Merrimack Reports Second Quarter 2023 Financial Results - Seite 2

• In August 2022, Ipsen announced that the Phase III RESILIENT trial did not meet its primary endpoint of overall survival compared to topotecan. The trial is evaluating Onivyde versus topotecan in patients with small cell lung cancer, who have progressed on or after platinum-based first-line therapy treatment. In the announcement, Ipsen indicated that detailed results from the RESILIENT trial would be presented at an upcoming medical conference. The analysis concluded that the primary endpoint overall survival was not met in patients treated with Onivyde versus topotecan. However, a doubling of the secondary endpoint of objective response rate in favor of Onivyde was observed. In the August 2022 announcement, Ipsen reported that the clinical study results would be communicated with the regulatory agency. Ipsen indicated that while the results from the analysis of the RESILIENT trial have not demonstrated an overall survival benefit with Onivyde in patients in second-line small cell lung cancer, Ipsen intends to analyze the data further before decisions regarding next steps are made.
• To date, there have been no further announcements by Ipsen regarding these matters and it remains unclear as to whether Ipsen will continue to seek approval for the use of Onivyde in the small cell lung cancer application. If Ipsen elects not to proceed with seeking regulatory approval, or if regulatory approval is not obtained, Merrimack would not be entitled to the $150 million milestone payment tied to FDA approval of Onivyde for treatment of small cell lung cancer.

Elevation Oncology

• In January 2023, Elevation announced it is pausing further investment in the clinical development of seribantumab and intends to pursue further development only in collaboration with a partner. If Elevation elects not to proceed with seeking regulatory approval, or if regulatory approval is not obtained, Merrimack would not be entitled to the $54.5 million in additional potential development, regulatory approval and commercial-based milestone payments.

About Merrimack

Merrimack Pharmaceuticals, Inc. is a biopharmaceutical company based in Cambridge, Massachusetts that is entitled to receive up to $450.0 million in contingent milestone payments related to its sale of ONIVYDE to Ipsen S.A. in April 2017. These milestone payments would be payable by Ipsen upon approval by the U.S. Food and Drug Administration (“FDA”) of ONIVYDE for certain additional clinical indications. ONIVYDE is already approved by the FDA in combination with fluorouracil (5-FU) and leucovorin (LV) for the treatment of patients with metastatic adenocarcinoma of the pancreas after disease progression following gemcitabine-based therapy. This existing approval is unrelated to any future potential milestone payments. Merrimack’s agreement with Ipsen does not require Ipsen to provide Merrimack with any information on the progress of ONIVYDE clinical trials that is not publicly available. Merrimack is also entitled to receive up to $54.5 million in contingent milestone payments related to its sale of anti-HER3 programs to Elevation Oncology (formerly 14ner Oncology, Inc.) in July 2019.