Objective To explore the relationship between severe(≥grade 3 ) radiation pneumonitis (RP) and dose-volume histogram (DVH) parameters for non-small cell lung cancer (NSCLC) treated with three-dimensional conformal radiation therapy (3-DCRT). Methods Ninety-four patients with NSCLC treated with 3-DCRT were retrospectively analyzed. Clinical parameters were analyzed. DVH parameters analyzed were V20, V30, V40,mean lung dose (MLD),normal tissue complication probability(NTCP) ,and total dose. Results Age,sex, Karnofsky scored, performance status, forced expiratory volume in 1 second,presence of weight loss, preexisting lung disease, history of thoracic surgery, and history of chemotherapy were not associated with the risk of severe RP(P>0.05). However,in univariate analyses, V20, V30, V40, MID and NTCP were associated with severe RP(P<0.01). In multivariate analysis, MID and V30 were variable associated with severe RP(P<0.01). The severe RP was 0 when MLD < 10 Gy and 21%(8/39) when MLD between 10 Gy and 20 Gy but 35%(7/20) when MLD > 20 Gy,it was 0 when V30 < 25% and 12%(4/33) when V30 between 25% and 35% but 38%(11/29) when V30 >35%. Conclusion MLD and V30 are significant predictive factors for severe RP and they should be limited to ≤20 Gy and ≤ 35% in order to reduce severe RP.

BACKGROUND: Osteoporotic fracture combined with type 2 diabetic mellitus in female patients is often accompanied by dyslipidemia and hyperglycemia. In addition to insulin treatment, statins are often prescribed for combination therapy, but the combined effect of these two drugs on fracture healing has not been reported in such patients. OBJECTIVE; To investigate the effect of lovastatin combined with insulin on the fracture healing of bilateral ovariectomized rats suffering from type 2 diabetic mellitus. METHODS: The study was approved by the Ethical Committee of North China University of Science and Technology. Thirty-two female Sprague-Dawley rats were divided into control, diabetic ovariectomized, insulin and combined groups. A model of type 2 diabetes and osteoporosis fracture was established in all rats except for the control group. At 7 days after the type 2 diabetic model was successfully established by injection of streptozotocin, the rats in the insulin and combined groups received the subcutaneous injection of insulin (2-4 U in the morning, and 4-6 U in the evening) until the end of the experiment. The rats in the combined group were given 20 mg/kg lovastatin via gavage daily, and those in the other two groups were not treated. All rats were sacrificed at 3 weeks after fracture. Radiographic, clinical and histomorphometric detections of the callus were performed. The expression levels of bone morphogenetic protein 2, vascular endothelial growth factor and collagen type II were detected. All above results were used to analyze the fracture healing in each group. RESULTS AND CONCLUSION: (1)The radiographic score, micro-CT index, histologic score and the expression levels of vascular endothelial growth factor and collagen type II in the diabetic ovariectomized group were significantly poorer than those in the control group (P < 0.05). (2) All above indexes in the insulin group were significantly improved compared with the diabetic ovariectomized group (P < 0.05), which promoted the fracture healing of model rats. (3) After combined with lovastatin, although the expression levels of vascular endothelial growth factor and bone morphogenetic protein 2 in the callus were significantly increased (P < 0.05), there was no significant improvement in the radiographic appearance and microstructure of the callus.

OBJECTIVE:To compare the effects of strontium ranelate and PTH(1-34)on bone quality of ovariectomized rats. METHODS:80 SD rats were randomly divided into sham operation group(group A,n=10)and dual ovariectomy(group B,n=70). 3 months after operation,group B were randomly divided into 7 groups,with 10 rats in each group. B0 group were given nor-mal saline [0.9 g/(kg·d)] subcutaneously;B1-B3 groups were given low-dose,medium-dose and high-dose of strontium ranelate [0.45,0.9,1.35 g/(kg·d)] intragastrically;B4-B6 groups were given low-dose,medium-dose and high-dose of PTH(1-34)[30, 60,90 μg/(kg·d),treated for 5 days,rested for 2 days] subcutaneously. Group A was same to group B0 in therapy regimen. All rats were sacrificed 8 weeks later. The contents of P1NP and CTX-1 in serum of rats were determined by ELISA assay;bone densi-ty of 4th lumbar vertebrae was detected by bone densitometer;BV/TV,Tb.Th,Tb.N and Tb.Sp were detected by CT;maximal load and elastic modulus of 5th lumbar vertebrae were measured by compression test. RESULTS:Compared with group A,the se-rum levels of P1NP and CTX-1 in B0-B6 groups increased significantly,while bone density of 4th lumbar vertebrae,maximal load and elastic modulus of 5th lumbar vertebrae decreased significantly in B0-B3 groups(P<0.05);BV/TV level of 4th lumbar verte-brae decreased significantly,while Tb.Sp level increased significantly in B0 group(P<0.05). Compared with B0 group,bone den-sity of 4th lumbar vertebrae,maximal load and elastic modulus of 5th lumbar vertebrae increased significantly in B1-B3 groups (P<0.05);P1NP content,BV/TV,Tb.N level,bone density of 4th lumbar vertebrae,maximal load and elastic modulus of 5th lumbar vertebrae increased significantly in B4-B6 groups,and were higher than in B1-B3 groups(P<0.05). Tb.Sp level of B1-B6 groups decreased significantly and were lower than those of B1-B3 groups(P<0.05). There was no statistical significance in Tb.Th level among 8 groups and CTX-1 content among B0-B6 groups (P>0.05). CONCLUSIONS:PTH(1-34) is better than strontium ranelate in inhibiting bone loss,improving vertebral bone micro-structure and biomechanical properties of ovariectomized rats.

