Objective To investigate the effects of all trans-retinoic acid (ATRA) on the expressions of iron metabolism-related genes and their products in K562 cells and the possible relationship. Methods (1) The characteristics of K562 leukemic cell differentiation induced by ATRA was evaluated by Benzidine, Wright's, NSE and NBT staining.(2) The expression levels of cellular surface antigens (CD71 and CD 13) in K562 cells cultured with ATRA were measured by flow cytometry. (3) IRP/IRE binding activity was assessed by RNA/protein band-shift assay.(4) Ferritin was determined by radioimmunoassay.(5) The mRNA expression levels of H-Fn, TfR and IRP2 in K562 cells cultured with different concentrations of ATRA were delineated by RT-PCR method, confirmed by sequencing of RT-PCR products. Results K562 cells could be induced to differentiate into neutrophils by ATRA, confirmed by cytochemical staining. The expression of CD71 decreased while CD13 increased. The mRNA expression levels of TfR and IRP2 were decreased while mRNA expression level of H-Fn was increased in K562 cells cultured with ATRA, compared to that in control cells. Concomitantly,IRP binding activity was significantly decreased but the level of ferritin was significantly increased in K562 cells cultured with ATRA. Conclusions During the course of K562 cells induction and differentiation to myelocytes by ATRA, the expression level of iron metabolism-related genes and products were changed but the upstream-regulation mechanism still remains unclear.

Objective To investigate the clinical features and therapeutic strategies of one patient with meningioangiomatosis ( MA ) complicated with intracranial aneurysm formation. Methods The clinical data of one patient with aneurysm-formed MA admitted to the Department of Neurosurgery,the First Affiliated Hospital of Sun Yat-sen University was analyzed retrospectively. The patient received emergency craniotomy and middle cerebral artery aneurysm clipping and evacuation of intracranial hematoma. The meningeal tissue around the aneurysm was taken for pathological examination. Results Microscopy revealed meningeal thickening in the patient with MA accompanied with intracranial aneurysm. Spindle cells around the meninges and perivascular tissue of cortical hyperplasia formed an annular and fence-like structure. The results of immunohistochemistry showed the hyperplastic vessels and perivascular fibroblast like spindle cells diffuse vimentin-positive;the hyperplastic vascular endothelial cells CD99,CD34 were positive;and the residual glial cells in the lesions showed glial fibrillary acidic protein positive. Conclusion MA complicated with intracranial aneurysm is rare. The vascular condition is poor. The shape of aneurysm is irregular,and the risk of bleeding is high. Excise the involved meningeal tissue and clip the aneurysm with microsurgical operation is the resonable treatment.

Objective To investigate the association between psychological stress and oxidative damage in TNM stage Ⅲ patients with poorly differentiated gastric adenecarcinoma (GA). Methods One hundred and six patients with newly diagnosed poorly differentiated GA were assessed using the Hamilton Depression Rating Scale (HAMD), Zung Self-rating Depression Scale (SDS), Zung Self-rating Anxiety Scale (SAS), Symptom Checklist 90 (SCL-90), activities of daily living (ADL) and other multiple-item qnestionnaires. Oxidative-stress-related parameters in serum and the expression of DNA repair genes were monitored during a pretreatment period. Results The patients were divided into depression and nondepression groups (Groups A and B, respectively) based on a HAMD score cutoff of 20. The mean SDS, SAS, SCL-90, ADL and passive coping scores were higher in Group A, whereas social support and quality of life were lower. Serum total antioxidant capacity, eatalase, superoxide dismutuse concentrations and anti-superoxide anion capacity (A-ASC) were significantly decreased in Group A, whereas serum malondialdehyde (MDA) and 8-hydroxy-deoxyguanosine (8-OHdG) levels were significantly increased. Pearson correlation analysis revealed that depression was pesitively correlated with MDA, SAS, SCL-90 and ADL, but negatively correlated with A-ASC. Furthermore, real-time PCR revealed that the expression levels of hOGG1 and APEX1 were increased in Group A. Conclusion Psychological stress might be related to impaired antioxidant system in patients with GA, and it presents the first evidence of the involvement of oxidative DNA damage in the pathogenesis of depression.

