Enzalutamide plus leuprolide achieves durable PSA suppression after treatment suspension
Dr Toni Choueiri speaks to ecancer about the phase 3 LITESPARK-022 study.
This trial evaluated pembrolizumab plus belzutifan as adjuvant therapy for patients with clear cell renal cell carcinoma at high risk of recurrence after nephrectomy.
The combination significantly improved disease-free survival compared with pembrolizumab alone, with higher two-year disease-free survival rates. Overall survival data are still maturing, but early trends favour the combination.
While higher rates of serious side effects were observed with the addition of belzutifan, particularly anaemia, liver enzyme elevations, and hypoxia, the overall safety profile remained consistent with known effects of each drug.
These findings suggest that pembrolizumab plus belzutifan may become a new standard adjuvant treatment option for patients with high-risk kidney cancer following surgery.
During GU ’26, ASCO GU, that occurred in February 2026 in San Francisco, we presented during an oral session the result of LITESPARK-022. In LITESPARK-022 we wanted to build on the success of adjuvant pembrolizumab, the first therapy to show an overall survival benefit in patients with kidney cancer at risk for recurrence. So in order to do that we have combined in the experimental arm, in this large study of more than 1,800 patients, we combined pembrolizumab with belzutifan. Belzutifan is an oral HIF-2 inhibitor, a new class of agent approved in metastatic kidney cancer patients who experience disease progression after PD-1 and VEGF inhibitor. So in a refractory population.
The combination resulted in a disease free survival advantage, that’s the primary endpoint, over pembrolizumab only: a 28% decrease in the risk of recurrence or death. The side effects overall were higher in patients with the combination, two drugs versus one drug, but overall what I can say, we did not have things we were not aware about. So hypoxia higher because that’s a side effect of belzutifan, as well as anaemia, which is a hallmark of HIF-2 inhibitors, if you want. We looked at specific subgroups that were prespecified and also the combination resulted in higher efficacy. There wasn’t a subgroup where we can say for sure these patients would not benefit.
In addition, we took an early look at overall survival, a key secondary endpoint. The hazard ratio was 0.78, too immature for the time being to look at and we will continue looking at.
The study follow-up is 28 months only so we can say that this is very possibly, maybe when approved and if approved, a new standard of care. It’s amazing to see pembrolizumab being built upon so fast by another positive study. So we’re very happy to provide this to patients when it’s available. It’s another shot at kidney cancer.
Enzalutamide plus leuprolide achieves durable PSA suppression after treatment suspension
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