×

Astellas collaborates with Vir to develop its experimental prostate cancer drug

By Thomson Reuters Feb 23, 2026 | 4:07 PM

Feb 23 (Reuters) – Japan’s Astellas and Vir Biotechnology said on Monday they will ​together develop and commercialize ‌the U.S. drug developer’s prostate cancer experimental drug.

Vir will receive $335 million in upfront and near-term ‌payments ​under the deal, ⁠including $240 million in ⁠cash, $75 million in equity investment at a 50% premium, and a near-term $20 million ​milestone, the companies said.

The company will also be ⁠eligible to receive ⁠up to $1.37 billion in ​milestone payments, plus double‑digit royalties ​on sales outside the United ‌States.

Astellas will lead the U.S. commercialization of VIR‑5500, and have the exclusive rights ⁠outside the country, with Vir retaining an option to co‑promote in ⁠the ‌U.S., the companies said.

VIR-5500 ⁠is in early ​Phase ‌1 testing as an ​experimental treatment ⁠for advanced metastatic prostate cancer.

(Reporting by Gnaneshwar Rajan in Bengaluru and Michael Erman in New York; Editing by ​Shinjini Ganguli)