View clinical trials related to Rectal Cancer.
Filter by:Several studies have shown that tumour hypoxia may have a negative impact on the outcome of anticancer treatment. Assessment of tumor hypoxia at baseline or shortly after start of treatment may serve as a predictive marker to determine treatment efficacy at an early stage. Preferably, such an assessment is performed in vivo and non-invasively.Non-invasive imaging with positron emission tomography (PET) using the 2-nitroimidazole nucleoside analogue, 3-18F-fluoro-2-(4-((2-nitro-1H-imidazol-1-yl)methyl)-1H-1,2,3-triazol-1- yl)propan-1-ol (18F-HX4), was tested as a new marker of tumor hypoxia. Before hypoxia-measurements can be clinically implemented for response prediction, the reproducibility of the technique should be assessed for each specific tumor type. Knowledge of reproducibility is needed to determine what change in parameters between two examinations can be considered relevant in an individual patient. Assessment of reproducibility becomes even more important in early response monitoring since the changes in the tumor induced by the treatment may be smaller during the treatment compared to response monitoring after completion of treatment. Also, as image quality of 18F-HX4-PET increases with increasing time intervals after injection, determination of the optimal time point for measurement of hypoxia is warranted.
Colorectal neoplasms are the third most common malignancies in the United States. Patients with metastatic (stage IV) colorectal cancer have a median life expectancy of 2 years. The response rates to chemotherapy range from 35-40%. Epidemiologic evidence suggests that soy compounds may reduce the incidence of colorectal cancers. Laboratory analyses demonstrate that genistein, a soy-derived compound, may inhibit Wnt signaling, a pathway activated in majority of colorectal cancers. Laboratory observations also demonstrate that genistein may augment growth inhibition when combined with chemotherapeutic agents of 5-Fluorouracil and platinum compounds. Based on pre-clinical data the investigators hypothesize that combining genistein with the standard of care chemotherapeutic regimens will reduce chemotherapy resistance and improve response rates in patients. The aim of the study is to add genistein to the regimens of FOLFOX or FOLFOX-Avastin in patients with newly diagnosed stage IV colon or rectal neoplasms.
In this study, the investigators assessed the difference in efficacy and safety among robotic-assisted versus laparoscopic abdominoperineal resection for patients with low rectal cancer.
To improve rectal cancer management, there is a need for better visualization of drug targets in rectal cancer to identify patients who might benefit from specific targeted treatments. Molecular imaging of rectal cancer associated targets is a promising technique to accommodate this need. Vascular Endothelial Growth Factor (VEGF), which is differentially expressed in normal versus malignant colon tissue, has proven to be a valid target for molecular imaging. Fluorescent labeling of bevacizumab (a VEGF targeting humanized monoclonal antibody currently used in anti-cancer therapy) using IRDye800CW (a fluorescent dye) has potential advantages in view of safety, infrastructure, costs, stability and imaging resolution. Therefore, the fluorescent tracer bevacizumab-IRDye800CW has been developed at the University Medical Center Groningen (UMCG) and was recently approved to be administered to patients in a tracer dose. To detect this tracer in vivo in patients with colorectal cancer, a newly developed flexible near-infrared (NIR) fluorescence endoscope and optoacoustic endoscope have been developed which can be used in clinical studies. Optical fluorescence imaging may support response evaluation following chemoradiotherapy and give insight which patient might benefit from anti-VEGF targeted therapy in future studies.
The purpose of this study is evaluation of the safety and the efficacy of transanal total mesorectal excision.
Rationale: Approximately 800 abdominoperineal resections (APR) are performed for rectal cancer each year in the Netherlands. The extralevator approach (eAPR) reduces the rate of positive margins and improves oncological outcome in distal rectal cancer. However, wider excisions increase wound healing problems and development of perineal hernia. This has resulted in a progressive increase of the use of musculocutaneous flaps and biological meshes associated with a substantial increase of costs, which is not supported by proper data. Objective: The aim of this study is to determine the cost-effectiveness of pelvic floor reconstruction using a biological mesh after standardized eAPR with neo-adjuvant (chemo)radiotherapy. Study design: This is a multicenter study in which patients undergoing an eAPR are randomized between standard care using primary closure of the perineum and the experimental arm with assisted closure using a biological mesh. Study population: Patients with a clinical diagnosis of primary rectal cancer who are scheduled for eAPR after neo-adjuvant (chemo)radiotherapy. A total number of 104 patients will be randomized. Intervention: The intervention in the experimental arm consists of suturing a biological mesh derived from porcine dermis in the pelvic floor defect, followed by perineal closure similar to the control arm. Main study parameters/endpoints: The primary endpoint is the percentage of uncomplicated perineal wound healing (Souphampton wound score less than II at day 30). Secondary endpoints are hospital stay, incidence of perineal hernia, quality of life, and costs. Nature and extent of the burden and risks associated with participation, benefit and group relatedness: Both primary perineal closure and biological mesh assisted closure are being performed in daily clinical practise. The potential benefit resulting from participation of the study in patients randomized for biological mesh assisted closure may be a higher chance of uncomplicated perineal wound healing and lower perineal hernia rate. On the other hand, the use of a biological mesh has been associated with increased postoperative pain and seroma formation.
