FoundationOne®CDx (F1CDx) is a laboratory test designed to detect genetic variations in 324 genes in addition to select gene rearrangements and other biomarkers, such as tumor mutational burden (TMB), in the genomic makeup of a tumor. F1CDx is a companion diagnostic that was originally approved for the detection of genetic mutations in patients who may benefit from one of fifteen FDA-approved therapies for non-small cell lung cancer, melanoma, breast cancer, colorectal cancer, and ovarian cancer. This approval expands the indications for use of the F1CDx test to include solid tumor patients who have high tumor mutational burden (TMB). The TMB score comes from finding the number of mutations per megabase (length of a genome segment) in the tumor DNA. Identifying tumors with high levels of TMB will help patients with solid tumors get personalized treatment with KEYTRUDA® (pembrolizumab).
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