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The multikinase inhibitor regorafenib improved overall survival in the phase III CORRECT and CONCUR trials in heavily pretreated patients with treatment-refractory metastatic colorectal cancer (mCRC). Exploratory subgroup analysis from CONCUR suggested that regorafenib treatment prior to targeted therapy (including bevacizumab) may improve outcomes. In this single-center, single-arm phase IIb study, regorafenib demonstrated antitumor activity in 59 antiangiogenic-naïve patients with chemotherapy-refractory mCRC. Further studies should assess the efficacy of regorafenib in this patient population, as well as explore the reasons behind improved outcomes among patients who had a metabolic response and those who developed hand-foot skin reaction.
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Riechelmann et al. (2019) studied this question.
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