DEK protein is an abundant chromatin protein in metazoans with highly conserved nuclear factor. This protein is a unique member of its family and is preferentially expressed in actively proliferating and malignant cells. Recently, much attention has been paid to the role of DEK protein in the development of various cancers, which was originally discovered in a subset of acute my-elogenous leukemia. Oncogene DEK is overexpressed in several malignancies including hepatocellular carcinoma, glioblastoma, retino-blastoma, bladder cancer, malignant melanoma, and cervical cancer. Oncogene DEK is a chromatin remodeling protein that supports cancer cell proliferation and invasion. In this review, we summarized research advancements in the correlation between DEK protein and oncogenesis.

BACKGROUND:Impact mechanics properties of thoracic vertebra cancellous bone should be understood in treating osteoporosis,bone remodeling,bone reconstruction,as well as fixator selection for thoracic vertebral fracture.Most of previous studies concerning youth and the elderly bodies alone,reports regarding impact of thoracic vertebra cancellous bone mechanical properties are few.OBJECTIVE:To perform impact experiment to the normal people youth and the elderly fresh corpse thoracic vertebra cancellous bone to survey the impact mechanical properties,and to definite whether the impact mechanical properties of thoracic vertebra trabecular bone have difference between youth and the elderly people.METHODS:Experimental samples were from 4 normal fresh corpse,aged 20,25,70 and 75 years,were provided by Department of Anatomy,Norman Bethune Medical University.Spinal column thoracic vertebra T_(3-12) specimen were obtained from corpse within 1 hours and cut into 40 mm×6 mm×6 mm pieces,with 20 test pieces in each group.The impact experiment was performed using energy liberation method at room temperature under 28 ℃.After experiment,the impact energy was displayed automatic on testing machine,and the impact toughness was calculated by mechanical formula,and the morphology of fracture surface was observed.RESULTS AND CONCLUSION:The impact energy and impact toughness of the youth group was obviously greater than that of the elderly group (P＜0.05).Majority of the fracture surfaces were comminuted,minority were transverse or oblique fracture.The macroscopic observation showed that trabecular arranged compact in the thoracic vertebra cancellous bone of the youth group,which was sparse arrangement and presented with senile osteoporosis in the elderly group.It demonstrated that the impact mechanics properties of thoracic vertebra cancellous bone are different between the youth and elderly groups,and osteoporosis changes impact mechanics properties in the elderly people.

BACKGROUND: Superior trunk of brachial plexus nerve is the part where brachial plexus nerve injury occurred easily during the process of delivery.OBJECTIVE: To perform elongation test, stress relaxation and creeping test on superior trunk of brachial plexus nerve of fresh fetal corpses, and to analyze the mechanical characters of elongation and mechanical characters of visco-elasticity.DESIGN: A randomized and controlled experiment, multiple variable analysis.SETTING: Department of Radiology, China-Japan Union Hospital, Jilin University, Department of Engineering Mechanics, Nanling Campus, Jilin niversity.MATERIALS: The specimens were 30 dead and fresh fetuses aged 6.5 to 8 months, including 16 male and 14 female.METHODS: ①After efrosting at ordinary temperature, superior trunk of brachial plexus nerve was taken out, and 100 samples were cut out along the length wise of specimen. 32 samples were used in elongation test, 32 in stress relaxation test and 32 in creeping test and 4 in pre-test. ②Elongation test, stress relaxation test and creeping test were separate and each test was subdivided into 4 groups: male fetus group of 6.5 to 7 months ,male fetus group of over 8 months, female fetus group of 6.5 to 7 months and female etus group of over 8 months, with 8 samples in each group. ③Superior trunk of brachial plexus nerve was performed one-way elongation test ,and destroy load , intensity limit, maximum strain were obtained; Superior trunk of brachial plexus nerve as performed stress relaxation test and creeping test, and data and curve of stress relaxation test and creeping test were obtained. Experimental data were given normalized treatment and normalized stress relaxation function and normalized creeping function and curve were derived. The experimental data were performed regression analysis with one-dimensional linear regression analysis, then regression coefficient was obtained and experimental curve was fitted.MAIN OUTCOME MEASURES: Mechanical characters of elongation and mechanical characters of visco-elasticity of superior trunk of brachial plexus nerve.RESULTS: ①Destroy load, intensity limit and maximum strain of superior trunk of brachial plexus nerve were all less in fetus group of 6.5 to 7 months than in the fetus group of over 8 months (P ＜ 0.05). There was no significant difference of mechanical characters of elongation among brachial plexus nerves between male and female (P ＞ 0.05). ② 7 200 s creeping quantity was larger in female fetus group of over 8 months than in the male fetus group of over 8 months [(10.2±1.1)%, (7.2±1.08)% ,P ＜ 0.05].7 200 s creeping quantity was basically close in female fetus group of 6.5 to 7 months group to male fetus group of 6.5 to 7 months [(16.7± 1.6)%,(15.1±1.2)%,P ＞ 0.05]. ③ 7 200 s stress relaxation quantity was basically similar in male fetus group of over 8 months to female fetus group of over 8 months (P ＞ 0.05). 7 200 s stress relaxation quantity was larger in male fetus group of 6.5 to 7 months than in female fetus group of 6.5 to 7 months (P ＜ 0.05).CONCLUSION: In the process of delivery, at the same external force, only fewer fetuses with poor ability to resist external force present brachial plexus nerve injury. The individual difference of mechanical characters of elongation of superior trunk of brachial plexus nerve might be caused by heredity, dystrophy and other factors. In addition, at the same strain, the creeping quantity is larger in the female group of small month than in the female group of large month, which might be due to that the development of brachial plexus nerve is not mature in the fetus of small months as that in the fetus of large months.

