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Wu P.,Peking University | Wu P.,National Urological Cancer Center | Zhang N.,Capital University of Medicine science | Wang X.,Peking University | And 8 more authors.
Journal of Human Genetics | Year: 2012

Von Hippel-Lindau (VHL) disease is an autosomal dominant familial cancer syndrome caused by germline mutations in VHL tumor suppressor gene. It is characterized by hemangioblastoma in central nervous system and retina, renal cell carcinoma or cyst, pheochromocytoma, pancreatic cyst and tumor, endolymphatic-sac tumor, and papillary cystadenoma in epididymis and broad ligament. Here, we used PCR-direct sequencing and universal primer quantitative fluorescent multiplex PCR (UPQFM-PCR) to detect VHL mutations in 16 patients clinically diagnosed with VHL disease. PCR-direct sequencing detected 12 germline mutations (75%, 12/16), in which a novel mutation of c.451A>T/p.Ile151Phe found in one proband had not been reported previously. UPQFM-PCR found two large deletions (12.5%, 2/16). The two remaining patients carried non-typical disease-causing mutations, including one silent mutation (c.481C>A/p.Arg161Arg) and one mutation in 3′-UTR (c.642+70C>A). Remarkably, 56.3% (9/16) probands did not have family history of VHL disease, suggesting the higher frequency of de novo mutations in Chinese patients. We also summarized Chinese VHL disease patients with VHL mutation findings published in the literature to provide information about the spectrum of VHL mutations in Chinese VHL disease patients. © 2012 The Japan Society of Human Genetics All rights reserved. Source


Wu P.,Peking University | Zhang N.,Capital University of Medicine science | Wang X.,Peking University | Zhang C.,Peking University | And 3 more authors.
PLoS ONE | Year: 2012

Co-expression of erythropoietin (Epo) and erythropoietin receptor (EpoR) has been found in various non-hematopoietic cancers including hereditary and sporadic renal cell carcinomas (RCC), but the Epo/EpoR autocrine and paracrine mechanisms in tumor progression have not yet been identified. In this study, we used RNA interference method to down-regulate EpoR to investigate the function of Epo/EpoR pathway in human RCC cells. Epo and EpoR co-expressed in primary renal cancer cells and 6 human RCC cell lines. EpoR signaling was constitutionally phosphorylated in primary renal cancer cells, 786-0 and Caki-1 cells, and recombinant human Epo (rhEpo) stimulation had no significant effects on further phosphorylation of EpoR pathway, proliferation, and invasiveness of the cells. Down-regulation of EpoR expression in 786-0 cells by lentivirus-introduced siRNA resulted in inhibition of growth and invasiveness in vitro and in vivo, and promotion of cell apoptosis. In addition, rhEpo stimulation slightly antagonized the anti-tumor effect of Sunitinib on 786-0 cells. Sunitinib could induce more apoptotic cells in 786-0 cells with knockdown EpoR expression. Our results suggested that Epo/EpoR pathway was involved in cell growth, invasion, survival, and sensitivity to the multi-kinases inhibitor Sunitinib in RCC cells. © 2012 Wu et al. Source


Jun L.,Capital University of Medicine science | ChangYi S.,Capital University of Medicine science
Indian Journal of Surgery | Year: 2015

Early intestinal obstruction is easily misdiagnosed. Many physicians consider terminal bouton if computed tomography (CT) scan is done. However, different examinations provide diverse information and significance. This retrospective, randomized, clinical study investigated the diagnostic value of three imaging modalities for intestinal obstruction, supine and upright (or decubitus) plain abdominal radiography, contrast radiography using Gastrografin, and 64 multi-slice spiral CT (MSCT). A total 142 patients with intestinal obstruction were examined. The diagnostic accuracy of plain radiography, contrast radiography, and MSCT for detecting small bowel obstruction was 62.5, 85, and 77.5 %, for localizing the obstruction was 0, 90, and 78.75 %, and for determining the cause of obstruction was 0, 71, and 65 %, respectively. The diagnostic accuracy for detecting large bowel obstruction was 53.23, 73.17, and 92 %, and for localizing the obstruction was 38.17, 60.98, and 98 %, respectively. The diagnostic accuracy of MSCT in determining the cause of obstruction was 91 %. None of the patients administered Gastrografin experienced any adverse effects. In conclusion, MSCT has great diagnostic value in identifying the site and cause of intestinal obstruction, especially in cases of large bowel obstruction. Contrast radiography using Gastrografin was effective in diagnosing and treating small bowel obstruction, making it a beneficial adjunct to MSCT. © 2015, Association of Surgeons of India. Source


Zhang N.,Capital University of Medicine science | Gong K.,Peking University | Zhang X.,Capital University of Medicine science | Yang Y.,Capital University of Medicine science | Na Y.,Peking University
Urologic Oncology: Seminars and Original Investigations | Year: 2010

Objectives: We evaluate the clinical manifestations, management, and prognostic characteristics of scrotal extramammary Paget's disease (EMPD). Methods: The study comprised 25 patients with scrotal EMPD at our institute from January 1982 to February 2005, with all available clinical and pathological data reviewed. Results: Of these 25 patients, 1 received radiotherapy and 24 received local wide excisions. In 24 operated patients, 7 had local recurrence and/or metastasis of groin lymph node. Five of the 7 with recurrence had a positive surgical margin postoperatively and they received a second local extensive excision. One of the 7 with recurrence and metastasis of the groin lymph node had a second local extensive excision with groin lymphadenectomy, and the last one who only had metastasis of the groin lymph node had a groin lymphadenectomy. Four of 13 patients with dermal invasion by Paget's cell had metastasis. None of the other 12 patients without dermal invasion had metastasis. However, there was no statistical metastasis rate difference (P = 0.096) between the patients with dermal invasion by Paget's cell and without. There was no statistical difference (P = 0.947) in mean delay time from onset of symptoms to diagnosis between the 2 groups either. The follow-up duration varies from 17 to 243 months (mean 119 + 86.2 months). One patient with stage D died of EMPD of the scrotum. Conclusions: We found that EMPD of the scrotum is usually a slow progressive disease, mainly seen in elderly patients, and has a good prognosis when there is noninvasive disease. The primary treatment for EMPD of the scrotum is wide surgical excision. The key to decreasing tumor recurrence, however, is a precise, preoperative histological examination to define the range of the lesion. © 2010 Elsevier Inc. All rights reserved. Source


Hua L.,Capital University of Medicine science | Yang Z.,Capital University of Medicine science | Liu H.,Capital University of Medicine science
2012 5th International Conference on Biomedical Engineering and Informatics, BMEI 2012 | Year: 2012

Non-synonymous SNPs (nsSNPs), also known as Single Amino acid Polymorphisms (SAPs), are likely to affect the function of the proteins accounting for susceptibility to complex disease for their altering the encoded amino acid sequence. Recent advances in genetic studies found that the non-synonymous variations locating in disordered regions are functionally important. We therefore considered predicting deleterious SAPs based on both protein interaction network and disordered protein property. We used one of functional prediction algorithms of nsSNPs, PolyPhen-2, to distinguish SAPs as damaging or benign. Four classifiers: naïve Bayes, k-Nearest Neighbor (kNN), Support Vector Machine (SVM) and Random Forests (RF) were used to classify SAPs. As a result, the prediction accuracies of four classifiers are all over 70%, and the three features (degree, clustering coefficient and disorder score) were found to be potential predictor variables to classify nsSNPs. © 2012 IEEE. Source

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