Objective:To investigate the efficacy of microsurgical treatment in cavernous sinus tumors.Methods:The clinical data of 87 patients with cavernous sinus tumor treated by microsurgery from January, 2010 to August, 2019 were analysed retrospectively. The surgical approaches and microsurgical skills for common tumors in Cavernous Sinus region were discussed. The follow-up included outpatient and telephone follow-ups, and the follow-up results were evaluated by KPS score.Results:Among the 87 cases, 57 were totally resected (65.5%), 14 were subtotal resected (16.1%) and 16 were major resected (18.4%). Hospitalisation ranged from 14 to 98 days, with an average of 29 days. Postoperative complications occurred in 30 cases with cranial nerve injury, 2 brain stem injury, 4 postoperative bleeding, 5 cerebrospinal fluid leakage, 4 infection, 1 Pituitary damage and 1 death. Prognosis and follow-up analysis showed 68 cases with KPS>60 and 66 with KPS>80 at 1 month after surgery; 74 with KPS>70 and 72 with KPS>80 at 3 months after surgery; 78 with KPS>80 by 12 months after surgery. During the follow-up period of 6-120 months, 3 cases died. Recurrence: 6 of incomplete resection of meningioma, were in 1-6 years after the surgery, 4 of incomplete resection of schwannoma in 1-8 years, 2 of pituitary adenoma respectively in 13 and 16 months after the surgery. There was no recurrence after reoperation. Two cases of chondrosarcoma, 3 of chordoma and 3 of germinoma were treated with radiotherapy, and during the follow-up, there was no progress of the focus. No tumor progression or recurrence was found in other cases during follow-up.Conclusion:Surgery of cavernous sinus tumor is difficult due to frequent postoperative complications. Reasonable preoperative plan, surgical approach and precise microsurgical techniques are the keys in reduction of postoperative complications and in the improvement of prognosis.

Objective To study a case series of thoracolumbar flexion-distraction fractures combined with compression of anterior and central columns to analyze the causes of its occult symptoms and explore the injury mechanism,imaging diagnosis and operative reduction of the fractures.Methods A retrospective study was carried out on data of 39 patients with thoracolumbar flexion-distraction fractures admitted into our hospital from May 2003 to December 2006.Of all,there were 17 patients with compression of anterior and central columns.The diagnostic value of imaging examinations such as X-ray,CT and MRI was evaluated.All patients were treated with posterior operation,in which simple distraction of the anterior and central columns was followed by compression and reduction of the posterior column from the rear axial direction.The clinical efficacy and safety of operation were assessed.Results The patients with compression of anterior and central columns accounted for 43.6% of all thoracolumbar flexion-distraction fractures.Before operation,six patients were misdiagnosed as simple compression fracture.Various kinds of imaging examinations detected the bone injury and/or ligaments complex injury of the posterior column at different degrees.The positive results on X-ray,CT,spiral CT multi-planar reconstruction (MPR)and MRI were in 8,7,11 and 17 patients respectively.After simple posterior distraction in 17 patients,there occurred over distraction in eight patients who were cured with posterior recompression plus reduction.Conclusions The posterior column injury of thoracolumbar flexion-distraction fractures combined with compression of anterior and central columns is relatively occult and easy to be misdiagnosed as simple compression fracture,when MPR CT and MRI are helpful for diagnosis.The operation with twostep reduction of axial distraction followed by compression can attain satisfactory and safe results.

Objective · To investigate the clinical characteristics and multidisciplinary treatment of children with clear cell sarcoma of kidney (CCSK). Methods · Data of seven children with CCSK treated at Xinhua Hospital, Shanghai Jiao Tong University School of Medicine between Jan 2011 and Jan 2016 were collected. The retrospective analysis of clinical manifestations, features of imaging and pathology, treatment, and follow-up was performed. Results · Of 7 children with CCSK, 6 were male and 1 was female with the median age of 28 months (4-59 months), and 3 were at stageⅠ, 2 at stage Ⅲ, and 2 at stage Ⅳ. All cases were discussed and evaluated by multidisciplinary teams, including pediatric hematology/oncology, pediatric surgery, pathology, radiology and radiotherapy. CCCG-WT-2009 protocol was adopted to treat these patients. The median follow-up period was 22 months (8-56 months). Six children survived and one died. Conclusion · The multidisciplinary treatment mode can effectively improve the prognosis of CCSK. CCCG-WT-2009 protocol has good therapeutic effect and high cure rate for children with early stage CCSK, but the treatment of advanced stage CCSK needs to be further explored and perfected.

Objective To evaluate the clinical application of multimodality treatment of brain arteriovenous malformation (BAVM) with Onyx embolization and microsurgery.Methods There were 48 patients with BAVM treated by combination of Onyx embolization and microsurgery.The clinical features,therapeutic process,complications and discharge status (by MRI,DSA and Glasgow outcome scale,GOS) were recorded in detail.The prognosis was estimated by modified Rankin scale (mRS) with 6-42 months' follow-up.Results The total resection rate was 97.9％.The therapy-related complications happened in 8 patients (16.7％).Among them,4 cases had dysfunction of central nervous system (8.3％),2 cases with intra-cerebral hemorrhage (4.2％),and 2 suffered from severe cerebral edema (4.2％).Good recovery was seen in 38 cases (79.2％) evaluated by GOS when discharged from hospital.The follow-up result mRS ＜ 3 was 97.9％.Conclusion Multimodality treatment of BAVM with Onyx embolization and microsurgery should be a good therapeutic strategy.

