Under the influence of oncogenic signals and abnormal metabolism, the redox status of cancer cells often differs from that of the normal cells, manifesting as elevated generation of reactive oxygen species( ROS) and oxidative stress.Many signaling pathways involved in tumorigenesis can directly or indirectly regulate ROS metabolism.Currently, the biological significance of increased ROS in cancer cells is still somewhat controversial.ROS on the one hand can promote cancer development and drug resistance, and on the other hand can also cause cell injury and even cell death.To maintain cell viability and proliferation, cancer cells usually up-regulate their antioxidant capacity in adaptation to the intrinsic oxidative stress.Such adaptive mechanisms to oxidative stress are highly important in both cancer development and also play a major role in cancer cell response to therapy.Compelling evidences from recent studies have suggested that targeting the redox regulation mechanisms through proper intervention strategies may have significant therapeutic implications in cancer treatment.This article will focus on alterations of redox status in cancer cells, their adaptation to oxidative stress, and the underlying mechanisms.Potential therapeutic strategies based on such biochemical characteristics of cancer cells will also be discussed.

Objective To evaluate the value of dual-phase spiral CT scanning in diagnosis of small pancreatic carcinoma.Methods 21 cases with small pancreatic carcinoma (≤2 cm) underwent plain CT scan and dual-phase eahanced spiral CT including arterial phase(20~25 s after infusion)and pancreatic phase(50~60 s after infusion)with a 100 ml bolus injection of contrast material at 3~6 ml/s.CTattenuation values of tumor and normal pancreas in all scanning phase were obtained.Results The mean CT value of tumor was(42?14) HU(arterial phase)and (48?18) HU(pancreatic phase),the mean CT value of normal pancreas was (105?15) HU(arterial phase)and (86?11) HU(pancreatic phase).The dens difference of tumor-pancreas was significantly on arterial phase (69?15) HU.Conclusion The maximum dens difference of tumor-pancreas can be obtained on arterial phase CT scan,it has advantages in diagnosing pancreatic carcinoma of early period and to judge the resectionability of pancreatic carcinoma.

Objective To compare the effect of thin-sliced enhanced CT scanning and 3D-DSA data sources in the 3 D printing data reconstruction of intracranial arteriovenous malformation (AVM ). Methods Five patients with AVM were selected prospectively,3 were Spetzler-Martin grade II and 2 were grade III. Two of them used 256-slice spiral CT thin slice enhanced scanning. Three used the 3D-DSA rotating imaging,and the DICOM raw data of the examination results were extracted. Digital processing was performed by using the Mimics software,and the 3 D printing was performed according to the ratio of 1∶1 obtaining the solid model and the effects were compared. Results Using the data source 3 D printing of 256 slice spiral CT thin-slice enhanced scan could obtained skull and blood vessel image information and could reveal the smallest diameter of 0. 9 mm vessel,however,the fine branch structures of the vessel were difficult to distinguish. The 3D printing based on 3D-DSA data,although the digital subtraction did not have the skull data information,the vascular branches showed more abundant. It could reveal the smallest diameter of 0. 9 mm vessel. Conclusions Using the CT thin-slice enhanced scan or 3D-DSA data source can obtain reconstruction images of AVM nidus,and 3D-DSA shows that the better effect for spatial structure of AVM nidus. It is helpful to the design of preoperative treatment scheme and the development of corresponding auxiliary tools.

Objective To study the imaging manifestations and clinical significance of simple cochlear nerve canal(CNC)stenosis. Methods The HRCT findings of 14 patients(1 7 ears)with simple CNC stenosis diagnosed sensorineural hearing loss(SNHL)were retrospectively analyzed.The width of CNC and internal auditory canal was measured and compared with the normal ears,the data were statisti-cally analyzed by SPSS1 6.0.Thin-sliced MRI of internal auditory canal (axial and oblique sagittal position)was performed in 8 cases. Results HRCT displayed obvious CNC stenosis in all 14 patients(1 7 ears),2 ears with cochlear nerve canal atresia.Width of CNC and internal auditory canal was (0.5±0.3)mm and (4.6±1.0)mm,it was (2.1±0.2)mm and (5.1 ±1.3)mm in normal ears (1 1 ears),the width of CNC was of significant difference between normal ears and ears with SNHL,and there was no statistical sig-nificant difference in width of internal auditory canal.12 ears(from 1 7 ears with simple CNC stenosis)were lacking of fissure in the cribriform area,1 1 ears(normal ear)were existence of fissure in the cribriform area;cochlear nerves were not shown in 8 patients with MRI examination.Conclusion CNC stenosis can be isolated from internal auditory canal stenosis,MRI could display cochlear nerve dysplasia(CND).

