Appropriate for all patients?
Llovet told Medscape Medical News that the combination of atezolizumab and bevacizumab, although still awaiting approval for use in liver cancer, will be adopted by guidelines in the management of HCC as first-line therapy.
It has been accepted as the new front-line standard of care in a soon-to-be-published consensus on trial design and endpoints in HCC that he has authored.
Llovet said that the intravenous (IV) dosing of the combination was not likely to be a problem (sorafenib is administered orally). For patients with untreated advanced HCC, median survival is 8 months; it is 11-13 months with sorafenib. With this combination, the median was not reached, but it is expected to be beyond 17 months. “In this scenario, IV versus oral dosing will only have implications if the treatments had similar efficacy but not significantly better performance,” he said.
In her editorial, Kelley suggests caution when considering use of the combination in a patient population broader than that defined by the IMbrave150 study.
She points out that patients in IMbrave150 were required to have well-compensated liver disease (Child-Pugh class A liver function), and patients with untreated or incompletely treated esophageal or gastric varices with bleeding or those who were at high risk of bleeding were excluded from the study.
“Safety has not been established for persons in the Childs-Pugh class B population, and alternative therapies should be considered for patients at high risk for bleeding,” Kelley writes in her editorial.
Bleeding events, including fatal bleeding and perforated ulcers, “underscore important considerations for the application of the atezolizumab-bevacizumab regimen to a broader population beyond the clinical trial setting,” Kelley noted.
She recommends that all patients at risk for varices undergo “appropriate endoscopic evaluation and management before treatment is initiated.”
Llovet agreed and noted that upper endoscopy is not currently practiced in the management of advanced HCC. “One important issue in the clinical practice will be that all patients require an upper endoscopy to rule out esophageal varices, which are at risk of bleeding with bevacizumab,” he said.
Trial investigator Finn explained that IMbrave 150 is not unique and that every phase 3 study has included patients with Child-Pugh class A liver function.
“Patients with Child-Pugh class B are a heterogeneous group of patients,” Finn said. Physicians should use their judgment in providing this combination to patients with Child-Pugh scores of 7–9, he added. “All patients with advanced liver cancer need an endoscopy,” Finn said.
Kelley and Llovet also observed that several ongoing trials, some of which have been completed, are evaluating combinations of immunotherapy and other antiangiogenic agents or combinations of immunotherapies. The results from these trials will inform how such combinations will be used in the future.
Kelley predicted that, if some of these trials are positive, in the absence of a predictive biomarker, physicians will be guided by “the safety profiles of the combinations as well as the inference of synergy on the basis of depth and durability of responses.”
“Results of these trials will be known within the next 12-18 months and might further improve the current standards for patients with inoperable HCC,” Llovet said.
IMbrave150 was sponsored by F. Hoffmann–La Roche/Genentech. Finn has consulted for AtraZeneca, Bayer, Bristol-Myers Squibb, CStone, Eisai, Eli Lilly, Exelixis, Roche, Genentech, Merck & Co, Novartis, and Pfizer. Finn’s coauthors also report relationships with pharmaceutical companies. Kelley reports institutional research support from many pharmaceutical companies and served on the independent data monitoring committee for the IMbrave150 trial. Llovet has received research support from Bayer HealthCare Pharmaceuticals, Eisai, Bristol-Myers Squibb, Boehringer Ingelheim, and Ipsen and consulting fees from Bayer HealthCare Pharmaceuticals, Merck, Eisai Inc, Bristol-Myers Squibb, Celsion Corporation, Eli Lilly, Roche, Genentech, Glycotest, Nucleix, Can-Fite Biopharma, AstraZeneca, and Exelixis.
This article first appeared on Medscape.com.