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Zhang S, Ta N, Zhang S, Li S, Zhu X, Kong L, Gong X, Guo M, Liu Y. Unraveling pancreatic ductal adenocarcinoma immune prognostic signature through a naive B cell gene set. Cancer Lett 2024; 594:216981. [PMID: 38795761 DOI: 10.1016/j.canlet.2024.216981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 05/14/2024] [Accepted: 05/17/2024] [Indexed: 05/28/2024]
Abstract
BACKGROUND Pancreatic ductal adenocarcinoma (PDAC), a leading cause of cancer mortality, has a complex pathogenesis involving various immune cells, including B cells and their subpopulations. Despite emerging research on the role of these cells within the tumor microenvironment (TME), the detailed molecular interactions with tumor-infiltrating immune cells (TIICs) are not fully understood. METHODS We applied CIBERSORT to quantify TIICs and naive B cells, which are prognostic for PDAC. Marker genes from scRNA-seq and modular genes from weighted gene co-expression network analysis (WGCNA) were integrated to identify naive B cell-related genes. A prognostic signature was constructed utilizing ten machine-learning algorithms, with validation in external cohorts. We further assessed the immune cell diversity, ESTIMATE scores, and immune checkpoint genes (ICGs) between patient groups stratified by risk to clarify the immune landscape in PDAC. RESULTS Our analysis identified 994 naive B cell-related genes across single-cell and bulk transcriptomes, with 247 linked to overall survival. We developed a 12-gene prognostic signature using Lasso and plsRcox algorithms, which was confirmed by 10-fold cross-validation and showed robust predictive power in training and real-world cohorts. Notably, we observed substantial differences in immune infiltration between patients with high and low risk. CONCLUSION Our study presents a robust prognostic signature that effectively maps the complex immune interactions in PDAC, emphasizing the critical function of naive B cells and suggesting new avenues for immunotherapeutic interventions. This signature has potential clinical applications in personalizing PDAC treatment, enhancing the understanding of immune dynamics, and guiding immunotherapy strategies.
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Affiliation(s)
- Shichen Zhang
- Software Engineering Institute, East China Normal University, Shanghai 200062, China
| | - Na Ta
- Department of Pathology, Changhai Hospital, Navy Medical University, Shanghai 200433, China
| | - Shihao Zhang
- National Key Laboratory of Immunity and Inflammation & Institute of Immunology, Navy Medical University, Shanghai 200433, China
| | - Senhao Li
- National Key Laboratory of Immunity and Inflammation & Institute of Immunology, Navy Medical University, Shanghai 200433, China
| | - Xinyu Zhu
- National Key Laboratory of Immunity and Inflammation & Institute of Immunology, Navy Medical University, Shanghai 200433, China
| | - Lingyun Kong
- National Key Laboratory of Immunity and Inflammation & Institute of Immunology, Navy Medical University, Shanghai 200433, China
| | - Xueqing Gong
- Software Engineering Institute, East China Normal University, Shanghai 200062, China.
| | - Meng Guo
- National Key Laboratory of Immunity and Inflammation & Institute of Immunology, Navy Medical University, Shanghai 200433, China.
| | - Yanfang Liu
- Department of Pathology, Changhai Hospital, Navy Medical University, Shanghai 200433, China; National Key Laboratory of Immunity and Inflammation & Institute of Immunology, Navy Medical University, Shanghai 200433, China.
