All clinical trials

Optical coherence tomography (OCT) is a non-invasive retinal imaging technology that can provide high-resolution cross-sectional images of the peripapillary retinal nerve fiber layer (RNFL) and measure its thickness. A reduction of the RNFL thickness has been detected in several neurodegenerative diseases, such as multiple sclerosis, CADASIL and Alzheimer's disease. Different studies have reported RNFL changes also in migraine, is a common hereditary chronic neurovascular disorder, characterized by dysfunction of the autonomic nervous system. The pathophysiology of migraine has not been fully clarified, but there is increasing evidence that episodes of migraine with aura are initiated by a focal reduction in cerebral blood flow, which occurs most commonly in the posterior region of one hemisphere. Although vasoconstriction of cerebral and retinal blood vessels is a transient phenomenon, the chronic nature of the migraine might cause permanent structural abnormalities of the brain and also of the retina, which may correlate with RNFL thinning. Previous studies on this subject, however, reported contradicting results. Some investigations reported reductions of the RNFL thickness while others did not. In the present study, in order to determine whether RNFL thickness is reduced in migraine patients, the investigators performed a meta-analysis and systematically evaluated RNFL thickness measurements with OCT in a series of migraine patients and in the healthy control groups.

Main Objective: The main objective of this retrospective observational study was to describe the evolution of visual acuity measured on ETDRS (Early Treatment Diabetic Retinopathy Study) scale, for patients with exudative Age-Related Macular Degeneration (ARMD), treated with Lucentis, under real conditions of care, in terms of mean change of the Best Corrected Visual Acuity (BCVA), measured at 24 months (± 4 weeks).

Parts of patients are diagnosed as H. pylori -negative before ER, whereas the specimens become H. pylori-positive after ER, which may have a role in the recurrence of EGC. Our study aims to determine the difference in H. pylori infection rate of EGC patients before and after ER , and discuss the causes leading to the difference, which can provide references for improving the diagnostic accuracy of H. pylori infection and reducing EGC's recurrence rate.

The investigators have planned this project to evaluate the follow-up program after surgery due to cervical cancer and to explore the possibilities for different tests of Human Papilloma Virus (HPV) in contributing to the customization of the follow-up program. Purpose: The investigators effort is to provide the background for an evidence-based update of the follow-up program after surgery due to cervical cancer with the purpose of early diagnosis of recurrence affecting quality of life for as few women as possible.

The purpose of this study is to measure the size of the round window niche and its relation to the mastoid segment of the facial nerve and the mastoid cortex, using high resolution computerized tomography of the temporal bone, in order to assess preoperatively what is the extent of obstruction of the round window membrane and whether there is a surgical possibility of round window approach in the insertion of electrode array into the cochlea

The purpose of this evaluation is to record the management and outcome of adults with S.aureus bacteraemia (SAB) across multiple European, Asian and North American sites and to identify key quality indicators associated with improved outcome.

Comparison of two antiplatelet strategies between months 1 and 12 after coronary stenting for ACS. Efficiency and tolerance évaluation

The purpose of this study is to monitor fracture risk associated with bone tumors in cancer patients. Previous studies from our lab have suggested that it is possible to compute the mechanical strength of bones with tumors using computed tomography (CT) scans, which are like three-dimensional X-ray pictures of the affected bones. The next step in determining the usefulness of this type of strength analysis is to see if we can accurately predict who is at risk for bone fracture and which patients are at high risk of fractures. This non-invasive analysis may help physicians determine the best treatment to reduce the risk of an impending bone fracture in the future.

Breast cancer biomarkers are usually performed on core needle biopsy (CNB) specimens and are not routinely repeated on surgical specimens (SS). However, preliminary data suggests that testing these biomarkers, on SS when compared to CNB samples can lead to different results. Our hypothesis is that The aim of this study is to identify a group of women with invasive breast cancer who may benefit from additional HER2 testing on their SS to ensure that areas of HER2 amplification are not missed. Another aim is to determine whether further HER2 testing on the SS in select patients would lead to changes in breast cancer treatment options.

The purpose of this study is to determine the expression of molecules involved in the glycine/serine pathway using immunohistochemistry in solid tumors. Archived paraffin-embedded pathological specimens from the Department of Pathology, NUH will be obtained. Tissue microarray (TMA) is a high-throughput method of analysing large numbers of formalin-fixed, paraffin-embedded tumor at a minimal cost and effort. To analyse the expression of molecules of putative relevance to the glycine/serine pathway, (such as PSPH, PSAT1, SHMT1, and GLDC), TMA technology will be utilised as previously reported (Kristiansen, Zhang, Soong). Tissue arrays will be constructed from solid tumors including cancers of the colon/ rectum, lung, breast, cervix, ovary, endometrium, fallopian tube, prostate, kidney, testis, stomach, liver, brain and lymphoma. One hundred cases of each tumor type (subject to availability) will be stained using immunohistochemistry. Patient Identifiers will not be collected. Societal benefit in terms of knowledge gained to improve understanding of cancer. No direct risk to subjects as this is a retrospective study of archived pathological tumour samples.