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UrduThe results were presented at the annual European Society for Medical Oncology (ESMO) Congress on October 21, 2023, in Madrid, Spain.
“This is real progress for patients and could lead to approval of this drug for this patient group,” says Choueiri, senior author on the presentation in Madrid.
Belzutifan, a HIF-2α inhibitor, is currently approved for patients with Von Hippel-Landau (VHL) disease-associated renal cell carcinoma, a form of kidney cancer. The drug was originally investigated and approved for kidney cancer patients with VHL disease because they have inherited a mutation that inactivates the VHL gene, which results in an overabundance of HIF-2α in cells.
When overabundant in cells, HIF-2α is associated with increased cancer-driving activity, such as cell proliferation, immune evasion, low oxygen levels (called hypoxia), and blood vessel formation (called angiogenesis). Dana-Farber’s William G. Kaelin, Jr., MD, was awarded a Nobel Prize in Physiology or Medicine in 2019 for the discovery of the role HIF-2α in cancer and other diseases.
“The knowledge we have about hypoxia and angiogenesis in kidney cancer stemmed from this essential pre-clinical research at Dana-Farber,” says Choueiri. “Bringing this knowledge forward to benefit patients is very gratifying.”
While the mutation that causes VHL disease is inherited, spontaneous mutations that inactivate VHL occur in over 90% of ccRCC tumors, suggesting that a HIF-2α inhibitor might also benefit patients with ccRCC.
This trial, called LITESPARK-005, enrolled 746 patients with metastatic ccRCC who had progressed after treatment with both an immune checkpoint inhibitor (ICI), such as a PD-1 or PD-L1 inhibitor, and an anti-angiogenic therapy. ICIs and anti-angiogenic medicines have become a standard part of first- and second-line therapies for metastatic ccRCC, though most patients eventually experience disease progression and need additional treatment options.
Patients were randomized to receive treatment with either belzutifan or everolimus. At the second interim analysis, after a median of 25.7 months, patients taking belzutifan were 26% less likely to have progressed compared with those taking everolimus.
The overall response rate was also higher with belzutifan, at 22% versus 3.5%, and 13 patients experienced a complete response with belzutifan compared to none with everolimus. Patients taking belzutifan were also less likely to discontinue therapy due to side effects.
“Importantly, quality of life favored belzutifan,” says Choueiri.
There was an improvement in overall survival with belzutifan though it was not statistically significant.
This investigation of monotherapy with belzutifan is part of a broader strategy to learn more about the efficacy and safety of HIF-2α inhibition in RCC. The strategy involves multiple LITESPARK trials examining beluzutifan alone and in combination with other therapies in treatment-naive and pre-treated disease settings. Choueiri also presented updated findings from the phase 2 LITESPARK-003 at the ESMO Congress that showed belzutifan plus cabozantinib showed durable antitumor activity and a safety profile consistent with prior observation previously published in The Lancet Oncology.
Both trials are sponsored by Merck Sharp & Dohme LLC.
ESMO Session Details
LBA 87: Phase 2 LITESPARK-003 Study of belzutifan in combination with cabozantinib for advanced clear cell renal cell carcinoma (ccRCC) will be presented in Proffered Paper Session 2 – Genitourinary tumors, non-prostate on Saturday, October 21, 2023, at 8:45am ET (14:45 CEST) Toni K. Choueiri, MD/First Author
LBA 88: Belzutifan versus everolimus in participants (pts) with previously treated advanced clear cell renal cell carcinoma (ccRCC): randomized open-label phase 3 LITESPARK-005 study will be presented in Proffered Paper Session 2- Genitourinary tumors, non-prostate on Saturday, October 21, 2023, at 8:55am ET (14:55 CEST) Toni K. Choueiri, MD/Senior Author
About Dana-Farber Cancer Institute
Dana-Farber Cancer Institute is one of the world’s leading centers of cancer research and treatment. Dana-Farber’s mission is to reduce the burden of cancer through scientific inquiry, clinical care, education, community engagement, and advocacy. Dana-Farber is a federally designated Comprehensive Cancer Center and a teaching affiliate of Harvard Medical School.
We provide the latest treatments in cancer for adults through Dana-Farber Brigham Cancer Center and for children through Dana-Farber/Boston Children’s Cancer and Blood Disorders Center. Dana-Farber is the only hospital nationwide with a top 5 U.S. News & World Report Best Cancer Hospital ranking in both adult and pediatric care.
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