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To accurately launch laser, a fast-steering mirror (FSM) with flexure hinge is designed. First, actuators, angle sensors and flexure hinge were designed or selected respectively according to requirements of vehicle track-launch system. Then, the servo control system with two closed loops was projected after fine manufacturing and assembling. Finally, the pointing precisions of FSM on the static and vibrancy platforms were tested. The results show that the designed FSM with pointing error range on the static platform is less than 0.9″, and less than 44.5″ on the vibrancy shaker, which can meet the requirements of vehicle track-launch system application.

Background The clinical significance of left inferior phrenic vein (IPV) during left retroperitoneal laparoscopic adrenalectomy (RLA) for adrenal tumors is unclear. We aimed to investigate the surgical feasibility and value of IPV as a landmark during RLA. Methods Between September 2016 and November 2018, 92 consecutive left RLAs were performed by the same surgeon. All the operations were performed through the approach of three relative avascular planes༎Then we searched for IPV between superior margin of renal artery and anterior aspect of psoas major muscle. The left IPV was used as an anatomical landmark to identify and ligate the central adrenal vein (CAV). Results All 92 operations were performed successfully with one conversion to open surgery. We identified the CAV following left IPV in all cases. The left IPV drained into the CAV in 100% of cases, and variant venous anatomy (2 CAVs) was encountered in 2 pheochromocytoma cases (2.17%). Peritoneum perforation occurred in one case in operation (1.09%). Postoperative complications (fever) occurred in 3 patients (3.26%). The mean operative time was 75.82 ± 21.55 minutes༎The average postoperative hospital stay was 3.57 ± 0.76 days༎Pathological examination revealed: cortical adenoma in 72 cases (78.26%), adrenal cyst in 11 cases (11.96%), pheochromocytoma in 6 cases (6.52%), cortical hyperplasia in 1 case (1.09%), medullary hyperplasia in 1 case (1.09%), and hemangioma in 1 case (1.09%). Conclusions Using left IPV as a landmark to search for and handle CAV has important clinical significance in left RLA.

Objective To investigate the association between smoking and different prostate cancer (PCa) pathological subtypes incidence in Chinese men. Patients and methods We prospectively included 1795 patients who underwent prostate biopsies in one tertiary center between March 2013 and April 2016. Clinical data and biopsy outcomes were collected. Logistic regression was used to evaluate the association between cigarette smoking and PCa incidence. Results A total of 737 men, 480 men and 58 men were diagnosed with PCa, high-grade PCa (HGPCa, grade group ≥ 4 as accepted by the 2014 ISUP) and intraductal carcinoma of the prostate (IDC-P), respectively. Current smokers had a significantly higher risk of HGPCa than never smokers (OR = 1.89, 95%CI: 1.44-2.48). No such association was observed for low-grade disease and cigarette smoking (OR = 0.84, 95%CI: 0.61-1.16). In a sub-analysis, men who had smoked longer than 30 years had a higher risk of HGPCa, compared with men who had smoked fewer than 30 years (OR = 1.50, 95%CI: 1.09-2.06). Current smokers were more likely to develop IDC-P than never smokers (OR = 2.29, 95%CI: 1.14-4.59). Conclusion Among men in this Chinese biopsy cohort, current smoking was associated with highly malignant PCa incidence, such as HGPCa and IDC-P. The duration of smoking may be associated with HGPCa.

To evaluate the correlation between the level of adipocytokines expression in periprostatic adipose tissue and the prostate cancer aggressiveness.The periprostatic adipose tissues were collected from 30 patients who underwent radical retropubic prostatectomy. The subcutaneous adipose, periprostatic adipose tissues and prostate cancer tissue from the same patient were collected from 10 patients for match research. The expression level of IL-6, Leptin and Adiponectin was detected by immunohistochemistry and by Real-time quantitative PCR in periprostatic adipose tissues.There were differences in the positive rates of IL-6, Leptin and Adiponectin expression in the periprostate adipose between prostate cancer and control (P0.001, P=0.032, 0.003). Nothing but the "IL-6 expression intensity" was seen in difference with the aggressiveness of prostate cancer (P=0.001), and was relevant with the prostate cancer aggressiveness (rs=0.668, P0.001); The mRNA expression of IL-6 in periprostatic adipose tissues of prostate cancer was higher than that of control (P=0.049), and the mRNA expression of Adiponectin was lower (P0.0001); IL-6 mRNA expression in periprostate adipose tissue and prostate cancer tissue were higher than that in subcutaneous adipose (P0.001, P=0.001); IL-6 mRNA expression in periprostate adipose was correlated with that in prostate cancer tissue (r=0.663, p=0.036); Adiponectin mRNA expression in prostate cancer tissue was lower than that in periprostate adipose (P=0.006), and Adiponectin mRNA expression in periprostate adipose was correlated with that in prostate cancer tissue (r=0.707, p=0.022).IL-6, Leptin and Adiponectin were expressed in the periprostatic adipose tissues, which constitute the microenvironment of prostate cancer aggressiveness. There might be intimate relationship between periprostate adipose and prostate cancer tissue.