Objective To investigate the relationship between pelvic asymmetry and Crowe classification of unilateral developmental dysplasia of the hip in adults. Methods According to the inclusion criteria, 100 cases of unilateral DDH in adults were collected, including 78 females and 22 males, with an average age of 56.3 years old (range, 21-79 years). In terms of Crowe classification, there were 30 cases of Crowe typeⅠ, 24 cases of Crowe typeⅡ, 23 cases of Crowe typeⅢ, and 23 cases of CroweⅣ. The normal?side and affected?side pelvic vertical height (the distance from the highest point of the ischial tuberosity to the iliac crest peak) were measured via the radiogram of anteroposterior pelvis. Furthermore, we compared the affected?side pelvic vertical height with the normal?side and analyzed the relationship between Crowe classification and the difference in pelvic verti?cal height. Results The average pelvic vertical height was 23.38±1.46 cm in the normal?side and 22.41±1.38 cm in the affected?side. The average D?value of pelvic vertical height between two sides is 0.98 ± 0.76 cm. From Crowe typeⅠto Ⅳ, the average heights of the normal?side were 22.89±1.09 cm, 23.23±2.07 cm, 23.75±1.16 cm, 23.79±1.22 cm, while those of the affected?side were 22.70 ± 0.98 cm, 22.41 ± 1.98 cm, 22.47 ± 1.12 cm and 21.92 ± 1.32 cm. The average D?values in each group were 0.19 ± 0.37 cm, 0.82±0.43 cm, 1.28±0.32 cm, 1.87±0.59 cm. The differences between the normal?side and the affected?side in each type were statistically significant. The average D?value increased significantly with Crowe type increased, and there was a positive correla?tion between the D?value of bilateral pelvic vertical height and the degree of hip dislocation. Conclusion The pelvic asymmetry does exist in adult patients with unilateral developmental dysplasia of the hip. Moreover, the asymmetry has positive correlation with the degree of hip dislocation.

Objective:To provide a basis for its diagnosis and treatment for clinicians by analyzing the clinical manifestations, imaging features and surgical efficacy of primary intraspinal paraganglioma.Methods:The clinical data of 6 patients with intraspinal paraganglioma from April 2014 to January 2021 in Xiangyang Central Hospital were retrospectively analyzed, and all patients were treated with microsurgery via a posterior median approach.Results:All 6 patients achieved total tumor resection, and the postoperative pathological diagnosis was paraganglioma. Among them, 1 patient′s tumor located inside and outside the cervical spinal canal without destruction of the vertebral body; 1 patient′s tumor located lumbosacral canal with destruction of the vertebral body; the others 4 patients′ tumor located within the lumbar spinal canal. The patients were followed up for 12 to 120 months after surgery, with a median follow-up time of 61.5 months. MRI examination was performed at the last follow-up, and no recurrence was observed. The patients underwent MRI examination at the last follow-up, and none of the patients recurred.Conclusions:The intraspinal paraganglioma is a rare tumor, and nonfunctional benign tumors are predominant. Its clinical and imaging manifestations lack specificity and are often difficult to diagnose before surgery. Surgical resection, especially complete resection, has a better prognosis, and the effectiveness of adjuvant therapy is uncertain.

Objective To analyze the clinical efficacy and safety of tegafur combined with oxaliplatin and gemcitabine combined with cisplatin in the treatment of advanced triple negative breast cancer.Methods Seventy-eight female patients with metastatic triple negative breast cancer who has afailed treatment with anthracycline/taxanes from January 1,2012 to December 31,2015 in PLA 309 Hospital were randomly divided into SOX group (38 cases) and GP group (40 cases) by computer generated random numbers.Results The objective response rates of SOX group and GP group were 31.5％ (12/38) and 32.5％ (13/40),and the disease control rates were 65.8％ (25/38) and 70.0％ (28/40),respectively.There was no significant difference between the two groups (P value was 1.000 and 0.809).The median progression-free survival time of GP group and SOX group was 6.6 and 5.5 months respectively,and there was a significant difference between the two groups (P=0.044).Adverse reactions in both groups included bone marrow suppression,gastrointestinal reactions and so on.The incidence rate of digestive tract reaction was 23.7％ (9/38) in SOX group and 27.5％ (11/40) in GP group.There was no significant difference between the two groups (P=0.699).The incidence rate of bone marrow suppression was 28.9％ (11/38) and 30.0％ (12/40),respectively.There was no significant difference between the two groups (P =0.920).Conclusion Tegafur combined with oxaliplatin and gemcitabine combined with cisplatin are effective drugs for the treatment of metastatic triple negative breast cancer,and the adverse reactions are tolerable.

