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The approval is supported by a randomized trial showing that pembrolizumab nearly doubled progression-free survival compared to the standard chemotherapy regimen.
More than 40 percent of women with advanced mismatch repair-deficient endometrial cancer had an objective response to GSK's anti-PD-1 monoclonal antibody.
The groups have written draft recommendations and are now asking for public comment from pathologists and other stakeholders.
A new study suggests that colorectal cancers increase their mutation rate to dodge treatment in a manner that mirrors microbial resistance mechanisms.
Investigators pooled older and new data from the Prospective Lynch Syndrome Database, tracking outcomes for different mutations across age and gender groups.
Mismatch repair-deficient tumors with many insertion-deletion mutations and enhanced microsatellite instability responded better to anti-PD-1 immunotherapy.
Researchers separately found that the assay had high concordance with other techniques in cancers including colorectal and endometrial carcinomas.
During the meeting, researchers presented studies on combination immunotherapies and the efficacy of giving molecularly-informed treatments earlier in the disease continuum.
In a pan-cancer analysis, Lynch syndrome genes were mutated more often than anticipated in tumors with high or intermediate levels of microsatellite instability.
The updated recommendations discuss testing for DNA repair gene mutations, MSI-H, and dMMR, as well as germline testing and counseling.