The [-2]proPSA (p2PSA) and its derivatives, the p2PSA-to-free PSA ratio (%p2PSA), and the Prostate Health Index (PHI) have greatly improved discrimination between men with and without prostate cancer (PCa) in prostate biopsies. However, little is known about their performance in cases where a digital rectal examination (DRE) and transrectal ultrasonography (TRUS) are negative. A prospective cohort of 261 consecutive patients in China with negative DRE and TRUS were recruited and underwent prostate biopsies. A serum sample had collected before the biopsy was used to measure various PSA derivatives, including total prostate-specific antigen (tPSA), free PSA, and p2PSA. For each patient, the free-to-total PSA ratio (%fPSA), PSA density (PSAD), p2PSA-to-free PSA ratio (%p2PSA), and PHI were calculated. Discriminative performance was assessed using the area under the receiver operating characteristic curve (AUC) and the biopsy rate at 91% sensitivity. The AUC scores within the entire cohort with respect to age, tPSA, %fPSA, PSAD, p2PSA, %p2PSA, and PHI were 0.598, 0.751, 0.646, 0.789, 0.814, 0.808, and 0.853, respectively. PHI was the best predictor of prostate biopsy results, especially in patients with a tPSA of 10.1-20 ng ml −1 . Compared with other markers, at a sensitivity of 91%, PHI was the most useful for determining which men did not need to undergo biopsy, thereby avoiding unnecessary procedures. The use of PHI could improve the accuracy of PCa detection by predicting prostate biopsy outcomes among men with a negative DRE and TRUS in China.

The neutrophil-to-lymphocyte ratio (NLR) is associated with clinical outcomes of various cancers. This study aimed to evaluate whether pretreatment NLR can be used as a prognostic factor in patients with metastatic renal cell carcinoma (mRCC) receiving targeted therapy. In this single-center retrospective study, the Kaplan–Meier method was used to estimate progression-free survival (PFS) and overall survival (OS) of 373 mRCC patients receiving targeted therapy. The survival outcomes of patients with high (≥2.2) and low (

Although pretreatment neutrophil–lymphocyte ratio (NLR), lymphocyte–monocyte ratio (LMR), and platelet–lymphocyte ratio (PLR) are reportedly associated with clinical outcomes of many cancers, their roles in patients with bladder cancer (BCa) who undergo radical cystectomy (RC) have not been widely investigated. We analyzed relationships between preoperative NLR, LMR, PLR, and overall survival (OS) in 124 BCa patients undergoing RC. OS curves were drawn using the Kaplan–Meier method and evaluated using the log-rank test. Relationships between OS and potential confounding variables were determined using Cox’s proportional hazard regression model. Decreased LMR was associated with shorter OS (P = 0.012); OS in the low PLR group was significantly longer than that in the high PLR group (P = 0.029), and NLR was not significantly associated with oncological outcomes. However, after adjusting for confounding variables, patients in the high-LMR group indicated >30 % decreased mortality than the low-LMR group (hazard ratio 0.674; 95 % confidence interval 0.412–0.890; P = 0.003), and PLR was not an independent predictor of OS. Our results show that preoperative LMR is a better prognostic factor in BCa patients undergoing RC, compared with NLR and PLR.

