View clinical trials related to Polyps.
Filter by:The association between lifestyle and dietary patterns with precursor lesions of colorectal cancer and cardiometabolic diseases is still unclear. This study is conducted in Jinhua, a city with a high prevalence of colorectal cancer in China, to assess the relationship between lifestyle and dietary factors with precursor lesions of colorectal cancer and cardiometabolic diseases.
Chronic sinusitis is one of the most common chronic diseases in North America, with over 5% of the Canadian population affected by the disease. Until now, treatment with surgery has been performed only in the operating room. Recently a smaller surgical procedure that is done in the clinic for some patients with chronic sinusitis with polyps has been found to result in symptom control that appears to be similar to that which occurs with sinus surgery. Performing the smaller clinical procedure has advantages including a shorter recovery time for the patient, a much lower cost to the health care system for the procedure, and a shorter patient wait time for the procedure to be done in comparison to sinus surgery performed in the operating room. To know with greater certainty that the procedure performed in the clinic is as good as the operating room sinus surgery, a large multiple investigator randomised clinical trial has been designed. However, before carrying out that trial, a practice run or internal pilot study of that trial is required to ensure that the trial can recruit patients at the rate that is anticipated and that the procedures to obtain the measurements being used for the larger study are adequate.
Early cancers of the rectum can be removed safely through the anus without subjecting patients to major abdominal surgery in a procedure called TEMS (transanal endoscopic microsurgery). Patients undergoing TEMS can benefit from reduced mortality, impotence, hospital stay and avoiding a stoma that may be associated with pelvic surgery. Currently few of the patients eligible for TEMS are offered it for a variety of reasons that include uncertainties about the risk of leaving residual tumour and the increased risk of subsequent recurrence of cancer within the pelvis. Current UK guidelines state there is no role for imaging in assessing the malignant polyp. Conversely whilst retrospectively reviewing their MRI databank the investigators have found evidence that MRI can accurately judge the depth of these early tumours and thereby potentially identify patients for local excision. The investigators hope to prospectively test their hypothesis that an MRI scan can accurately gauge depth of tumour spread in an unselected group of benign and malignant tumours measuring between 20mm and 50mm in size. The investigators will identify eligible patients awaiting surgery / polypectomy and if they consent to this pilot study participants will undergo an MRI to assess their tumour which assesses safety at all levels of the rectal wall. The accuracy of MRI can then be established by reference to gold standard histopathology. Should MRI prove sensitive and specific then the investigators hope to change national guidelines to mandate MRI to standardise assessment and thereby increase the appropriate use of TEMS in the UK.
The aim of the study is to develop a computer program which is able to distinguish between adenomatous and non- adenomatous polyps on the basis of optical features of the polyps. Still images of polyps (< 10 mm of size) will be collected during routine colonoscopy procedures. All polyps will be resected endoscopically so that histopathological diagnoses (gold standard) can be notified. In the validation phase of the study a computer program will be established which aims to distinguish between adenomatous and non- adenomatous polyps on the basis of optical features derived from still images. The program will operated using the the random forest learning method. Afterwards, in the testing phase of the study, still images of 100 polyps (not used in the validation phase) will be presented to the computer program. The establishment of a well- functioning computer program is the primary aim of the study.
The effectiveness of colonoscopy in reducing colorectal cancer mortality relies on the detection and removal of neoplastic polyps. Because the risk of prevalent cancer and of transition to cancer increases with polyp size, effective and safe resection of large polyps is particularly important. Large polyps ≥20mm are removed by so-called endoscopic mucosal resection (EMR) using electrocautery snares. Resection of these large polyps is associated with a risk of severe complications that may require hospitalization and additional interventions. The most common risk is delayed bleeding which is observed in approximately 2-9% of patients. A recent retrospective study suggests that closure of the large mucosal defect after resection may decrease the risk of delayed bleeding. However, significant uncertainty remains about the polypectomy techniques to optimizing resection and minimizing risk. Important aspects that may affect risk include clipping of the mucosal defect and electrocautery setting.
The objective of this study is to demonstrate the safety and effectiveness of community gynecologist initiated treatment of intra-uterine polyps and submucosal fibroids with the MyoSure Hysteroscopic Tissue Removal System in a significantly sized patient population.
The purpose of this study is to demonstrate safety and effectiveness of the MyoSure Tissue Removal System when used by community gynecologists in an office setting for the treatment of patients with symptomatic intrauterine polyps and submucosal fibroids.