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New Indication Alert: Chugai/Zenyaku’s Rituximab Approved in Japan for Nephrotic Syndrome

Mar 27, 2025

On 27 March 2025, Chugai (a Roche subsidiary) and Zenyaku Kogyo announced that their co-marketed Rituxan® (rituximab) has been approved by the Japanese Ministry of Health, Labour and Welfare for “frequently relapsing or steroid-dependent nephrotic syndrome” in childhood (IV injection, 100mg and 500mg) that has not yet become intractable.

Rituxan® was approved in Japan in November 2024 for chronic idiopathic thrombocytopenic purpura (ITP) in children. Prior to this, Rituxan® had only been approved in Japan for chronic ITP in adults.

Rituximab was one of the first mAbs to become “biosimilar”.  Both Pfizer and Sandoz/Kyowa Kirin market rituximab biosimilars in Japan.  There are three rituximab biosimilars currently on the US market: Teva and Celltrion’s Truxima® (launched in May 2020), Pfizer’s Rituxience® (launched in January 2020) and Amgen and Allergan’s RiabniTM (approved by the FDA in December 2020).