The number of dental schools increased from 55 in 2000 to 66 in 2019 in the United States. The number of public, private, and private-state-related dental schools were 40, 22 and 4, respectively. A majority of them were located in most developed areas, such as western, eastern, and southern regions of the country. In the same period, the number of freshman enrollees rose from 4 234 to 6 231 while the average of enrollees kept under 100. On the basis of learning relevant experiences of the United States, it might be necessary for China to expand the overall scale of stomatology education in order to address the shortage of dentists, take measures to increase the number of stomatology schools and improve their distribution, and control the number of enrollees per school to enhance the quality of education.

Objective To explore the electrocardiogram (ECG) characteristics and prognoses of patients with severe acute spontaneous subarachnoid hemorrhage (SAH) complicated by cerebrocardiac syndrome (CCS).Methods The ECG characteristics and clinical data of 80 patients with severe SAH admitted to our hospital from January 2012 to December 2015 were retrospectively analyzed.The myocardial enzymes,serum troponin T and ECG changes in patients of Hunt-Hess grading Ⅳ and Ⅴ were compared.Results ECG abnormalities at the first time were noted in 76 patients,accounting for 95％.Wave changes (more than two kinds) were noted in 63 patients.ST-T changes were noted in 68 patients,T wave changes in 45,QT interval prolongation in 30,cardiac arrhythmia in 26,conduction block in 11,and abnormal Q wave in 9.The occurrence rates of Q-T interval prolongation,cardiac arrhythmia,conduction block,abnormal Q wave and Glasgow outcome scale (GOS) scores between patients of Hunt-Hess grading Ⅳ and Ⅴ were significantly different (P＜0.05).The myocardial enzyme levels were normal and serum troponin T level slightly increased in patients of Hunt-Hess grading Ⅴ within 2 h of admission.Conclusion ST and T waves changes are the common electrocardiogram manifestations of acute severe SAH patients with CCS;CCS is the important prognostic factors of acute severe SAH patients.

Objective To investigate the efficacy of calf self weight traction reduction combined with locking plate fixation for the treatment of intertrochanteric fractures in the elderly.Methods A retrospective case series study was conducted on the clinical records of 174 elderly patients with the modified Evans Ⅰ-Ⅲ types of fresh intertrochanteric fractures treated with locking plate from January 2012 to December 2015.According to treatment method,the patients were assigned to traction bed reduction with locking plate fixation (Group A,62 patients) and calf self weight traction reduction with locking plate fixation (Group B,112 patients).Group A comprised 32 males and 30 females,with age range of 65-91 years [(72.47 ± 6.35) years].Group B comprised 68 males and 44 females,with age range of 65-95 years [(73.23 ± 6.05) years].The time of reduction,operation time,incision length,intraoperative blood loss,frequency of fluoroscopy,postoperative drainage volume,hospital stay,postoperative weightbearing standing time or walking time (ambulation time),surgical complications,and fracture healing were recorded.Harris and modified Barthel index score in Chinese (MBI-C) were used to evaluate the functional recovery of hip joint.Results All patients were followed up for 5-61 months (mean,15 months),and noted with fracture healing.The time of reduction in Group A was (13.27 ± 3.03) minutes,longer than that in Group B (0 minute) (P ＜0.05).The operation time in Group A was (63.63 ± 13.90)minutes,longer than that in Group B [(59.62 ± 8.38) minutes] (P ＜ 0.05).Fluoroscopy in Group A was (5.35 ± 2.36) times,more than (4.28 ± 3.11) times in Group B (P ＜ 0.05).There were no significant differences in the incision length,intraoperative blood loss,postoperative drainage volume,ambulation time,fracture healing time,Harris score,and MBI-C index between the two groups (P ＞0.05).There were no significant differences in the postoperative complications such as deep venous thrombosis,pulmonary infection,incisional infection,urinary tract infection,delirium,bed sores,cardiac insufficiency,electrolyte disturbance,and postoperative plate rupture between the two groups (P＞0.05).The incidence of deep vein thrombosis was 9.7％ (6/62) in Group A,and 4.5％ (5/112) in Group B (P ＞0.05).No screw fracture,nail and plate combination failure,bone nonunion,or screw cut out of the femoral head were observed in both groups.Conclusions For the modified Evans Ⅰ-Ⅲ types of intertrochanteric fractures,both traction bed reduction and calf weight reduction with locking plate have equivalent efficacy.However,the latter method has advantages of shorter reduction and operation time and less intraoperative X-ray exposure,and hence is worthy of clinical application.