MSD:WELIREG®Belzutifan was approved for marketing in the United States.

Recently, Merck announced that the U.S. FDA has approved the combination regimen of its HIF-2α inhibitor Welireg (belzutifan) and PD-1 inhibitor Keytruda (pembrolizumab) as adjuvant therapy for adult patients with renal cell carcinoma (ccRCC) containing a clear cell component who are at increased risk of recurrence following nephrectomy. Merck stated in a press release that the Welireg plus Keytruda combination is the first regimen to demonstrate superior disease-free survival over Keytruda monotherapy in the adjuvant treatment of renal cell carcinoma, and has the potential to become a new standard of care.

RCC is a common type of kidney cancer, accounting for approximately 90% of all renal cancer diagnoses. Most RCC cases are incidentally detected during imaging for other abdominal conditions, with approximately 30% of patients already having advanced disease at the time of diagnosis. After initial treatment, approximately 40% of RCC patients may experience tumor recurrence.

Welireg (belzutifan) is an oral small-molecule hypoxia-inducible factor 2α (HIF-2α) inhibitor designed to reduce the transcription and expression of HIF-2α target genes associated with cell proliferation, angiogenesis, and tumor growth. The drug was originally developed by Peloton Therapeutics. In May 2019, Merck acquired Peloton for up to $2.2 billion, thereby obtaining belzutifan.

The FDA approval is primarily based on data from the LITESPARK-022 trial, a multicenter, randomized, double-blind Phase III clinical trial evaluating the efficacy of Welireg in combination with Keytruda versus Keytruda plus placebo in patients with clear cell renal cell carcinoma following nephrectomy. According to Merck’s disclosed data, at the first pre-specified interim analysis, the combination arm met the primary endpoint of significantly improved disease-free survival (DFS). Compared with Keytruda plus placebo, the Welireg plus Keytruda arm demonstrated a 28% reduction in the risk of disease recurrence or death. Median DFS was not reached in either arm, with estimated 24-month DFS rates of 81% and 74%, respectively. The trial will continue to evaluate overall survival (OS), a key secondary endpoint.

In the trial, 52.1% of patients receiving Welireg plus Keytruda experienced Grade ≥3 TEAEs, compared with 30.2% of patients receiving Keytruda plus placebo. The most common adverse events were anemia, elevated ALT, and hypoxia. The incidence of Grade 5 TEAEs and treatment-related adverse events (TRAEs) was similar between the two arms. No new safety signals were observed.

Merck stated in the press release that “this approval represents the first approval of Welireg in earlier-stage ccRCC and the first approval of a HIF-2α inhibitor combined with PD-1 therapy.”

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