A companion diagnostic (CDx) is a term used to describe an in vitro assay using advanced molecular or omics technologies that are developed alongside a specific drug to identify patients who are most likely to benefit from that drug. This concept of CDx has been the cornerstone of Precision Medicine- an approach that leverages a patient’s genetic and phenotypic profile to develop tailored therapeutic strategies with maximum safety and efficacy, and minimum risk of adverse reactions or side effects.
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