Bristol Myers filed a lawsuit Monday claiming AstraZeneca has infringed on a patent related to its Yervoy cancer drug. The pharmaceutical company launched the suit in the United States District Court for the District of Delaware. Bristol Myers claimed AstraZeneca’s Imjudo cancer treatment infringes on its patent and that AstraZeneca failed to first obtain a license or permission. The cancer treatment in question is known as cancer immunotherapy, which according to the lawsuit “represents a scientific breakthrough that has revolutionized cancer treatment by manipulating a patient’s immune system to eliminate cancer cells.” Yervoy has been approved by the U.S. Food and Drug Administration (FDA) to treat melanoma, renal cell carcinoma, colorectal cancer, hepatocellular carcinoma, non-small cell lung cancer (NSCLC), malignant pleural mesothelioma, and esophageal cancer, either alone or in combination with the company’s drug, Opdivo.

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