On March 20, 2012, in a 9-0 decision, the U.S. Supreme Court issued its opinion in Mayo Collaborative Servs. v. Prometheus Labs. Inc., No. 10-1150, ruling that two patents covering medical diagnostics owned by Prometheus and asserted against Mayo were invalid, reversing the earlier ruling by the U.S. Court of Appeals for the Federal Circuit that the patents were valid and infringed.

The Supreme Court invalidated the patents covering a method for monitoring a patient’s blood to determine the best dosage for a drug—a decision that will likely adversely impact the personalized medicine industry—ruling that companies could not patent observations about a natural phenomenon. The case had been closely watched within the medical and biotechnology industries because of its impact on the growing and lucrative field of personalized medicine.

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