AstraZeneca has sued a handful of drug companies to protect its cancer treatment drug, Lynparza. The suits, which were filed by attorneys with Gibbons and Williams & Connolly, seek to protect the drug from four pharmaceutical competitors: Cipla Limited, Sandoz Inc., Natco Pharma Limited, and Zydus Pharmaceuticals.

Takeaway: These suits are the latest in a steady stream of cases filed by pharmaceutical companies alleging patent infringement and intellectual property claims.