Oncoinvent ASA: Invitation to business update Wednesday 29 April 2026

Oslo, Norway, 23 April 2026 - Oncoinvent ASA (ONCIN), a biotech company
developing a receptor-independent alpha radiopharmaceutical to eradicate cancer
cells in the abdominal cavity after surgery with a single, targeted dose, is
pleased to invite investors, analysts, and stakeholders to a live webcast event
at 8:00 AM CET on Wednesday, 29 April 2026.

Webcast:

  · Date: Wednesday, 29 April 2026
  · Time: 8:00am CET
  · Webcast link: click here for link (https://qcnl.tv/p/ZTQdC_4834AF6CKrux8XCw)

The presentation will on the same day be made available on the Investor
Relations section of the Company's website at www.oncoinvent.com. A recording of
the webcast will be made available after the live sending.

Oncoinvent reports its financial results on a half-yearly basis, complemented by
quarterly business updates to keep investors, analysts, and stakeholders
informed and ensure ongoing transparency.

For further information, please contact:

Oystein Soug, Chief Executive Officer
Email: IR@oncoinvent.com (soug@oncoinvent.com)

This information is subject to the disclosure requirements pursuant to Euronext
Oslo Rule Book II for companies listed on Oslo Børs and Section 5-12 of the
Norwegian Securities Trading Act.

About Oncoinvent

Oncoinvent is developing Radspherin[®], a receptor-independent alpha radiation
therapy that leverages the unique anatomy of the abdominal cavity to destroy
residual micrometastases using a single, highly localized dose of alpha
radiation. The initial clinical focus is treatment of ovarian and colorectal
cancer patients after surgical removal of the primary tumor and visible
metastases in the peritoneum, the thin membrane lining the abdominal cavity and
covering the abdominal organs.

This radiopharmaceutical is designed to prevent or delay recurrence in the
peritoneal cavity, keeping patients disease-free for longer than the current
standard of care and thereby also impacting overall survival. It is broadly
applicable to any cancer that spreads to the peritoneum, e.g. ovarian,
colorectal, and gastric cancers. Radspherin[®] stands out for its simplicity,
excellent safety profile, and seamless integration into existing surgical
workflows. Oncoinvent's product is easy to use, avoids systemic delivery and
significant toxicity. It is also differentiated in being simple to manufacture,
scalable, and supply de-risked.

Data from two trials in ovarian (phase 1) and colorectal (phase 1/2a) cancers,
are highly promising, showing an excellent safety profile and meaningful signals
of efficacy. Interim data from an ongoing, randomized, controlled phase 2
ovarian cancer trial is expected in 2026. With cost-effective manufacturing,
blockbuster potential, active pharma partnership momentum, plus strong
endorsements from leading experts, Oncoinvent is built for scale and commercial
success, and is set to become the new standard for post-surgical cancer care.
The Company was founded by the originators of Algeta and Xofigo (acquired by
Bayer).