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Sheikh-Ahmad M, Shalata Y, Bejar J, Kreizman Shefer H, Sirhan MF, Laniado M, Matter I, Agbarya A, Reut M, Yovanovich E, Saiegh L. The Correlation between Proliferative Immunohistochemical Markers and Papillary Thyroid Carcinoma Aggressiveness. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:medicina59010110. [PMID: 36676734 PMCID: PMC9862399 DOI: 10.3390/medicina59010110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 12/27/2022] [Indexed: 01/07/2023]
Abstract
Background and Objectives: Papillary thyroid carcinoma (PTC) is one of the most common malignancies of the endocrine system. In order to improve the ability to predict tumor behavior, several studies have been conducted to search for surrogate prognostic immunohistochemical tumor markers. Objective: To evaluate the correlation between the intensity of different immunohistochemical marker staining in PTC and the risk for extrathyroidal extension and metastases. Materials and Methods: The study comprised patients who underwent hemi- or total thyroidectomy. Thyroid tissues were immunohistochemically stained for different tumor proliferative markers: Minichromosome maintenance proteins 2 (MCM2), Ki-67 labeling index, E-Cadherin, Neuropilin-1 and Metallothionein. The correlation between the intensity of each marker staining and the final diagnosis (benign neoplasm and PTC) and the correlation between the intensity of each staining and tumor extrathyroidal extension and metastases were evaluated. Results: The study included 66 patients. Staining for Metallothionein, E-Cadherin and MCM2 significantly differed between benign neoplasm (n = 22) and thyroid-confined PTC (n = 21) (p = 0.002, 0.004 and 0.005, respectively), between benign neoplasm and PTC with extrathyroidal extension (n = 11) (p = 0.001, 0.006 and 0.01, respectively), and between benign neoplasm and PTC with metastases (n = 12) (p = 0.01, <0.001 and 0.037, respectively). No staining correlated with extrathyroidal extension. The intensity of E-Cadherin staining was significantly lower in PTC with metastases than thyroid confined PTC and PTC with extrathyroidal extension (p = 0.028 and 0.021, respectively). Conclusions: Immunohistochemical staining for Metallothionein, E-Cadherin and MCM2 significantly distinguished between benign thyroid tumor and PTC. E-Cadherin staining significantly and inversely correlated with the presence of metastases.
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Affiliation(s)
- Mohammad Sheikh-Ahmad
- Institute of Endocrinology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
- Correspondence: ; Tel.: +972-4-8359510; Fax: +972-4-8359519
| | - Yara Shalata
- Institute of Endocrinology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Jacob Bejar
- Department of Pathology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Hila Kreizman Shefer
- Department of Pathology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Majd F. Sirhan
- Department of Pathology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Monica Laniado
- Department of Surgery, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Ibrahim Matter
- Department of Surgery, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Abed Agbarya
- Department of Oncology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Maria Reut
- Institute of Endocrinology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Ekaterina Yovanovich
- Institute of Endocrinology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
| | - Leonard Saiegh
- Institute of Endocrinology, Bnai Zion Medical Center, 47 Golomb St., Haifa 31048, Israel
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Wei S, Yu X, Wen X, Zhang M, Lang Q, Zhong P, Huang B. Genetic Variations in Metallothionein Genes and Susceptibility to Hypertensive Disorders of Pregnancy: A Case-Control Study. Front Genet 2022; 13:830446. [PMID: 35734434 PMCID: PMC9208279 DOI: 10.3389/fgene.2022.830446] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 04/19/2022] [Indexed: 01/07/2023] Open
Abstract
Background: The involvement of oxidative stress in the pathological process of hypertensive disorders of pregnancy (HDP) gives rise to the interest in exploring the association of genetic variations in antioxidant metallothionein (MT) genes with HDP susceptibility. Methods: Seventeen single-nucleotide polymorphisms(SNPs) in MT genes were selected to conduct genotyping based on a case-control study consisting of 371 HDP cases (pregnancy with chronic hypertension (66), gestational hypertension (172), and preeclampsia or preeclampsia superimposed on chronic hypertension (133)) and 479 controls. The association between SNPs in MTs and the risk of HDP was estimated with unconditional logistic regression analysis and further tested with the false-positive report probability (FPRP) procedure. The joint effects of SNPs on the HDP risk were assessed by haplotype analysis. Results: After the adjustment for age and pre-pregnancy body mass index (pre-BMI) in