accuracy of MIBG and PET (CT) was calculated for NB, primary NB, and relapse/metastasis of NB based on their sensitivity, specificity, and area under the summary receiver operating characteristic curve (AUSROC) in terms of per-lesion and per-patient data. A total of 40 eligible studies comprising 1134 patients with 939 NB lesions were considered for the meta-analysis. For the staging of NB, the per-lesion AUSROC value of MIBG was lower than that of PET (CT) [0.8064±0.0414 vs. 0.9366±0.0166 (P<0.05)]. The per-patient AUSROC value of MIBG and PET (CT) for the diagnosis of NB was 0.8771±0.0230 and 0.6851±0.2111, respectively. The summary sensitivity for MIBG and PET (CT) was 0.79 and 0.89, respectively. The summary specificity for MIBG and PET (CT) was 0.84 and 0.71, respectively. PET (CT) showed higher per-lesion accuracy than MIBG and might be the preferred modality for the staging of NB. On the other hand, MIBG has a comparable diagnosing performance with PET (CT) in per-patient analysis but shows a better specificity.

[Expression of survivin and its location in bone marrow cells of childhood acute leukemia: relationship to therapeutic efficacy].

OBJECTIVE: Survivin, a unique member of the inhibitor of apoptosis protein (IAP) family, plays an important role in regulating both apoptosis and cell division. Overexpression of survivin is associated with increased risk of recurrence and poor outcome in cancer patients. This study aimed to investigate the expression of survivin and its location as well as the relationship between cellular location and expression of survivin and the therapeutic efficacy at the cellular level. METHODS: The expression of survivin protein was detected by immunohistochemical assay in bone marrow cells from 62 children with acute leukemia and 40 hospitalized children who did not have leukemia (Control group), and in a human acute T lymphocytic leukemia cell line (Molt-4 cells) treated in vitro with daunorubicin (DNR). Cell apoptosis was detected using flow cytometry. RESULTS: Survivin protein was expressed in 41.9% of the 62 children with acute leukemia but in only 5.0% of the Control group (chi(2)=16.66; P < 0.01). The expression rate of survivin was 46.2% in cytoplasm and 53.9% in nucleus in the children with acute leukemia (chi(2)0.3077; P> 0.05). However, the remission rate of patients in whom survivin expression was seen in the nucleus was significantly higher than that in patients in whom survivin was expressed in cytoplasm after chemotherapy. The survivin expression in Molt-4 cells decreased remarkably by DNR treatment in a time and dosage-dependent manner. DNR treatment also induced survivin transllocation from cytoplasm to nucleus and cell apoptosis in a time and dosage-dependent manner. CONCLUSIONS: Survivin may play an important role in the development and prognosis of childhood acute leukemia. The different expression pattern of survivin in the cytoplasm and the nucleus may be associated with therapeutic efficacy and prognosis in acute leukemia. DNR may reduce the survivin expression in leukemic cells and induce cell apoptosis.

Changes in endolymphatic hydrops visualized by magnetic resonance imaging after sac surgery.

The purpose of the study was to observe changes in endolymphatic hydrops by using intratympanic injection of gadolinium and magnetic resonance imaging (MRI) before and after endolymphatic sac surgery in patients with unilateral Meniere's disease. Thirteen patients with unilateral Meniere's disease undergoing endolymphatic sac surgery were retrospectively and prospectively analyzed. Three-dimensional fluid-attenuated inversion recovery or three-dimensional real inversion recovery MRI was performed 24 h after an intratympanic injection of gadolinium to grade the presence of endolymphatic hydrops. Among the 13 patients with hydrops confirmed by preoperative MRI, vestibular hydrops had no significant change in all patients; cochlear hydrops became negative in 2 patients, and remained unchanged in the other 11 patients after surgery. Definite vertigo attacks were substantially controlled in one patient and completely controlled in 12 patients during a follow-up period of 8-34 months after surgery. The hearing levels were improved in 3 patients, remained unchanged in 7 patients, and decreased in 3 patients. In conclusion, endolymphatic sac surgery does not always alleviate endolymphatic hydrops in patients with Meniere's disease. Relief from vertigo cannot always be attributed to the remission of hydrops. A change in hearing levels cannot be explained by hydrops status alone.

