Primary Progressive Disease Rate Supports IO/TKI Use in Frontline mRCC

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Commentary
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Alan Tan, MD, discusses factors influencing the choice of immunotherapy plus tyrosine kinase inhibitor vs dual IO in patients with metastatic renal cell carcinoma.

Alan Tan, MD, assistant professor of Medicine in the division of hematology and oncology at Vanderbilt University Medical Center, discusses factors influencing the choice of IO (immunotherapy) plus tyrosine kinase inhibitor (TKI) vs dual IO in patients with metastatic renal cell carcinoma (mRCC).

A major downside of dual IO in this setting is that the rate of primary progressive disease (PD) in the CheckMate 214 trial (NCT02231749) of nivolumab (Opdivo) plus ipilimumab (Yervoy) was 18% compared with lower PD rates in the CheckMate 9ER trial of cabozantinib (Cabometyx) plus nivolumab and the CLEAR trial of lenvatinib (Lenvima) plus pembrolizumab (Keytruda). In patients who need a rapid response, such as those with bulky disease or high-risk symptoms, IO/TKI might be preferred, Tan said.

Tan added that the IO/TKI regimens may be more similar than different and oncologists who have more expertise in one can serve their patients in managing it.

In a Case-Based Roundtable event he moderated, Tan and other oncologists generally agreed that a major reason they still consider dual IO instead is a better chance at durable remission, because quality of life and indefinite time off treatment are important to patients.

TRANSCRIPTION

0:10 | The downside from IO/IO is that you have primary progressive disease rate of 18% and then you have much lower primary progressive disease rate with IO/TKI, specifically, you know, in the CheckMate 9ER, you have primary PD rate of anywhere from 5% to 7% and then same with the CLEAR trial as well. When you need patients to have a rapid response—we talked about scenarios of when patients would need more rapid debulking—when they're higher in symptom scores, and things like pleural effusion, ascites, hypercalcemia, we touched it based on a lot of these things.

0:57 | But ultimately, between the IO/TKI combinations, I think there's more similarities than differences here. I think we're achieving relatively similar comparable overall response rates, and we're also showing that PFS and OS are probably very comparable as well. I think amongst the 3 IO/TKI trials, there may be some differences in the IMDC distributions. The CLEAR trial had a little bit more [favorable] risk and less poor risk.

1:32 | So I think we all take into consideration all of these factors when we interpret the data, but ultimately you can even apply the principle with IO/TKI as, choose one and do it well. Just become an expert at your favorite one, and I think you're not really doing the patient that you're treating a disservice with that.

But ultimately…most of us at least agree that trying to give the patient that one opportunity to have that durable, complete response or partial response that lasts a long time or maybe indefinitely, is really important, because what do patients really value? That's the chance for a cure, a chance to actually have a good quality of life off treatment for extended period of time.

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