This study aimed to evaluate the role of serum lipid profiles as novel biomarkers in predicting pathological characteristics of prostate cancer (PCa). We retrospectively analyzed 322 consecutive patients with clinically localized PCa receiving radical prostatectomy (RP) and extended pelvic lymphadenectomy. Unconditional logistic regression was used to estimate the prostatectomy Gleason score (pGS), pathological stage and lymph node involvement (LNI) in RP specimens. Preoperative prostate-specific antigen (PSA) levels, biopsy GS (bGS), and preoperative tumor, node, metastasis staging were used as basic variables to predict postoperative pathological characteristics. Preoperative serum lipid profiles were introduced as potential predictors. A receiver operating characteristic (ROC) curve was used to determine predictive efficacy. Significant differences in pathological characteristics were observed among patients with normal and abnormal total cholesterol (TC), triglyceride (TG), and low-density lipoprotein (LDL) levels, with the exception of pGS in the TG group. Multivariable regression analysis revealed that the odds ratio for high levels of TC for LNI compared with normal TC levels was 6.386 (95% confidence interval [CI] 1.510-27.010), 3.270 (95% CI: 1.470-7.278) for high levels of TG for pT3-4 disease, and 2.670 (95% CI: 1.134-6.287) for high levels of LDL for pGS. The area under the ROC curve of the models with dyslipidemia was larger than that in models without dyslipidemia, in predicting pathological characteristics. Abnormal TC, TG, and LDL levels are significantly associated with postoperative pathological status in PCa patients. Together with preoperative PSA levels, bGS, and clinical stage, dyslipidemia is more accurate in predicting pathological characteristics.

// Gui-Ming Zhang 1, 2 , Fang-Ning Wan 1, 2 , Xiao-Jian Qin 1 , Da-Long Cao 1 , Hai-Liang Zhang 1 , Yao Zhu 1 , Bo Dai 1 , Guo-Hai Shi 1 , Ding-Wei Ye 1 1 Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, China 2 Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China Correspondence to: Guo-Hai Shi, e-mail: guohaishi@126.com Ding-Wei Ye, e-mail: yedingwei1963@126.com Keywords: TREK-1, prostate cancer, biochemical recurrence, cell proliferation, cell cycle Received: March 05, 2015 Accepted: April 13, 2015 Published: April 21, 2015 ABSTRACT Background: TREK-1 channels belong to the two-pore domain potassium channel superfamily and play an important role in central nervous system diseases. However, few studies have examined their role in carcinogenesis. Methods: In this study, we assessed the expression of TREK-1 in 100 prostate cancer (PCa) tissues using immunohistochemistry and further analyzed its clinicopathological significance. Next, cell proliferation and cell cycle analysis were carried out on human PCa PC-3 cell lines where TREK-1 was stably knockdown. Results: We found that compared with normal prostate tissues, PCa tissues showed overexpressed TREK-1 levels and TREK-1 levels were positively associated with Gleason score and T staging. High level of TREK-1 expression was related to shorter castration resistance free survival (CRFS). Furthermore, knockdown of TREK-1 significantly inhibited PCa cell proliferation in vitro and in vivo , and induced a G1/S cell cycle arrest. Conclusion: Our results suggest that TREK-1 might be a biomarker in CRFS judgment of PCa, as well as a potential therapeutic target.

The global incidence of metabolic syndrome (MetS) is dramatically increasing. Considerable interest has been devoted to the relationship between MetS and prostate cancer (PCa) risk. However, few studies have examined the association between MetS and PCa progression. This retrospective study consisted of 1016 patients with PCa who received radical prostatectomy. The association between MetS and pathological features was evaluated using logistic regression analysis. Compared with patients without MetS, those with MetS indicated an increased risk of prostatectomy Gleason score (GS) ≥8 (odds ratio [OR] =1.670, 95% confidence interval (CI) 1.096–2.545, P= 0.017), and a 1.5-fold increased risk of pT3–4 disease (OR = 1.583, 95% CI 1.106–2.266, P= 0.012). The presence of MetS was an independent predictor of lymph node involvement (OR = 1.751, 95% CI 1.038–2.955, P= 0.036). Furthermore, as the number of MetS components accumulated, the risk of a GS ≥ 8 increased. The present study indicates a significant association between MetS and advanced PCa. The results need to be evaluated in large-scale prospective cohorts.

Purpose. To investigate the association between ABO blood types and clinicopathological characteristics in patients with prostate cancer (PC). Methods. A total of 237 pathologically diagnosed PC patients were enrolled. All patients were classified as low–middle or high-risk group. The correlation of ABO blood types with high-risk PC was determined by univariate and multivariate regression analysis. Results. Data indicated 144 (85.7%) patients were stratified as high risk in the non-O group, while 50 (72.5%) patients in the O group (p=0.025). However, there was no significant difference regarding PSA, Gleason score, stage, or metastasis between O and non-O group (p>0.05). Univariate logistic regression analyses revealed PSA, Gleason score, and blood type non-O were all correlated with high-risk PC (OR = 1.139, p<0.001; OR = 9.465, p<0.001; OR = 2.280, p=0.018, resp.). In the stepwise multivariate regression analysis, the association between blood type non-O and high-risk PC remained significant (OR = 33.066, 95% CI 2.391–457.323, and p=0.009) after adjusting for confounding factors as well as PSA and Gleason score. Conclusion. The present study firstly demonstrated that non-O blood type was at higher risk of aggressive PC compared with O type, suggesting that PC patients with non-O blood type should receive more attention in clinical practice.

