Patent No. EP3589661 (titled "Adjuvant Treatment Of Her2-Positive Breast Cancer") was filed by F Hoffmann LA Roche on Feb 28, 2018. The application was issued on Nov 1, 2023.
Combination therapy for HER2-positive breast cancer that extends survival compared to trastuzumab alone. The treatment combines pertuzumab with trastuzumab and chemotherapy, administered after breast surgery. The combination provides enhanced anti-tumor activity against HER2-positive breast cancer while addressing potential resistance mechanisms.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| MICHALSKI HUTTERAMNN & PARTNER PATENTANWALTE MBB | Aug 1, 2024 | - |
| ABEL & IMRAY | Jul 31, 2024 | - |
| LANYON OPPOSITIONS | Jul 31, 2024 | PINSENT MASONS |
| BRAND MURRAY FULLER | Jul 23, 2024 | BRAND MURRAY FULLER |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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