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«A.Zalesov & Partners» achieved a decision to invalidate a Eurasian patent in full in the Russian Federation

15.08.2025
Aleksey Zalesov Patent Validity disputes Life Science Julia Dutikova

On August 04, 2025, the Board of the Chamber for Patent Disputes of Rospatent ruled to uphold the objection filed by the team of «A.Zalesov & Partners» and to invalidate Eurasian patent No. 034390 in full.

Eurasian Patent No. 034390 protected the use of a combination of known antibodies pertuzumab and trastuzumab in combination with chemotherapy, including docetaxel and carboplatin, for the neoadjuvant treatment of HER2-positive early-stage breast cancer. The term of this patent was extended based on the registration of the Fesgo medication (active components: Pertuzumab + Trastuzumab), which mentions in the instructions for medical use of the drug the possibility of its use in combination with chemotherapy.

The client was represented in the case by the Head of Intellectual property practice Aleksey Zalesov and Patent attorney Julia Dutikova.

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«A.Zalesov & Partners» achieved a decision to invalidate a Eurasian patent in full in the Russian Federation

The Board of the Chamber for Patent Disputes ruled in favor of the client of «A.Zalesov & Partners» in the case on opposition to the issuance of a patent for the use of pertuzumab in combination with trastuzumab and chemotherapy for the neoadjuvant treatment of HER2-positive early-stage breast cancer.

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Irina Ozolina commented on the Ruling and its significancy for the practice.

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