To investigate whether waist-hip ratio (WHR) is a better predictor of prostate cancer (PCa) incidence than body mass index (BMI) in Chinese men. Of consecutive patients who underwent prostate biopsies in one tertiary center between 2013 and 2015, we examined data on 1018 with PSA ≤20 ng/ml. Clinical data and biopsy outcomes were collected. Logistic regression was used to evaluate the associations between BMI, WHR and PCa incidence. Area under the ROC (AUC) was used to evaluate the accuracy of different prognostic models. A total of 255 men and 103 men were diagnosed with PCa and high grade PCa (HGPCa, Gleason score ≥8). WHR was an independent risk factor for both PCa (OR = 1.07 95%Cl 1.03–1.11) and HGPCa (OR = 1.14 95%Cl 1.09–1.19) detection, while BMI had no relationship with either PCa or HGPCa detection. Adding WHR to a multivariable model increased the AUC for detecting HGPCa from 0.66 (95%Cl 0.60–0.72) to 0.71 (95%Cl 0.65–0.76). In this Chinese cohort, WHR was significantly predictive of PCa and HGPCa. Adding WHR to a multivariable model increased the diagnostic accuracy for detecting HGPCa. If confirmed, including WHR measurement may improve PCa and HGPCa detection.

This paper simulates the practical engineering, using plexiglass to make a three-span continuous wide curved box girder model by the geometry scale ratio 1:30. With the model load test, measured the strain and deflection of the control cross-sections, got the distribution about the stress and deflection of the wide curved continuous box girder; And we proposed the “uniformity coefficient” to express the uneven force of the curved bridge. Compared the finite element analysis results and experimental data, the results show both are in good agreement.

Objective To examine the prevalence of dyslipidaemia in patients with renal cell carcinoma (RCC) in a Chinese population. Patients and Methods In all, 550 histologically confirmed RCC cases and 570 controls, matched for age and sex were included. Total cholesterol, triglyceride, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) were assessed before treatment using standard techniques. The lipid profiles were defined as ‘normal’, ‘borderline high’, ‘high’ and ‘low’ according to Chinese Guidelines on Adult Dyslipidaemia. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated using unconditional logistic regression in both unadjusted and adjusted models. Results Abnormal LDL elevation was common in RCC cases compared with controls (P < 0.001). Results for total cholesterol, triglyceride and HDL levels between groups were insignificant. The OR for RCC for high levels of LDL (≥160 mg/dL) compared with those with a normal LDL profile was 4.675 (95% CI 1.900–11.500). After adjustment for age, gender, body mass index, smoking status, hypertension, diabetes, total cholesterol and triglyceride, the coexistence of high levels of LDL and RCC was large and statistically significant (OR 8.955, 95% CI 3.371–23.786). There was a significant coexistence of RCC for participants with high LDL levels when subgroups of cases with clear cell subtypes and advanced T stages were compared with controls. Conclusion Abnormal LDL elevation was prevalent in Chinese patients with RCC. The results remain to be evaluated in prospective cohorts.

Seismic displacement design method and allowable values of story drift are compared between Chinese, American, European and Japanese seismic design codes. An engineering example's seismic displacement is calculated in the methods given by the four codes, and story drift are compared. Researches show that allowable story drift of Chinese code under rare earthquake action is approximately close to that of American with a 10% probability of exceedance in 50 years, and allowable story drift of Japanese code is more rigorous than other three codes. For three-story three-span reinforced concrete frame structure, in the condition of same intensity, displacement of Chinese under the earthquake action with 2~3% exceeding probability of 50-year is greater than that of American and European with 10% exceeding probability of 50-year. However, intensity plays no role in Japan's displacement calculation, and the calculation result of displacement of Japanese code is less than other three codes.

