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Authors Ramaprasad Srinivasan, Frede Donskov, Othon Iliopoulos, Wendy Kimryn Rathmell, Vivek Narayan, Benjamin L. Maughan, Stephane Oudard, Tobias Else, Jodi K. Maranchie, Sarah Joanne Welsh, Ananya Roy, Yanfang Liu, Rodolfo F. Perini, W. Marston Linehan, Eric Jonasch
Title Phase 2 study of belzutifan (MK-6482), an oral hypoxia-inducible factor 2α (HIF-2α) inhibitor, for Von Hippel-Lindau (VHL) disease-associated clear cell renal cell carcinoma (ccRCC).
Journal Journal of Clinical Oncology
Vol 39
Issue no. 15_suppl
Date May 20, 2021
URL https://ascopubs.org/doi/abs/10.1200/JCO.2021.39.15_suppl.4555
Abstract Text Background: Inactivation of VHL leads to aberrant stabilization and accumulation of HIF-2α, which drives tumor growth. Patients (pts) with VHL disease are at risk for ccRCC, pancreatic neuroendocrine tumors (pNETs), and hemangioblastomas. Repeated surgeries are often needed to control ccRCC and other VHL disease manifestations. Prior results of this ongoing open-label phase 2 study (NCT03401788) showed activity with belzutifan in VHL disease. Updated results are presented. Methods: Adults with germline VHL alterations, measurable and localized/nonmetastatic ccRCC, no prior systemic anticancer therapy, and ECOG PS 0 or 1 received belzutifan 120 mg once daily until progression, intolerable toxicity, or decision to withdraw. The primary end point is ORR of VHL-associated ccRCC tumors per RECIST v1.1 by independent review committee (IRC). Secondary end points include DOR, time to response (TTR), PFS, and safety. Results: As of June 1, 2020, 61 pts enrolled. Most pts (82%) had ECOG PS 0, and the median number of prior tumor reduction procedures (eg, partial nephrectomy, craniotomy, radiation therapy) per pt was 5 (range, 0-15). Lesions outside the kidney (non-RCC tumors) evaluable by IRC included pNETs (33%) and CNS hemangioblastomas (82%). Median follow-up was 69 wk (range, 18-105), median duration of treatment was 68 wk (range, 8-105), and 56 pts (92%) remain on therapy. There were 22 confirmed responses (ORR, 36% [95% CI, 24-49]) and 7 (11%) unconfirmed responses (documented at 1 time point, to be confirmed at subsequent time point); all were PRs. In pts with confirmed PR, median DOR was not reached (range, 12+ to 62+ wk), median TTR was 31 wk (range, 12-61), and 56 pts (92%) had some reduction in the sum of all target lesion diameters. PFS rate at 52 wk was 98% (95% CI, 89-100). For non-RCC tumors, ORR was 80% (16/20; 1 CR) in pNETs and 32% (16/50; 1 CR) in CNS hemangioblastomas. Of 16 pts with evaluable retinal hemangioblastomas at baseline, 11 (69%) showed improvement per IRC. In those 16 pts, 29 eyes were monitored for retinal hemangioblastomas: 16 eyes (55%) showed improvement, 12 (41%) were stable, and no evaluation was available for 1 eye (3%). All 61 pts (100%) had at least one AE. The most common all-cause AE was anemia (90%), which is considered an on-target toxicity. Treatment-related AEs (TRAE) were reported by 60 pts (98%), and 8 pts (13%) had a grade 3 TRAE. No pts had grade 4/5 TRAEs. One pt discontinued treatment because of a TRAE (grade 1 dizziness). Conclusions: Belzutifan demonstrates clinical benefit and has a favorable safety profile in patients with VHL disease–associated ccRCC, pNETs, and hemangioblastomas. Clinical trial information: NCT03401788.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
VHL inact mut hemangioblastoma sensitive Belzutifan FDA approved Actionable In a Phase II trial that supported FDA approval, Welireg (belzutifan) treatment was safe and resulted in an overall response rate of 32% (16/50, 1 complete response, 15 partial responses) in patients with Von Hippel-Lindau disease-associated CNS hemangioblastoma harboring germline VHL mutations, 69% (11/16) of patients with retinal hemangioblastoma experienced improvement (J Clin Oncol 39, no. 15_suppl (May 20, 2021) 4555-4555; NCT03401788). detail...
VHL inact mut renal cell carcinoma sensitive Belzutifan FDA approved Actionable In a Phase II trial that supported FDA approval, Welireg (belzutifan) treatment was safe and resulted in a confirmed partial response (PR) in 36% (22/61) and unconfirmed PR in 11% (7/61) of patients with Von Hippel-Lindau disease-associated localized renal cell carcinoma harboring germline VHL mutations, median duration of response was not reached in responders (J Clin Oncol 39, no. 15_suppl (May 20, 2021) 4555-4555; NCT03401788). detail... detail...
VHL inact mut retinal hemangioblastoma sensitive Belzutifan Phase II Actionable In a Phase II trial, Welireg (belzutifan) treatment was safe and resulted in an overall response rate of 32% (16/50, 1 complete response, 15 partial responses) in patients with Von Hippel-Lindau disease-associated CNS hemangioblastoma harboring germline VHL mutations, 69% (11/16) of patients with retinal hemangioblastoma experienced improvement (J Clin Oncol 39, no. 15_suppl (May 20, 2021) 4555-4555; NCT03401788). detail...
VHL inact mut pancreatic endocrine carcinoma sensitive Belzutifan FDA approved Actionable In a Phase II trial that supported FDA approval, Welireg (belzutifan) treatment was safe and resulted in an overall response rate of 80% (16/20, 1 complete response, 15 partial responses) in patients with Von Hippel-Lindau disease-associated pancreatic neuroendocrine tumors harboring germline VHL mutations (J Clin Oncol 39, no. 15_suppl (May 20, 2021) 4555-4555; NCT03401788). detail... detail...