Regorafenib in older adults with metastatic colorectal cancer: A multi-center, single arm phase II trial - Zittel, Jason; Baran, Andrea M.; Dotan, Efrat; Hubbard, Joleen M.; Noel, Marcus Smith; Hezel, Aram F; Tejani, Mohamedtaki Abdulaziz; Mohile, Supriya Gupta (Journal of clinical oncology, 2023)