BACKGROUND:The creep characteristics of cancellous bone from necrotic femoral head are important for clinical artificial joint replacement.Therefore,it is necessary to study mechanical properties of cancellous bone at 45°direction.OBJECTIVE:To compare creep properties of normal femoral head and necrotic femoral head at 45°direction based on three-parameter model established creep equation METHODS:A total Of 8 normal and 8 necrotic femoral heads were used.The cancellous bone was harvested at 45° and subjected to creep test on electronic universal testing machine.With simulated temperature field of human body temperature at36.5℃.stress was imposed on the samples by an increase of 5%/s for 7 200 seconds.100 experimental data were collected,and stress relaxation equation was calculated using three-parameter model.RESULTS AND CONCLUSION:The creep curve of the femoral head of normal and necrotic changes was exponential relation.Changes were fast in the first 600 seconds,and strain increased slowly with time,finally entered into balance stage.7 200 s creep of cancellous,bone from necrotic femoral head was less than normal femoral head cancellous bone.Three-parameter model calculation is simple and can well fit the creep of changes in the femoral head.The establishment of such idealized equation quantitatively shows poor visco-elasticity of the necrotic femoral head.

The stress fracture is often resulted from forced march, heel-and-toe walking race, trudge over a longdistance etc. The stress fracture in metatarsal bone is very common. After analysis of bearing-force onmetatarsal bone, the feet are simplified as weight-bearing-cantilever beam structure, while the metatarsalbone as lever units which support the bending cantilever. 16 metatarsal bones were taken from freshcadavers of normal Chinese adults. TYPE 2H cantilever stress teeting machine was used for the experiment.This study analyzes the injury mechanism of stress fracture theoretically, the defines limit of stress fractureof the metatarsal bone, and makes biomechanical analysis for the fracture types. This experiment providesthe data and materials for prevention and diagnosis of stress fracture and the possibility of methods andpaths for stress fracture experiment of the biomaterials.

Objective To evaluate the therapeutic effect and toxicities of low dose Gemcitabine combined with Oxaliplatin in the treatment of advanced or metastatic uroedthelial carcinoma.Methods A total of 42 patients pathologically confirmed advanced or metastatic urothelial carcinoma (23 bladder cancer cases,11 ureteral carcinoma cases,and 8 renal pelvic carcinoma cases) were reviewed.Karnofsky score for each patient before treatment was more than 60.Combined treatment with Gemcitabine and Oxaliplatin regimen was as follows:Gemcitabine 700 mg/m2,iv infusion at day 1,8 and day 15,Oxaliplatin 100 mg/m2,iv infusion at day 2.The regimen was administered for more than 2 cycles (every 4 weeks) and the response rate was evaluated.The regimen was used in palliative chemotherapy and adjuvant chemotherapy,respectively.Results According to WHO evaluation criteria on therapeutic effectiveness,7 patients (16.7％) had complete response,13 patients (30.9％) had partial response,14 cases (33.3％) remained stable status,and 8 cases (19.1％) had progression.The overall response rate was 47.6％.The main side effects included thrombocytopenia,leucopenia,nausea,vomiting and alopecia,which were mild to moderate and disappeared when the chemotherapy was ceased.No chemotherapy related death occurred.Conclusions Combined treatment with low dose Gemcitabine and Oxaliplatin is effective for advanced or metastatic urothelial carcinoma,with mild and tolerable toxicities.

