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  • Generic companies challenge Xtandi¡¯s patent in KOR
  • by Kim, Jin-Gu | translator Alice Kang | Aug 5, 2025 06:08am
An original prostate cancer drug
Alvogen Korea files patent avoidance trial against Astellas to invalidate Xtandi¡¯s composition patent
Alvogen received approval for its Xtandi generic in February this year... company is also developing Zytiga¡¯s generic version
Astellas' prostate cancer treatment ¡®Xtandi (enzalutamide)¡¯ has become the target of a patent challenge by a generic drug company.

According to industry sources on the 4th, Alvogen Korea recently filed a request for invalidation trial (passive scope confirmation trial) of the composition patent for Xtandi against Astellas. This is the first patent challenge ever filed against Xtandi in Korea.

Xtandi is Astellas' prostate cancer treatment. The drug is protected by two patents: a substance patent expiring in June 2026 and a composition patent expiring in September 2033.

Alvogen Korea plans to avoid the composition patent expiring in 2033 and launch a generic version in time for the expiration of the substan
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