the logistic regress analysis and followed by the FPRP test, the genetic variation rs10636 (OR = 0.46, 95% CI: 0.30–0.71 for GG vs. CC, p = 0.000 and OR = 0.48, 95% CI: 0.32–0.73 for GG vs. CG/CC, p = 0.001) in MT2A was associated with gestational hypertension. Other four SNPs, that is, rs11076161 (OR = 1.89, 95% CI: 1.35–2.63 for GG vs. GA/AA, p = 0.000) in MT1A; rs7191779 (OR = 1.54, 95% CI: 1.11–2.13 for CC vs. CG/GG, p = 0.010) in MT1B; rs8044719 (OR = 0.57, 95% CI: 0.40–0.80 for GT vs. GG, p = 0.001) in MT1DP; and rs8052334 (OR = 1.52, 95% CI: 1.10–2.11 for TT vs. TC/CC, p = 0.012) in MT1B were significantly associated with the susceptibility of HDP. The haplotype analysis among 11, 10, 10, and seven SNPs in MT (MT1A, MT2A, MT1M, MT1B, and MT1DP) genes showed that eight (A-C-G-T-C-G-A-G-C-G-C, OR = 4.559; A-C-T-C-C-C-A-G-C-G-C, OR = 5.777; A-C-T-T-C-G-A-G-C-G-C, OR = 4.590; G-A-T-C-C-G-C-G-G-C-C, OR = 4.065; G-A-T-C-G-C-C-G-G-C-C, OR = 4.652; G-A-T-T-C-C-C-G-G-C-C, OR = 0.404; G-C-T-C-C-C-A-G-G-C-C, OR = 1.901; G-C-T-T-C-C-A-G-G-C-C, and OR = 3.810), five (C-G-A-T-C-A-C-C-G-G, OR = 2.032; C-G-A-T-C-G-C-C-G-G, OR = 2.077; G-A-C-T-C-A-C-C-T-G, OR = 0.564; G-G-A-G-C-A-C-C-G-G, OR = 5.466; G-G-A-T-T-A-G-C-G-G, and OR = 0.284), five (A-C-G-T-C-G-A-G-C-C, OR = 2.399; A-C-T-C-C-C-C-T-G-G, OR = 0.259; G-A-T-C-C-C-C-G-G-C, OR = 1.572; G-A-T-C-G-C-C-G-G-C, OR = 0.001; G-C-T-C-G-C-A-G-G-C, and OR = 2.512), and five (A-C-T-C-C-C-G, OR = 0.634; G-A-G-C-C-C-G, OR = 4.047; G-A-T-T-G-C-G, OR = 0.499; G-C-G-T-C-A-G, and OR = 7.299; G-C-T-C-C-A-G, OR = 1.434) haplotypes were significantly associated with pregnancy with chronic hypertension, gestational hypertension, preeclampsia, or preeclampsia superimposed on chronic hypertension and HDP. Conclusion: These variant MT alleles and their combination patterns may be used as genetic markers for predicting HDP susceptibility.
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Affiliation(s)
- Shudan Wei
- Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Health, Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, Guilin Medical University, Guilin, China
| | - Xiangyuan Yu
- Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Health, Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, Guilin Medical University, Guilin, China
| | - Xiaolan Wen
- Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Health, Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, Guilin Medical University, Guilin, China
| | - Min Zhang
- Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Health, Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, Guilin Medical University, Guilin, China
| | - Qi Lang
- Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Health, Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, Guilin Medical University, Guilin, China
| | - Ping Zhong
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Guilin Medical University, Guilin, China
| | - Bo Huang
- Guangxi Key Laboratory of Environmental Exposomics and Entire Lifecycle Health, Guangxi Health Commission Key Laboratory of Entire Lifecycle Health and Care, Guilin Medical University, Guilin, China
- *Correspondence: Bo Huang,
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Mizdrak M, Tičinović Kurir T, Božić J. The Role of Biomarkers in Adrenocortical Carcinoma: A Review of Current Evidence and Future Perspectives. Biomedicines 2021; 9:174. [PMID: 33578890 PMCID: PMC7916711 DOI: 10.3390/biomedicines9020174] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 02/07/2021] [Accepted: 02/08/2021] [Indexed: 12/18/2022] Open
Abstract
Adrenocortical carcinoma (ACC) is a rare endocrine malignancy arising from the adrenal cortex often with unexpected biological behavior. It can occur at any age, with two peaks of incidence: in the first and between fifth and seventh decades of life. Although ACC are mostly hormonally active, precursors and metabolites, rather than end products of steroidogenesis are produced by dedifferentiated and immature malignant cells. Distinguishing the etiology of adrenal mass, between benign adenomas, which are quite frequent in general population, and malignant carcinomas with dismal prognosis is often unfeasible. Even after pathohistological analysis, diagnosis of adrenocortical carcinomas is not always straightforward and represents a great challenge for experienced and multidisciplinary expert teams. No single imaging method, hormonal work-up or immunohistochemical labelling can definitively prove the diagnosis of ACC. Over several decades' great efforts have been made in finding novel reliable and available diagnostic and prognostic factors including steroid metabolome profiling or target gene identification. Despite these achievements, the 5-year mortality rate still accounts for approximately 75% to 90%, ACC is frequently diagnosed in advanced stages and therapeutic options are unfortunately limited. Therefore, imperative is to identify new biological markers that can predict patient prognosis and provide new therapeutic options.