BACKGROUND:Tracheal injury suture and the development of a new tracheal prosthesis all need to understand the tensile mechanical properties of tracheal cartilage.so as to repair and rebuild tracheal function.Previous researches on the biomechanics of artificial trachea are many reported.while the biomechanics of human tracheal cartilage is reported less.OBJECTIVE:To investigate the mechanical properties of tracheal cartilage using one-dimensional tensile test method.METHODS:Two fresh cadaver specimens of normal human trachea.with the informed consents of their families.were involved.The specimens were thaw at room temperature,and then tracheal cartilage specimens were cut using scalpel into 20 samples at the length of 25 mm,width 5 mm,thickness 1.8-2.2 mm.The 20 tracheal cartilage samples were subjected to one-dimensional tensile test with Shimadzu electronic universal testing machine Japan,at the tensile test speed of 5 mm/min.The tensile maximum load,maximum displacement,maximum stress,maximum strain,elastic modulus and stress-strain curve of the specimens were observed.RESULTS AND CONCLUSION:The maximum load of human cadaver tracheal cartilage was(60 946±10.377)N,maximumdisplacementwas(1.973±0.159)mm,maximum stresswas(6.229±1.125)Mpa,maximum strainwas(32.825±2.776)%.Tracheal cartilage stress-strain curves was changed along with the index,the initial low slope of the curye was due to the direction of imposed tension was similar with the arrangement of collagen structure,the steep slope represented the tensile strength of collagen.To describe the tracheal cartilage stress-strain relationship in a one-dimensional tension,15 stress-strain data of the tracheal cartilage experimental data adopted polynomial by the least square fitting method,to obtain stress(δ)-strain(ε)relationship forrnula:σ(ε)=-0.111 3e~5+1.602 1e~4-7.821 6e~3+17.995 1e~2+3.624e.It is indicated that tracheal cartilage has a strong capacity to bear Joad and resist deformation,reflecting their viscoelastic mechanical properties of both flexibility and viscosity,supporting that the mechanical properties of cartilage is positively related to cartilage collagen content.

BACKGROUND:Shear mechanical properties of lumbar trabecular bone should be understood in treating osteoporosis,bone remodeling,bone reconstruction,as well as the choice of fracture fixed equipment.OBJECTIVE:To explore whether the shear mechanical properties of lumbar trabecular bone is different in young and aged normal fresh cadavers.METHODS:Experimental samples were from 4 normal fresh corpse,aged 22,28,70 and 75 years,were provided by Department of Anatomy,Norman Bethune Medical University.Spinal column thoracic vertebra L_2-L_5 specimen were obtained from corpse within 1 hour and cut into 40 min×5 mm×5 mm pieces.The specimen were tested on electronic universal testing machine with speed of 5 mm/min,the shear load,stress,strain and other data would be printed automatically,and the morphology of fracture surface was observed.RESULTS AND CONCLUSION:Majority of the fracture surfaces were comminuted,minority were transverse or oblique fracture.The macroscopic observation showed that trabecular arranged compact in the thoracic vertebra cancellous bone of the youth group,which was sparse arrangement and presented with senile osteoporosis in the aged group.The shear force,shear stress and strain of the youth group was greater than that of the aged group[(37.19±3.25),(28.34±3.42) N;(1.49+0.13),(1.13±0.14) MPa;(1.40±0.50)%,(0.90±0.20)%,P＜0.05].It demonstrated that the impact mechanics properties of thoracic vertebra cancellous bone are different between the youth and aged groups.

BACKGROUND:Thoracic or lumbar spine fracture and dislocation mainly treated by internal/external fixation devices with surgical methods.Fixation methods in treating spine fracture and dislocation is an important subject for scholars.OBJECTIVE:To quantitative analyze the treatment of spinal fracture and dislocation using pedicle screw and plate fixation,and to provide mechanical parameters for clinical application.METHODS:Shimadzu electronic universal testing machine was used to simulate L_1 lumbar fracture and dislocation treated by plate fixation and pedicle screw fixations,specimens were underwent flexion,extension,compression,as well as torsion tests,with speed of 5 mm/min.The torsion test was performed on the torsion machine with speed of 0.05 (°) / s.All the experimental data were analyzed by statistical analysis and paired t test.RESULTS AND CONCLUSION:The results demonstrated that the outcomes of compression test had no significant differences between 2 groups (P>0.05).The left and right torsion angle of the pedicle screw fixation group was smaller than that of the plate fixation group (P<0.05),and the flexion and extension displacements was smaller in the pedicle screw fixation group than in the plate fixation group (P<0.05).It suggested that plate fixation is worse than pedicle screw fixation,while pedicle screw fixation is conductive to bone healing,thus,pedicle screw fixation is a better internal fixation device.

Objective To compare healing effects of surgical incisions using 635 /808 nm dualwavelength semiconductor laser and He-Ne laser irradiation.Methods 168 cases of non-malignant tumor surgery patients were randomly divided into 2 groups:test group including 83 cases which were treated on the surgical incisions by laser irradiation of the semiconductor illumination with low-intensity power; positive control group with 85 cases treated with He-Ne laser.Observation was carried out on incision healing by the clinic manifestations including redness,heat,swelling,pain,exudation,wound open,adverse event and the incision length offset.Results There was no significant difference between experimental group and the control group on incision healing (P＞0.05).Conclusions The treatment efficacy of the dual-wavelength semiconductor laser on surgical incisions healing is similar with that of the He-Ne laser.