Objective To investigate the preventive effect of Strontium ranelate on stress-absence induced osteoporo?sis in tail-suspended rat. Methods A total of 30 SD rats with average age of 6 month were randomly divided into 3 groups (n=10 in each group):Group A was normal control group while rats in group B and C were subjected to tail suspension test to establish stress absence models. Rats in group C were administered with Strontium ranelate [1 g/(kg·d)]. All rats were sacri?ficed 4 weeks later. Left femurs were harvested for bone mineral density (BMD) test and prepared for undecalcified tissue sec?tion and thereby bone histomorphometry assessment. Bone marrow from right femurs and tibias were cultured and induced to?wards osteogenic-differentiation. The expression levels of osteocalcin in the fourth-passage cultured bone marrow cells and in blood serum were detected separately. Results Rats in group B showed markedly decreased BMD comparing to those in group A and C(P<0.05). Trabecular volume (BV/TV), number (Tb.N) and thickness (Tb.Th) in group B were lower than those in group A and C;erosion percentage (Er.Pm) and osteoclast number (Oc.N) in group B and C were higher than those in group A;comparing to those in group B, bone formation rate (BFR/BV), labeled percentage (L.Pm), were higher in group C, coupled with decreased Er.Pm and Oc.N(P<0.05). mRNA expression levels of OCN in group B and C were higher than those of group A. But its level in plasma were lower in group B than those in group A and C(P<0.05). Conclusion Tail suspension could induce osteosporosis. Strontium ranelate prevent bone loss in stress-absence osteoporosis in rat induced by tail-suspension for 4 weeks, which might be partially through upregulating the expression of OCN, thereby promoting bone formation.

Objective To investigate the effects of lovastatin alone or combined with calcitonin on fracture repair in osteoporotic rats. Methods Forty 4-month-old female SD rats were randomized into 5 groups(8 rats in each group):normal fractured group (A), osteoporotic fractured group (B), lovastatin treatment group(C), calcitonin treatment group (D) and lovastatin combined with calcitonin treatment group. All rats except group A received bilateral ovariectomy. The midshaft femur fracture model was established in all rats 8 weeks after operation. The serum level of procollagen amino-terminal propeptide (PINP) was assessed by ELISA. X-ray and bone mineral density detection was used to observe the fracture healing process. The maximal loading of femoral fractures was analyzed by biomechanical method. Results (1) The serum level of PINP was significantly lower in group A than that of other groups. There was a significantly higher level of PINP in group C and group E than that of group B, and the level of PINP was significantly lower in group D than that of group C. (2) The X-ray showed more progressed fracture healing in group A and group E. The accordingly score indicated that there was a markedly higher score in groups A and group E compared to that of other three groups. (3) There was a highest bone mineral density in the full-length and in the middle of femur bone in group A, followed by group E, group D and group C. The lowest bone mineral density was found in group B. (4) The biomechanical test showed that the maximal loading in femur fracture side was significantly higher in group A than that of other four groups, in which it was higher in group E than that of group B. Conclusion The osteoporosis decreased bone mass and delayed fracture healing process in rat model. The treatment of lovastatin combined with calcitonin showed more positive effect on preventing bone loss and promoting fracture repair than lovastatin alone.

