STOCKHOLM – September 21, 2026 – Oncopeptides AB (publ) (Nasdaq Stockholm: ONCO), a biotech company focused on difficult-to-treat cancers, today announces its participation in the 23rd International Myeloma Society (IMS) Annual Meeting, taking place in Glasgow, Scotland, from September 23–26, 2026.

As the defining annual gathering in the myeloma field, the IMS congress provides an important platform for Oncopeptides to showcase significant corporate and clinical momentum achieved over the past year. Since the society's meeting last year, Oncopeptides has advanced across multiple fronts—accelerating commercial execution in Europe, expanding regional distribution through strategic partnerships, strengthening clinical evidence for Pepaxti (melflufen), and broadened the scope of its proprietary Peptide-Drug Conjugate (PDC) platform into new therapeutic indications such as glioblastoma.

For the congress, a poster evaluation titled: "Impact of prior Daratumumab or Isatuximab: an analysis of relapsed and refractory multiple myeloma (RRMM) patients treated with melflufen plus dexamethasone in the OP-106 HORIZON study" has been accepted. Led by prominent international investigators, the analysis explores clinical outcomes among heavily pretreated patients stratified by prior anti-CD38 monoclonal antibody exposure, offering further hypothesis-generating insights into treatment sequencing in modern clinical practice.

"As we return for the annual IMS congress, our real-world evidence programs are maturing, and our scientific understanding of PDCs continues to deepen," says Stefan Norin, Chief Medical Officer at Oncopeptides. " Our presence in Glasgow allows us to engage directly with the global myeloma community and share how Pepaxti continues to offer a vital, differentiated treatment option for patients with high unmet medical needs who have exhausted other alternatives."

Please visit the IMS website to view the poster. For more information on Oncopeptides' ongoing clinical programs, please visit www.oncopeptides.com.

For more information, please contact:
David Augustsson, Director of IR and Communications, Oncopeptides AB (publ)
E-mail: ir@oncopeptides.com
Cell phone: +46 76 229 38 68

About Oncopeptides
Oncopeptides is a Swedish biotech company focusing on research, development and commercialization of targeted therapies for difficult-to-treat cancers. 

The company uses its proprietary Peptide Drug Conjugate platform (PDC) to develop compounds that rapidly and selectively deliver cytotoxic agents into cancer cells. Its flagship drug is currently being commercialized in Europe with partnership agreements for South Korea, the Middle East and Africa and elsewhere.

Oncopeptides is also developing several new compounds based on its two proprietary technology platforms PDC and SPiKE.

The company was founded in 2000, has about 70 employees with operations in Sweden, Germany, Austria, Spain and Italy. Oncopeptides is listed on Nasdaq Stockholm with the ticker ONCO.

For more information see: www.oncopeptides.com

About Pepaxti
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.

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