Regorafenib Receives FDA Approval for Liver Cancer

Richard Pazdur, MD

Richard Pazdur, MD

Regorafenib (Stivarga) has been approved by the FDA as a second-line treatment for patients with unresectable hepatocellular carcinoma (HCC) who have previously received sorafenib (Nexavar).

The approval is based on the phase III RESORCE trial, in which the median overall survival (OS) was 10.6 months with regorafenib plus best supportive care compared with 7.8 months for placebo plus best supportive care, representing a 38% reduction in the risk of death (HR, 0.62; 95% CI, 0.50-0.78;P<.001).

Limited treatment options are available for patients with liver cancer,&rdquo; Richard Pazdur, MD, acting director of the Office of Hematology and Oncology Products in the FDA&rsquo;s Center for Drug Evaluation and Research and director of the FDA&rsquo;s Oncology Center of Excellence, said in a statement. &ldquo;This is the first time patients with HCC have had an FDA-approved treatment that can be used if their cancer has stopped responding to initial treatment with sorafenib.&rdquo;

The phase III RESORCE study randomized 573 patients with HCC in a 2:1 ratio to receive best supportive care plus either regorafenib (n = 379) or placebo (n = 194). Regorafenib was administered at 160 mg once daily for 3 weeks followed by 1 week without treatment.

The median age of patients was 63 years, with the majority being male (88%). Most patients had tumors that were BCLC stage C (87%). Prior sorafenib (Nexavar) was administered for &ge;20 days at &ge;400 mg/day with documented radiologic progression. The primary endpoint of the study was OS, with secondary outcome measures focused on progression-free survival (PFS), objective response rate (ORR), and safety.

Median PFS was 3.1 months in the regorafenib arm compared with 1.5 months in the placebo group, representing a 54% reduction in the risk of progression or death (HR, 0.46; 95% CI, 0.37-0.56;P<.001). The median time to progression in the regorafenib group was 3.2 versus 1.5 months with placebo (HR, 0.44; 95% CI, 0.036-0.55;&nbsp;P<.001).

The ORR with regorafenib was 10.6% versus 4.1% with placebo (P = .005). When considering stable disease, the overall disease control rate was 65.2% with the multikinase inhibitor versus 36.1% with placebo.

Median duration of treatment was 3.6 months with regorafenib (range, 0.03-29.4) versus 1.9 months with placebo (range, 0.2-27.4). Grade &ge;3 adverse events (AEs) were experienced by 79.7% of those treated with regorafenib versus 58.5% of patients in the placebo arm. Dose modifications to alleviate AEs were required for 68.2% of patients in the experimental arm compared with 31.1% of patients treated with placebo.

The most common grade &ge;3 AEs with regorafenib versus placebo, respectively, were hypertension (15.2% vs 4.7%), hand-foot skin reaction (12.6% vs 0.5%), fatigue (9.1% vs 4.7%), and diarrhea (3.2% vs 0%). There were more deaths in the placebo arm versus regorafenib within 30 days following the last dose of treatment (13.4% with regorafenib vs 19.7% for placebo).