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  • Merck Welireg receives...

Merck Welireg receives European Commission nod for two indications

Written By : Ruchika Sharma |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2025-02-19T10:30:20+05:30  |  Updated On 19 Feb 2025 10:30 AM IST
Merck bags USFDA nod for Welireg for 12 years and older with pheochromocytoma or paraganglioma
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Rahway: Merck, known as MSD outside of the United States and Canada, has received conditional approval from the European Commission (EC) for WELIREG (belzutifan), Merck’s oral hypoxia-inducible factor-2 alpha (HIF-2α) inhibitor, as monotherapy for:

  • The treatment of adult patients with von Hippel-Lindau (VHL) who require therapy for associated, localized renal cell carcinoma (RCC), central nervous system (CNS) hemangioblastomas, or pancreatic neuroendocrine tumors (pNET), and for whom localized procedures are unsuitable;
  • The treatment of adult patients with advanced clear cell RCC that progressed following two or more lines of therapy that included a programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor and at least two vascular endothelial growth factor (VEGF) targeted therapies.

The EC approval of these two indications is based on results from the LITESPARK-004 and LITESPARK-005 trials, respectively, and follows the positive recommendation from the Committee for Medicinal Products for Human Use adopted in December 2024. This marks the first approval for WELIREG in the European Union (EU). WELIREG is now approved in over 30 countries for certain adult patients with previously treated advanced RCC and in more than 40 countries for adult patients with certain eligible VHL disease-associated tumors.

“The approval of WELIREG in the EU introduces the first and only systemic treatment option for adult patients with certain VHL disease-associated tumors for whom localized procedures are unsuitable, and offers a new option for adult patients with advanced clear cell renal cell carcinoma that progressed following a PD-1 or PD-L1 inhibitor and at least two VEGF targeted therapies,” said Dr. Marjorie Green, senior vice president and head of oncology, global clinical development, Merck Research Laboratories. “This is an important moment, and we are pleased that WELIREG, a first-in-class HIF-2α inhibitor, can now potentially help these patients in need.”

This approval allows marketing of WELIREG for these indications in all 27 EU member states, as well as Iceland, Liechtenstein and Norway. The conditional approval of WELIREG will be valid for one year, subject to yearly renewal, pending additional clinical data from LITESPARK-004 and another ongoing Phase 2 trial of WELIREG in patients with certain VHL disease-associated tumors. Timing for commercial availability of WELIREG in individual EU countries will depend on multiple factors, including the completion of national reimbursement procedures.

Results in Patients With Certain Eligible VHL Disease-associated Tumors (LITESPARK-004)

WELIREG is now the first and only systemic therapy for the treatment of VHL disease-associated tumors in the EU. The approval in adult patients with certain eligible VHL disease-associated tumors is based on objective response rate (ORR) and duration of response (DOR) results from the LITESPARK-004 trial.

WELIREG was approved in the U.S. in August 2021 for the treatment of adult patients with VHL disease who require therapy for associated RCC, CNS hemangioblastomas or pNET not requiring immediate surgery based on the results from LITESPARK-004. In patients with VHL disease-associated RCC (n=61), WELIREG showed an ORR of 49% (95% CI, 36-62) (n=30/61); all responses were partial responses (PR). Median DOR for these patients was not reached, with ongoing responses ranging from 2.8+ to 22+ months; among responders, 56% (n=17/30) maintained a response for at least 12 months. Among these 61 patients, the study also evaluated response rates in other common disease-associated tumors including CNS hemangioblastomas and pNET. In patients with VHL disease-associated CNS hemangioblastomas (n=24) in this trial, WELIREG showed an ORR of 63% (95% CI, 41-81) (n=15/24), with a complete response (CR) rate of 4% (n=1/24) and a PR rate of 58% (n=14/24). Median DOR for these patients was not reached, with ongoing responses ranging from 3.7+ to 22+ months; among responders, 73% (n=11/15) maintained a response for at least 12 months. In patients with VHL disease-associated pNET (n=12) in this trial, WELIREG showed an ORR of 83% (95% CI, 52-98) (n=10/12), with a CR rate of 17% (n=2/12) and a PR rate of 67% (n=8/12). Median DOR for these patients was not reached, with ongoing responses ranging from 11+ to 19+ months; among responders, 50% (n=5/10) maintained a response for at least 12 months.

Results in Certain Patients With Previously Treated Advanced RCC (LITESPARK-005)

The approval in adult patients with advanced clear cell RCC that progressed following two or more lines of therapy, including a PD-1 or PD-L1 inhibitor and at least two VEGF targeted therapies, is based on progression-free survival (PFS) and ORR results from the LITESPARK-005 trial, which was the first trial in advanced RCC to specifically evaluate patients who progressed following these treatments.

WELIREG was approved in the U.S. in December 2023 for the treatment of adult patients with advanced RCC following both a PD-1 or PD-L1 inhibitor and a VEGF-tyrosine kinase inhibitor based on the results from LITESPARK-005. In the trial, WELIREG reduced the risk of disease progression or death by 25% (HR=0.75 [95% CI, 0.63-0.90]; p=0.0008) versus everolimus. Median PFS was 5.6 months (95% CI, 3.9-7.0) for WELIREG versus 5.6 months (95% CI, 4.8-5.8) for everolimus. The ORR for WELIREG was 22% (n=82) (95% CI, 18-27), with a CR rate of 3% (n=10) and a PR rate of 19% (n=72), and the ORR for everolimus was 4% (n=13) (95% CI, 2-6), with no patients achieving a CR and a PR rate of 4% (n=13).

merckmerck newseuropean commissionweliregbelzutifanvon Hippel Lindau diseaserenal cell carcinoma
Ruchika Sharma
Ruchika Sharma

    Ruchika Sharma joined Medical Dialogue as an Correspondent for the Business Section in 2019. She covers all the updates in the Pharmaceutical field, Policy, Insurance, Business Healthcare, Medical News, Health News, Pharma News, Healthcare and Investment. She has completed her B.Com from Delhi University and then pursued postgraduation in M.Com. She can be contacted at editorial@medicaldialogues.in Contact no. 011-43720751

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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