Mismatch repair genes status in sporadic Saudi colorectal cancer patients

Heterogenous mismatch-repair status in colorectal cancer

BACKGROUND Immunohistochemical staining for mismatch repair proteins is efficient and widely used to identify mismatch repair defective tumors. The tumors typically show uniform and widespread loss of MMR protein staining. We identified and characterized colorectal cancers with alternative, heterogenous mismatch repair protein staining in order to delineate expression patterns and underlying me...

Status of mismatch repair genes hMSH2 and hMSH6 in colorectal cancer in Saudi patients: an immunohistochemical analysis.

This study aimed to identify the status of 2 major microsatellite instability markers (repair genes hMSH2 and hMSH6) in colorectal cancer cases operated at King Khalid University Hospital, Riyadh, Saudi Arabia between 2007 and 2009. Immunohistochemical study of microsatellite instability was done with antibodies to hMSH2 and hMSH6. A total of 32 blocks were analysed from patients aged 16-83 yea...

DNA mismatch repair genes and colorectal cancer.

Prognostic impact of mismatch repair genes germline defects in colorectal cancer patients: are all mutations equal?

BACKGROUND Lynch syndrome (LS) is the most common hereditary colorectal cancer (CRC) syndrome, caused by germline mutations in MisMatch Repair (MMR) genes, particularly in MLH1, MSH2 and MSH6. Patients with LS seem to have a more favourable prognosis than those with sporadic CRC, although the prognostic impact of different mutation types is unknown. Aim of our study is to compare survival outco...

Mismatch repair gene defects in sporadic colorectal cancer enhance immune surveillance.

BACKGROUND There is evidence that colorectal cancers (CRC) with DNA mismatch repair deficiency (MMR-D) are associated with a better prognosis than the generality of large bowel malignancies. Since an active immune surveillance process has been demonstrated to influence CRC outcome, we investigated whether MMR-D can enhance the immune response in CRC. PATIENTS AND METHODS A group of 113 consec...