Active clinical trials for "Colorectal Neoplasms, Hereditary Nonpolyposis"

This study is being conducted to learn more about family communication of genetic risk information. Semi-structured interviews lasting up to one hour will be conducted with three populations: parent/child pairs at risk for Huntington's Disease, parent/child pairs at risk for hereditary cancer, and genetic counselors.

The purpose of this study is to find out the proportion of patients diagnosed with Lynch syndrome in colorectal cacner patients meeting Chinese Lynch syndrome criteria. Besides, this study is aimed to analyze the clinical characteristics and germline mutation of Lynch syndrome in Chinese population.

This study, conducted by NHGRI and the M.D. Anderson Cancer Center in Houston, Texas, will develop statistical approaches for modeling family social structure and apply these models to explore the role of family social structure in participation in genetic testing and counseling, disclosure of test results and adjustment to risk status. With recent genetic advances and the ability to test for hereditary illnesses, methods that provide an understanding of the family social structure and how that structure affects the dissemination of genetic risk information are increasingly important. The data for this study were collected by the M.D. Anderson Cancer Center as part of a study on family communication and family functioning with regard to genetic testing for hereditary nonpolyposis colon cancer (HNPCC). Relatives of people with HNPCC are more likely than the general population to get colon cancer and other types of cancer if they have inherited the gene alteration (mutation) that predisposes to the disease. This alteration can be passed on from a parent to some or all of his or her children. In the M.D. Anderson Cancer Center study, telephone interviews were conducted with 80 adult members of 16 extended families with a known gene alteration predisposing for HNPCC. These participants included people who had been diagnosed with an HNPCC syndrome cancer, their unaffected family members who were at risk of carrying a gene mutation for HNPCC, and their spouses. Participants were interviewed about their feelings, moods, coping style, and relationships with their spouse, relatives, and friends, about their willingness to have genetic testing, and about their feelings and beliefs about colon cancer, cancer screening and genetic testing and counseling. Some participants were asked about their family communication style and how the family coped with the idea of genetic testing and with the results, if testing was done. The information obtained from the current study may help facilitate family participation, communication and psychological adjustment regarding risk information about genetic diseases.

After informed consent, participants will be asked to complete a medical/family history questionnaire and provide a blood sample. Participants will also be asked for their permission for study investigators to access medical records and/or recontact them for updates to their medical and family histories. Data and biospecimens will be stored for potential future research projects.

Lynch Syndrome increases Endometrial Cancer Occurrence in women due to failure in MisMatch Repair System. Lifetime Cumulative risk of developing endometrial Cancer is approximatively 40% in women with Lynch Syndrome. Endometrial cancer is the third women cancer in France. Many risk factors are known in general population. Lots of factors are related to over exposure to estrogen. Data about influence of general risk factors in Women with Lynch Syndrome are poor. Recently, a cohort study appears to have shown a significant decrease in the risk of endometrial cancer with multiparity, the use of hormonal contraception and late menopause in Lynch women. The impact of weight and certain metabolic parameters on the occurrence of endometrial cancers remains poorly known to this day.

A clinically applicably strategy for molecular screening for Lynch Syndrome is being implemented in Denmark. Based on sequential analysis with immunohistochemistry and methylation analysis, patients with possible hereditary colorectal cancer are identified. These patients are offered genetic risk assessment and counselling. The study hypothesis is that molecular screening will identify more patients with Lynch Syndrome than the family history alone. Prospective data collection is performed using established clinical databases.

A clinically applicably strategy for molecular screening for Lynch Syndrome has been implemented in the Region of Southern Denmark. Based on sequential analysis with immunohistochemistry and methylation analysis, patients with possible hereditary colorectal cancer are identified. These patients are offered genetic risk assessment and counselling. The study hypothesis is that molecular screening will identify more patients with Lynch Syndrome than the family history alone. Prospective data collection is performed using established clinical databases.

The purpose of this study is to determine the proportion of patients diagnosed with Lynch syndrome in colorectal cancer patients with the loss of staining by immunohistochemistry (IHC) of any of the mismatch repair (MMR) proteins. Besides, this study aims to test the specificity and the sensitivity of detecting microsatellite instability (MSI) by next-generation sequencing, and to find out the consistency between IHC and MSI in colorectal cancer patients in China. In addition, researchers want to analyze the clinical characteristics and germline mutation of Lynch syndrome in Chinese population.

The objective of the study is the provide proof of high correlation between somatic and germline mismatch repair instability. This correlation is specifically researched in an area where patients have less access to cancer education and genetic testing for various reasons such as lack of insurance and general accessibility. The study concentrates on early diagnosis of Lynch syndrome. Lynch syndrome is usually diagnosed from a blood test resulting in a mutation of one of the mismatch repair genes. Those are MLH1, MSH2, MSH 6, PMS2. A mutation in one of these genes creates a mismatch repair instability,hence higher incidence of cancers in specific organ groups. Amongst these organs are the Uterus, Ovaries, Upper genitourinary system, Pancreas and GI system. The most common endometrial carcinoma which is found in Lynch syndrome is of endometrioid histology. Most patients with known germline mismatch repair instability, have the same somatic mutation. Our study is looking into correlating somatic mutation to germline mutation. By doing so, patients diagnosed with somatic mismatch repair instability will be also diagnosed with lynch syndrome without germline genetic testing. Screening programs will be utilized earlier and preventive procedures offered. Due to less access to educational programs, genetic counseling and testing in underserved areas, patients are sometimes lost to follow up. Our study seeks to prove high correlation between somatic and germline mutations and by doing so, patient will be diagnosed with Lynch syndrome straight after endometrial cancer staging. As a result, increased compliance will be expected and patients will be offered the recommended preventative surgeries and screening protocols.

This project seeks to identify DNA-adducts in colon tissue from different groups of patients with CRC scheduled for complete or partial colon resections. Other patients scheduled for resection of the colon serve as controls. In addition, surrogate samples such as white blood cells are investigated for the presense of adducts while blood plasma and urine are investigated for the presense of DNA-repair products.