Expression profiles of prostaglandin E2 receptor subtypes in aspirin tolerant adult Chinese with chronic rhinosinusitis.

BACKGROUND: Several studies have indicated that prostaglandin E2 and E-prostanoid (EP) receptors play a role in the pathogenesis of chronic rhinosinusitis (CRS) in white populations. However, until now there was no report about EP receptor expression and its role in the pathophysiology of CRS in Chinese patients. OBJECTIVE: To investigate the expression profiles of EP receptors, including EP1, EP2, EP3, and EP4 receptors in different Chinese patients with CRS with aspirin tolerance. METHODS: Nasal biopsy specimens were obtained from 12 controls, 12 patients with CRS without nasal polyps (CRSsNP), 12 with eosinophilic CRS with nasal polyps (CRSwNP), and 16 with noneosinophilic CRSwNP. Histopathologic characteristics were observed under a light microscope. Immunostaining was used to examine tissue localization of EP receptors. Messenger RNA and protein expression of EP receptors were examined by means of quantitative RT-polymerase chain reaction and Western blot, respectively. RESULTS: Different types of CRS presented different histopathologic hallmarks. EP receptors were expressed mainly on epithelium, glands, and infiltrating inflammatory cells in nasal tissue. In controls, patients with CRSsNP, and those with noneosinophilic CRSwNP, EP4 mRNA levels were higher than EP1, EP2, and EP3 receptors. EP2 was downexpressed, and EP1 was upexpressed in patients with eosinophilic CRSwNP. When comparing EP receptor expression among different groups, Messenger RNA and protein of EP1 receptor were significantly enhanced in eosinophilic CRSwNP, but EP2, EP3, and EP4 receptors did not show significant differences. CONCLUSION: EP receptor expressions present different features in healthy subjects and patients with CRS. The upregulated EP1 receptor in eosinophilic CRSwNP might be associated with excessive infiltrations of eosinophils and other inflammatory cells. The accurate role of the four EP receptors in the pathogenesis of different CRS remains to be further explored.

CD133+ subpopulation of the HT1080 human fibrosarcoma cell line exhibits cancer stem-like characteristics.

The cancer stem cell (CSC) theory holds that a minority population within tumors possesses stem cell properties of self-renewal and multilineage differentiation capacity and provides the initiating cells from which tumors are derived and sustained. However, verifying the existence of these CSCs has been a significant challenge. The CD133 antigen is a pentaspan membrane glycoprotein proposed to be a CSC marker for cancer-initiating subpopulations in the brain, colon and various other tissues. Here, CD133+ cells were obtained and characterized from the HT1080 cell line to determine the utility of this marker for isolating CSCs from human fibrosarcoma cells. In this study, CD133+ cells were separated from HT1080 cells using magnetic beads and characterized for their proliferation rate and resistance to chemotherapeutic drugs, cisplatin and doxorubicin, by MTS assay. Relative expression of tumor-associated genes Sox2, Oct3/4, Nanog, c-Myc, Bmi-1 and ABCG2 was measured by real-time polymerase chain reaction (PCR). Clonal sphere formation and the ability of CD133+ cells to initiate tumors in BALB/c nude mice was also evaluated. We found that CD133+ cells showed a high proliferation rate, increased resistance to chemotherapy drugs and overexpression of tumor-associated genes compared with these features in CD133- cells. Additionally, CD133+ cells were able to form spherical clusters in serum-free medium with high clonogenic efficiency, indicating a significantly greater tumor-initiating potential when compared with CD133- cells. These findings indicate that CD133+ cells identified within the HT1080 human fibrosarcoma cell line possess many CSC properties and may facilitate the development of improved therapies for fibrosarcoma.