Free Trade Area (FTA) reached and validated between ASEAN and China has promoted plant and plant products trade dramatically between Thailand and China since 2000. As the agricultural products trade has kept increased rapidly, the pests management and quarantine become serious and challenging to these two countries in terms of ecological security and biosafety. This paper analyzed the situation of plant and plant products trade between Thailand and China from 2003 to 2012, including the kinds and amounts of plant and plant production, epidemic situation analysis which carried by import and export plant and plant products. There are over 400 kinds of plant and plant products which were trade between Thailand and China, and over 1000 genera (species) pests were intercepted including 79 genera (species) quarantine pests. In this paper, the bilateral arrangement related to plant quarantine was also analyzed. The current issues and problems of quarantine pests research, management and quarantine are articulated and suggestions how to improve or upgrade related researches and quarantine level were proposed in this paper.

Supplemental Digital Content is available in the text, Clinically localized prostate cancer is curative. Nevertheless many patients suffered from biochemical recurrence (BCR) after radical prostatectomy (RP). Mounting evidence suggest that estrogen and xenobiotic carcinogens play an essential role in progression of prostate cancervia oxidative estrogen metabolism. CYP1B1 is an enzyme involved in the hydroxylation of estrogens, a reaction of key relevance in estrogen metabolism. Given the role of CYP1B1 in the oxidative metabolism of endogenous/exogenous estrogen and compounds, CYP1B1 polymorphisms have the potential to modify its expression and subsequently lead to progression. We hypothesize that genetic variants of the CYP1B1 gene may influence clinical outcome in clinically localized prostate cancer patients. In this cohort study, we genotyped 9 tagging single nucleotide polymorphisms (SNPs) from the CYP1B1 gene in 312 patients treated with RP. For replication, these SNPs were genotyped in an independent cohort of 426 patients. The expression level of CYP1B1 in the adjacent normal prostate tissues was quantified by reverse transcription and real-time polymerase chain reaction. Kaplan–Meier analysis and Cox proportional hazard models were utilized to identify SNPs that correlated with BCR. CYP1B1 rs1056836 was significantly associated with BCR (hazard ratio [HR]: 0.69; 95% confidence interval [CI]: 0.40–0.89, P = 0.002) and relative CYP1B1 mRNA expression. Our findings suggest inherited genetic variation in the CYP1B1 gene may contribute to variable clinical outcomes for patients with clinically localized prostate cancer.

To examine whether the predictive performance of prostate-specific antigen (PSA) and PSA-related markers for prostate cancer (PCa) is modified by body mass index (BMI). Patients with a PSA 2–10 ng/mL who underwent multicore prostate biopsies were recruited from three tertiary centers. Serum markers measured included total PSA (tPSA), free-to-total PSA (f/tPSA), p2PSA, percentage of p2PSA (%p2PSA) and prostate health index (PHI). The association between serum markers and PCa risk was assessed by logistic regression. Predictive performance for each marker was quantified using the area under the receiver operator curves (AUC). Among 516 men, 18.2% had PCa at biopsy. For all tested markers, their predictive value on PCa risk was lower in obese patients compared to normal weight patients. We found statistically significant interactions between BMI and tPSA (P = 0.0026) and p2PSA (P = 0.038). PHI achieved an AUC of 0.872 in normal weight patients and 0.745 in obese patients, which outperformed the other predictors regardless of BMI category. In conclusion, PHI achieved the best predictive performance for detecting PCa and was not influenced by BMI.

Herein, we aimed to examine whether the association of body mass index (BMI) with prostate cancer (PCa) at biopsy differs according to genetic susceptibility. In a multicenter prospective cohort including 1120 men undergoing diagnostic prostate biopsy in China, we evaluated the interaction between BMI and genetic risk score (GRS) comprising 24 PCa-associated single nucleotide polymorphisms (SNPs), as well as a GRS consisting of 7 SNPs derived from an East-Asian population. The genetic risk was defined as low, intermediate, or high when GRS fell in the first, second, and third tertiles, respectively. We observed a significant interaction between BMI and PCa GRS (Pinteraction = 0.047), suggesting that the predictive value of BMI on PCa was strongly modified by genetic susceptibility. In men with high genetic risk, BMI was an independent predictor of PCa (odds ratio [OR] = 1.167, P = 0.008) after adjusting for conventional risk factors. The relationship between BMI and PCa risk diminished (P = 0.990) in men with low genetic risk. The interaction was more pronounced with the East-Asian GRS (Pinteraction = 0.032), suggesting that the overall GRS interaction most likely occurs through genetic susceptibility in the East-Asian population. Our results suggest that the predictive effect of BMI on the PCa risk is strongly modified by individual genetic susceptibility. The association is more positive among men with high genetic risk for PCa.

