Oncopeptides

Board/Management Information • Jan 11, 2023

Stockholm, Sweden Press release January 11, 2023

Oncopeptides appoints Holger Lembrer as Chief Financial Officer

STOCKHOLM — January 11, 2023 — Oncopeptides AB (publ.) (Nasdaq Stockholm: ONCO), a biotech company focused on research and development of therapies for difficult-to-treat hematological diseases, today announces that the Company has appointed Holger Lembrer as Chief Financial Officer, CFO. Prior to joining Oncopeptides Holger Lembrer was Business Unit CFO at Assa Abloy, and before that Investor Relations Officer, and Financial Controller. He has also been a Senior Auditor at Ernst & Young. Holger Lembrer will assume his new position before the end of February 2023 and will replace Annika Muskantor who has been interim CFO since November 1, 2021.

"I am very pleased that Holger Lembrer has decided to join Oncopeptides, and really look forward to working together with him," says Monica Shaw, CEO of Oncopeptides. "His combined expertise from leading financial roles, in a highly recognized, publicly traded, international Company, will be a great asset for Oncopeptides and its Leadership Team."

For more information, please contact:

Rolf Gulliksen, Global Head of Corporate Communications, Oncopeptides AB (publ.) E-mail: rolf.gulliksen@oncopeptides.com Cell phone: + 46 70 262 96 28

The information was submitted for publication, through the agency of the contact person above on January 11, 2023, at 13:30 (CET).

About Oncopeptides

Oncopeptides is a global biotech company focused on research and development of therapies for difficult-to-treat hematological diseases. The company uses its proprietary Peptide Drug Candidate platform, PDC, to develop compounds that rapidly and selectively deliver cytotoxic agents into cancer cells.

Pepaxti® (melphalan flufenamide, also called melflufen) has been granted Marketing Authorization, in the European Union, the EEA-countries Iceland, Lichtenstein and Norway, as well as in the UK. Pepaxti is indicated in combination with dexamethasone for the treatment of adult patients with multiple myeloma who have received at least three prior lines of therapies, whose disease is refractory to at least one proteasome inhibitor, one immunomodulatory agent, and one anti-CD38 monoclonal antibody, and who have demonstrated disease progression on or after the last therapy. For patients with a prior autologous stem cell transplantation, the time to progression should be at least 3 years from transplantation. Melflufen has been granted accelerated approval in the US under the trade name Pepaxto® . The drug is currently not marketed in the US. On December 7, 2022, the FDA recommended that the Company voluntarily withdraw the US marketing authorization for Pepaxto.

Oncopeptides is developing several new compounds based on its proprietary technology platforms and is listed on the Small Cap segment on Nasdaq Stockholm with the ticker ONCO. For more information see: www.oncopeptides.com.