A federal judge has invalidated four patents on genetic tests to be used in cancer treatment belonging to a Laboratory Corporation of America Holdings unit, finding they claimed unpatentable laws of nature.

The ruling, handed down Wednesday by U.S. District Judge Allison Burroughs in Boston, is a victory for German diagnostics company Qiagen NV, which had challenged the patents. It follows an order from Burroughs in the same case last September invalidating a similar patent on the same grounds.

The dispute goes back to 2014, when Esoterix Genetic Laboratories Inc, a subsidiary of North Carolina diagnostics company LabCorp, sued Qiagen in the U.S. District Court for the District of Massachusetts in 2014. Rob Baron, Marc Segal, Scott Marty, Tom Hazlett, and Tyler Marandola of Ballard Spahr represent Qiagen.