To develop and externally validate a prostate health index (PHI)-based nomogram for predicting the presence of prostate cancer (PCa) at biopsy in Chinese men with prostate-specific antigen 4–10 ng/mL and normal digital rectal examination (DRE). 347 men were recruited from two hospitals between 2012 and 2014 to develop a PHI-based nomogram to predict PCa. To validate these results, we used a separate cohort of 230 men recruited at another center between 2008 and 2013. Receiver operator curves (ROC) were used to assess the ability to predict PCa. A nomogram was derived from the multivariable logistic regression model and its accuracy was assessed by the area under the ROC (AUC). PHI achieved the highest AUC of 0.839 in the development cohort compared to the other predictors (p

A kind of fluid density sensor based on MEMS (Micro-Electro-Mechanical-System) technology is introduced with trapezoidal cantilever structure. The rectangular cantilever and trapezoidal cantilever, based on the same parameters, are analyzed. The simulation results show that the sensitivity of trapezoidal cantilever is higher than that of rectangular cantilever. Four different sizes of trapezoidal cantilever are analyzed by modal and harmonic simulation with ANSYS Software, the optimum solution will be obtained from simulation results.

The pretreatment neutrophil-to-lymphocyte ratio (NLR) is reportedly associated with the clinical outcomes of many cancers. However, it has not been widely investigated whether the pretreatment NLR is associated with the pathological characteristics of prostate cancer (PCa) and biochemical re

Supplemental Digital Content is available in the text, Determination of Fuhrman grade (FG) on biopsies of renal masses is relatively inaccurate, being prone to underestimating the true grade as ascertained from surgical specimens. This study evaluated whether anatomical features of tumors could predict tumor upgrading between core biopsies and surgical specimens. We prospectively enrolled 249 patients undergoing surgical resection of solid renal masses at our institution from 2012 to 2013. Tumor anatomical features were defined using RENAL nephrometry scores. Two peripheral and 1 central ex vivo core biopsies were taken from surgical specimens with an F18-gauge needle. Logistic regression was used to assess associations between covariates and FG upgrading. A comprehensive nomogram was constructed to quantitate the probability of tumor upgrading. The median tumor size was 4.75 cm and FG upgrading occurred in 43.6% of cases. In tumors of low, intermediate, and high complexity, the risk of FG upgrading was 22.0%, 47.6%, and 50.6%, respectively. According to multivariate analyses, anatomical features R (radius) and L (location) scores correlated significantly with FG upgrading. A combination of anatomical features and core biopsy findings predicted tumor upgrading with an accuracy of 0.884. With a threshold of 30%, our nomogram identified 92.4% of cases with upgrading; however, it overrated 26.8% of patients without upgrading. This ex vivo prospective study demonstrated that RENAL nephrometry score can aid prediction of FG upgrading between core biopsies and surgical specimens. Our nomogram uses anatomical features to predict true FG from renal biopsies.

Background: Desmoplastic small round cell tumor (DSRCT) is an uncommon and highly aggressive malignancy with undetermined histogenesis and poor prognosis. To date, no case of testicular DSRCT has been reported in the literature. Case: A 42-year-old Chinese man presented with painless swelling of his left testis and a painless palpable nodule in his left inguinal region. Computed tomography showed a solid mass in the left testis and multiple metastases in the body. Laboratory tests gave no abnormal results. Left radical orchiectomy was performed, and histopathological and molecular pathological examination showed typical features of DSRCT. Six cycles of chemotherapy were administrated after the operation, leading to partial remission. Postoperative 9-month follow-up indicated no progression.

Background Metabolic syndrome (MS) is a cluster of metabolic abnormalities, which has been regarded as a pivotal risk factor for cardiovascular diseases. Recent studies focusing on the relationship between MS and cancer have recognized the significant role of MS on carcinogenesis. Likewise, growing evidence suggests that MS has a strong association with increased renal cell carcinoma (RCC) risk. This review outlines the link between MS and RCC, and some underlying mechanisms responsible for MS-associated RCC. Materials and methods A National Center for Biotechnology Information PubMed search (http://www.pubmed.gov) was conducted using medical subject headings ‘metabolic syndrome’, ‘obesity’, ‘hypertension’, ‘diabetes’, ‘dyslipidemia’, and ‘renal cell carcinoma’. Results This revealed that a variety of molecular mechanisms secondary to MS are involved in RCC formation, progression, and metastasis. A deeper understanding of these molecular mechanisms may provide some strategies for the prevention and treatment of RCC. Conclusions In summary, there is a large body of evidence regarding the link between MS and RCC, within which each component of MS is considered to have a close causal association with RCC.