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Affiliation(s)
- Maja Mizdrak
- Department of Nephrology and Hemodialysis, University Hospital of Split, 21000 Split, Croatia;
- Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia;
| | - Tina Tičinović Kurir
- Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia;
- Department of Endocrinology, Diabetes and Metabolic Disorders, University Hospital of Split, 21000 Split, Croatia
| | - Joško Božić
- Department of Pathophysiology, University of Split School of Medicine, 21000 Split, Croatia;
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Pan YQ, Niu M, Liu SM, Bao YX, Yang K, Ma XB, He L, Li YX, Cao JX, Zhang X, Du Y. Effect of MT2A on apoptosis and proliferation in HL60 cells. Int J Med Sci 2021; 18:2910-2919. [PMID: 34220318 PMCID: PMC8241764 DOI: 10.7150/ijms.57821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 05/14/2021] [Indexed: 11/15/2022] Open
Abstract
Although accumulating evidence has revealed that metallothioneins (MTs) and its family member MT2A are strongly linked to the risk of various solid tumors, researches on the occurrence and development of acute myeloid leukemia (AML) have rarely been investigated. Here, we constructed a lentiviral vector with MT2A over-expression and the interfering plasmids with MT2A expression inhibition to study the influence of MT2A on the bioactivities of HL60 cells. After cells were infected with a lentiviral vector containing the MT2A gene, both transcription and translation levels of MT2A were significantly increased in the over-expressed group in comparison with control groups. In vitro experiments, all results demonstrated that cell reproductive capacity was inhibited, but cell apoptosis rate was significantly increased. Together, the expression of apoptosis-related protein Bcl2 was remarkably reduced, while a high expression level of Bax protein was detected. Further experiments revealed that up-regulation of MT2A induced cell apoptosis and promoted G2/M phase arrest. The mechanism may be associated with down-regulated p-IκB-α and cyclinD1 expression and up-regulated IκB-α expression in the nuclear factor-kappaB (NF-κB) pathway. On the contrary, MT2A expression was down-regulated by interfering plasmids. We found that cell proliferative potential was notably increased in the interfering group compared with the negative and untreated group. What's more, MT2A may be closely related to AML cell proliferation and function via the NF-κB signal pathway.
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Affiliation(s)
- Yu-Qing Pan
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Min Niu
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Shu-Min Liu
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Yu-Xia Bao
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Kai Yang
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Xiao-Bo Ma
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Liang He
- Department of Clinical Laboratory, Yunnan Cancer Hospital, the Third Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Yi-Xun Li
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Jie-Xian Cao
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Xi Zhang
- Department of Clinical Laboratory, Yunnan Cancer Hospital, the Third Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
| | - Yan Du
- Department of Clinical Laboratory, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China.,Yunnan Key Laboratory of Laboratory Medicine, Kunming, Yunnan, P.R. China.,Yunnan Innovation Team of Clinical Laboratory and Diagnosis, the First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P.R. China
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Xu F, Zhang P, Yuan M, Yang X, Chong T. Bioinformatic screening and identification of downregulated hub genes in adrenocortical carcinoma. Exp Ther Med 2020; 20:2730-2742. [PMID: 32765768 PMCID: PMC7401943 DOI: 10.3892/etm.2020.8987] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 04/17/2020] [Indexed: 12/11/2022] Open
Abstract
The molecular mechanisms of adrenocortical carcinoma (ACC) carcinogenesis and progression remain unclear. In the present study, three microarray datasets from the Gene Expression Omnibus database were screened, which identified a total of 96 differentially expressed genes (DEGs). A protein-protein interaction network (PPI) was established for these DEGs and module analysis was performed using STRING and Cytoscape. A total of eight hub genes were identified from the most significant module; namely, calponin 1 (CNN1), myosin light chain kinase (MYLK), cysteine and glycine rich protein 1 (CSRP1), myosin heavy chain 11 (MYH11), fibulin extracellular matrix protein 2 (EFEMP2), fibulin 1 (FBLN1), microfibril associated protein 4 (MFAP4) and fibulin 5 (FBLN5). The biological functions of these hub genes were analyzed using the DAVID online tool. Changes in the expression of hub genes did not affect overall survival; however, downregulated EFEMP2 decreased disease-free survival. CSRP1 and MFAP4 expression levels were associated with adverse clinicopathological features. In conclusion, although all eight hub genes were downregulated in ACC, they appeared to have important functions in ACC carcinogenesis and progression. Identification of these genes complements the genetic expression profile of ACC and provides insight for the diagnosis, treatment and prognosis of ACC.
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Affiliation(s)
- Fangshi Xu
- Department of Urology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China.,Department of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Peng Zhang
- Department of Urology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
| | - Miao Yuan
- Department of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Xiaojie Yang
- Department of Urology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
| | - Tie Chong
- Department of Urology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710000, P.R. China
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