Patients' ability to tolerate surgery is associated with physical fitness: less fit patients have an increased rate of death and serious complications following major surgery. Combined chemotherapy and radiotherapy (x-rays) prior to rectal cancer surgery is known as neo-adjuvant chemoradiotherapy (NACRT) and is associated with improved cancer removal but adversely affects physical fitness. In Liverpool, the investigators have pre-pilot data showing that NACRT reduces objectively measured physical fitness (measured by cardiopulmonary exercise testing) in patients having surgery. This pre-pilot study investigated the effects of a 6-week structured responsive endurance training programme (SRETP) after NACRT and before cancer surgery. This programme has improved both their fitness and their health related quality of life(HRQL). Now, the investigators are undertaking a randomised controlled trial to compare changes in patient's physical fitness in response to SRETP with a group of patients who will be given exercise advice. The SRETP group will exercise 3 times a week for 9 weeks. The investigators will make objective measurements of physical fitness in both groups. The investigators will monitor patient's perceptions of the training programme, HRQL, daily activity (using an accelerometer), and outcomes after surgery. The investigators believe that, patients in the exercise group will improve their physical fitness prior to surgery, change behaviour towards exercise, improve activity and HRQL following NACRT. These results will contribute to the design of a large, multi-centre trial to determine whether a SRETP increases physical fitness with a reduction in adverse outcome following surgery. The investigators will conduct an adequately powered randomized controlled trial (RCT) comparing a SRETP with 'exercise advice' in 46 rectal cancer patients. Specifically, we will test the following hypotheses and outcomes: PRIMARY HYPOTHESIS A 9-week, structured responsive endurance training programme (SRETP) compared with a control group (no training) will result in a clinically significant difference in physical fitness (2.0ml/kg/min VO2 at LT) post-NACRT prior to surgery. SECONDARY OUTCOMES 1. A 9-week SRETP compared with a control group (no training) will result in a clinically significant difference in physical fitness (2.0ml/kg/min VO2Peak) in patients who have had NACRT prior to surgery. 2. SRETP following NACRT and prior to cancer surgery will provide psychological health benefits and improve patient's HRQL (assessed by semi-structured interviews and questionnaires -EORTC QLQ-30 and EQ-5D). This will provide vital exploratory information that will inform a future application to deliver a larger appropriately powered RCT exploring the hypothesis that patients with greater pre-operative fitness will encounter lower postoperative morbidity and mortality. Specifically, these exploratory outcomes are: EXPLORATORY OUTCOMES 1. To investigate whether SRETP following NACRT and prior to surgery is associated with a change in overall physical activity (assessed by the number of steps while active using an accelerometer). 2. To investigate whether there is a change in the day 7 surgical morbidity (using the Post-Operative Morbidity Survey) and mortality. 3. The effect of SRETP on cancer downstaging post-NACRT (Tumour, Node and Metastasis Staging-TNM staging).
The purpose of this project is to implement and evaluate an intervention to increase and sustain rates of use of colorectal cancer (CRC) screening among men and women aged 50 and older in 6 intervention counties in Appalachia Ohio. Researchers will employ community-based participatory research (CBPR) in combination with two CRC interventions that have been developed and piloted with community partners to improve CRC screening
45 patients undergoing a colon (large bowel/intestine)removal operation for the diagnosis of colon cancer will be included in this study. During colon operation the affected portion of the colon is removed. In addition, lymph nodes are included in the specimen and evaluated by a pathologist. Analysis of the lymph nodes in the specimen are important because this is an important aspect of determining the stage of the cancer. Once the standard technique is used for the colon removal operation and the specimen is removed it will be injected with two drugs to help identify the lymph nodes. One is a blue dye and the other a radiotracer. The colon and ALL of the lymph nodes will then be sent for the standard pathologic evaluation. The patient themselves will never be injected with these drugs being used for research. Following the standard lymph node evaluation, an additional pathologist at an outside research facility will further examine the lymph nodes in the specimen using more in depth techniques which are above and beyond the standard of care. The results of all the pathologic tests will be conveyed to the surgeon of record to help in their decision making regarding further treatment. The study hypothesis is that radiotracer will be at least as effective as blue dye in identifying the lymph nodes most likely to harbor cancer cells (sentinel nodes). Once identified, these sentinel nodes can then undergo a more in depth review leading to improved staging of colorectal cancer and more accurate treatment.
The two surgical options for lower 1/3 rectal cancer is APR and sphincter sparing procedures. Intersphincteric resection is procedure to treat very low rectal cancer within 2 cm from the dentate line to avoid permanent colostomy,improves the quality of life with better genitourinary function. Neoadjuvant chemo-radiotherapy is routine for T3 cases.