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Regorafenib as Single Agent in Patients With Metastatic Colorectal Cancer (mCRC) With Any RAS or BRAF Mutation Previously Treated With FOLFOXIRI Plus Bevacizumab

ABSTRACT: The purpose of this study is to assess the efficacy of single-agent regorafenib in the second-line treatment in metastatic colorectal cancer with any RAS or BRAF mutation previously treated with FOLFOXIRI plus bevacizumab in terms of progression-free survival at 6 months.

DISEASE(S): Metastatic Colorectal Cancer,Neoplasm Metastasis,Cancer Colorectal Metastásico,Metastatic Disease,Colorectal Neoplasms

PROVIDER: 2169449 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Project description:LESSONS LEARNED:RAS- or BRAF-mutated metastatic colorectal cancers (mCRCs) progressing after first-line treatment have a poor prognosis.European and U.S. guidelines include the multikinase inhibitor regorafenib as a standard option for second-line therapy and beyond, based on the results of the randomized phase III CORRECT trial demonstrating improvement in survival.Although stopped prematurely for failing to accrue, the PREVIUM trial, the first prospective interventional study exploring regorafenib as second-line treatment for patients with mCRC bearing RAS or BRAF mutations, failed to demonstrate clinical activity in the population analyzed. BACKGROUND:Patients with RAS- or BRAF-mutated (mut) metastatic colorectal cancer (mCRC) progressing on first-line bevacizumab plus 5-FU/irinotecan/oxaliplatin (FOLFOXIRI) have a poor prognosis. We aimed to assess the efficacy and safety of regorafenib in this population. METHODS:Regorafenib was administered daily for 3 weeks of each 4-week cycle until disease progression or other reason. The primary endpoint was 6-month progression-free survival (PFS). RESULTS:KRAS, NRAS, or BRAF was mutated in mCRC samples in 60%, 20%, and 13% of patients, respectively. Median time from initial diagnosis of metastases to the start of regorafenib and treatment duration was 13.8 months and 7 weeks, respectively. Reasons for discontinuation included disease progression (80%), investigator decision (13%), and adverse events (AEs; 7%). Seven patients (47%) required dose reduction, mostly for asthenia (43%). The most common regorafenib-related grade 3 AEs were asthenia (33%), dysphonia (13%), and hypertension (13%) (Table 1). There were no grade 4 toxicities. No patient was progression-free at 6 months. Median PFS, time to progression (TTP), and overall survival (OS) were 2.2, 2.0, and 3.3 months, respectively. CONCLUSION:Although stopped prematurely for failing to accrue, in the population analyzed, regorafenib failed to demonstrate clinical activity in KRAS- or BRAF-mutated mCRC with progression following first-line with FOLFOXIRI plus bevacizumab, although tolerability was acceptable. Our trial suggests that exploring regorafenib efficacy in an earlier line of therapy should not be undertaken without better population refinement.

Dataset Information

Regorafenib as Single Agent in Patients With Metastatic Colorectal Cancer (mCRC) With Any RAS or BRAF Mutation Previously Treated With FOLFOXIRI Plus Bevacizumab

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