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  • Expanded patent dispute over cancer drug 'Xtandi'
  • by Kim, Jin-Gu | translator Hong, Ji Yeon | Aug 20, 2025 06:22am
Major pharmaceutical companies have now joined
The number of companies challenging the composition patent for the prostate cancer treatment has expanded to six
 ¡ã Product photo of Xtandi
The number of companies challenging the patent for Astellas' prostate cancer treatment, 'Xtandi (enzalutamide)', has expanded to six. Attention has been drawn to the fact that major pharmaceutical companies, such as Chong Kun Dang, Hanmi Pharmaceutical, and JW Pharmaceutical, have joined this latest patent challenge.

According to the pharmaceutical industry on August 19, Hanmi Pharmaceutical filed a petition for trial to confirm the scope of rights against Astellas for Xtandi's composition patent on August 18.

As a result, the total number of companies that have filed circumvention trials against Xtandi's composition patent has increased to six. Earlier, Alvogen Korea was the first to file the trial on the 1st
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