Objective To assess the clinical efficacy of minimally invasive internal fixation combined with percutaneous kyphoplasty (PKP) in treatment of thoracolumbar burst fractures in the elderly.Methods Twenty-one cases of neurologically intact thoracolumbar burst fractures treated by PKP between January 2007 and December 2008 were included in this study.There were 8 males and 13 females at age of 65-78 years (means,70.6 years).Mean period from injury to operation was (3.7 ± 1.1) days (range,3-7 days).The injured segments included Ti1 in two cases,T12 in six,L1 in eight and L2 in five.Kphosis Cobb' s angle,correction degree of kyphosis angle,correction loss of kyphosis,perioperative indicators,visual analogue scale (VAS) and Oswestry disability index (ODI) were evaluated after operation.Results All the cases were followed up for a period of 26-56 months (mean 34.2 months).Operation averaged 98.7 minutes (range,80-120 minutes) and showed mean blood loss of 32.8 ml (range,30-85 ml).Ambulation started at mean 18.2 hours after operation (range,8-19 hours).VAS averaged (0.9 ± 0.6) points at postoperative one week.Postoperative X-ray films revealed mean 10.4° correction of kyphotic Cobb angle,followed by mean 1.8 °of loss in the follow-up longer than 24 months.According to hyperextension and hyperflexion radiographies,there was no abnormal activity of fixed segments,implant loosening and breakage or adjacent vertebral fractures.Conclusion Minimally invasive internal fixation combined with PKP can relieve pain and restore function in a short time and is thought to be a preferable treatment option for thoracolumbar burst fractures in the elderly.

Objective To investigate the clinical features and treatment strategy of brain arteriovenous malforma-tions(AVM) associated with arterial aneurysms. Methods The clinical manifestation, imaging data, treatment and out-come of the patients with AVM were retrospectively analyzed in 38(10.4%) of these 364 patients. Results Hemorrhage was the most common clinical manifestation (60.5%). The hemorrhage risk was higher in AVM associated with arterial an-eurysms than in single AVM(χ2=5.956,P<0.05). The most common type of associated aneurysms was feeding artery an-eurysm (69.4%). Hemorrhage more frequently occurred within the aneurysm.(χ2=8.869,P<0.05). The bleeding lesions and 43 associated aneurysms of the 37 patients were treated effectively by endovascular treatment and/or craniotomy. Thirty-four patients had excellent or good outcomes, six patients had complications, 3 patients had neurological deficits. Postoperative digital subtraction angiography (DSA) examination showed the complete disappearance of arteriovenous malformation and aneurysm in sixteen cases. Conclusions The AVM associated with aneurysms is common in patients with AVM. AVM associated with aneurysms has a higher risk of hemorrhage than single AVM. The aneurysm within AVM has a higher rate of hemorrhage. The treatment priority should be given to the bleeding lesions and aneurysms.

Objective To compare the Roussouly classification of old thoracolumbar fractures combined with post-traumatic kyphosis with that of normal adults, evaluate the effect of different kyphosis angles on sagittal curvature of the thoracolumbar spine so as to provide a theoretical basis for the clinical status and clinical treatment plan of old thoracolumbar fractures combined with post-traumatic kyphosis.Methods A retrospective case control study was made on 49 cases of old thoracolumbar fractures with post-traumatic kyphosis treated from January 2014 to December 2015 (fracture group).Damaged segments of the spine were T11 in four cases, T12 in 14, L1 in 25 and L2 in six.Another 52 normal adult volunteers were chosen as controls.Whole spine X-ray film of the two groups was taken, and the difference in Roussouly classification of the sagittal spine curvature was compared between the two groups.Patients in fracture group were separated into subgroups depending on the Cobb angle (0°-10°, 10°-20°, 20°-30°, 30°-40°, respectively), and the difference in Roussouly classification was compared among subgroups.Results Roussouly classification in control group was five cases of type 1, 12 tpye 2, 25 type 3 and 10 type 4.Results in fracture group was 14 cases of type 1, 11 type 2, eight type 3 and 16 type 4.There were significant differences in Roussouly types between the two groups (P<0.05).According to Roussouly classification, there were two cases of types 1 and 2 and seven cases of types 3 and 4 in subgroup of Cobb angle between 0°-10°;four cases of types 1 and 2 and 10 cases of types 3 and 4 in subgroup of Cobb angle between 10°-20°;12 cases of types 1 and 2 and four cases of types 3 and 4 in subgroup of Cobb angle between 20°-30°;seven cases of types 1 and 2 and three cases of types 3 and 4 in subgroup of Cobb angle between 30°-40°.There were significant differences in Roussouly types among subgroups (P<0.05).Further, Roussouly types 1 and 2 were significantly increased when the Cobb angle was >20° (P<0.05).Conclusions Post-traumatic kyphosis in old thoracolumbar fractures affects spine sagittal curvature.Patients with sagittal spinal imbalance (Roussouly types 1 and 2) are more with increased Cobb angle.Moreover, Cobb angle >20°may be the reference basis for clinical intervention.