Objective:To analyze the influence of vitamin D 3 supplementation on the clinical efficacy of mesalazine in patients with ulcerative colitis (UC). Methods:From January 2015 to December 2020, patients with mild-to-moderate active UC were retrospectively and continuously enrolled, who accepted mesalazine treatment for at least 12 months at the Second Affiliated Hospital of Wenzhou Medical University. According to simultaneous supplement of vitamin D 3 (125 IU/d), the patients were divided into study group and control group. Demographic and disease characteristics, serum 25-hydroxyvitamin D[25(OH)D] levels and other information were collected through retrieving hospital database. Student′s t-test, Mann-Whitney U test and Chi-square test were applied for comparison of disease characteristics. The changes of modified Mayo scores[ΔMayo] and 25(OH)D[Δ25(OH)D] were compared before and after treatment by paired t-test, Wilcoxon signed rank test and Chi-square test. Multiple linear regression model was used to analyze the independent factors affecting ΔMayo and Δ25(OH)D, and variables with P-values less than 0.20 in the univariate analysis were allowed for further multivariate analysis. Results:A total of 74 UC patients (44 males, 30 females), with median age (range) 39.5 (20-76) years old, were analyzed and respectively assigned into study group ( n=36) and control group ( n=38). In study group, the average level of serum 25(OH)D was significantly increased at month 12 compared with that at baseline [(22.87±7.30) μg/L vs. (18.15±7.48) μg/L, P<0.001]. However, no significant elevation of serum 25(OH)D was found in control group [(19.17±8.49) μg/L vs. (19.82±9.47) μg/L, P=0.466]. Furthermore, there was a significant decrease of modified Mayo score [-3(-4.75, -1.25) vs.-2(-3.25, 0), P=0.034] and a higher clinical remission rate (55.6% vs. 28.9%, P=0.020) at month 12 in study group than those in control group. In addition, according to the baseline level of serum 25(OH)D before mesalazine treatment, 74 UC patients were divided into vitamin D deficiency group ( n=38, serum 25(OH)D<20 μg/L) and non-deficiency group ( n=36, serum 25(OH)D≥20 μg/L). At month 12 in vitamin D deficiency group, patients with vitamin D3 supplementation had a greater decline in modified Mayo score [-4(-5.75, -2) vs.-2(-4, 0), P=0.048] and a higher clinical remission rate (60.0% vs. 22.2%, P=0.019) compared with those without. Conclusions:In patients with mild-to-moderate active UC receiving mesalazine treatment, vitamin D3 supplementation may improve the clinical efficacy, especially in patients with vitamin D deficiency.

Objective:To investigate clinical manifestations and dermoscopic characteristics of lichen planus-like keratosis (LPLK) .Methods:Clinical data were collected from 21 patients with LPLK who visited Shanghai Skin Disease Hospital and underwent both dermoscopic and histopathological examinations from January 2017 to September 2019, and clinical and dermoscopic features were retrospectively analyzed.Results:These patients were aged 64.69 ± 13.29 years, and the ratio of males to females was 1∶2. Skin lesions were located on the face of 18 cases and legs of 3 cases, and were red/violaceous in color in 7 cases, reddish-brown in 5, brown/gray in 8, and brown/reddish in 1. There were 3 types of skin lesions, including plaque-like type in 10 cases, flat pigmented patch type in 6, and flat erythema-like type in 5. As dermoscopy showed, 12 cases were non-pigmented LPLK, and 9 were pigmented LPLK. Pigment granules were found in 13 lesions, and there was no significant difference in the prevalence of pigment granules between pigmented and non-pigmented LPLK ( P=0.07) ; pigment granules were often diffusely distributed (9/13) , and the diffuse distribution pattern was common paticularly in pigmented LPLK (8/9) ; locally distributed pigment granules were found in 4 cases of non-pigmented LPLK. Coarse pigment granules were seen in 10 cases (10/13) , including 8 of pigmented LPLK and 2 of non-pigmented LPLK, and the prevalence rate of coarse pigment granules significantly differed between the pigmented LPLK and non-pigmented LPLK groups ( P=0.002) . Moreover, special distribution patterns of pigment granules included the annular granular pattern (8/13) and peppered pattern (7/13) , and no significant difference was observed in the prevalence of the 2 special distribution patterns between the pigmented LPLK and non-pigmented LPLK groups (both P > 0.05) . Scales were seen in 13 cases (13/21) , and vascular structures in 7 (7/21) , and there was no significant difference in the prevalence of the 2 structures between the pigmented and non-pigmented LPLK groups ( P=0.67, 0.16, respectively) . Conclusions:LPLK mostly occurs on the face, and manifests as solitary red, reddish-brown or brownish-gray plaques or patches, whose surfaces may be covered with scales. The characteristic dermoscopic feature of LPLK is the presence of pigment granules, which are coarse, often diffusely distributed, and commonly observed in pigmented LPLK.