Microsatellite instability analysis in uterine cavity washings as a screening tool for endometrial cancer in Lynch syndrome.

Although patients with Lynch syndrome (LS) are at high risk of endometrial cancer, gynecologic screening has been poorly investigated and diagnostic value of current screening tests remains unclear. Microsatellite instability (MSI) phenotype is found in more than 90% of endometrial cancers developed in LS patients. Here we report the first two cases of unstable endometrial tumors with detection of MSI in uterine cavity washings cells. This new technique may be a promising screening tool in LS.