CEA and CA-19-9 Dynamics Associate with Survival in Regorafenib-Treated Metastatic Colorectal Cancer: A Real-World Analysis. - Yalçıner, Merih; Örüncü, Mehmet Berk; Kayaalp, Mehmet; Erdat, Efe Cem; Kavak, Engin Eren; Utkan, Güngör (Journal of Clinical Medicine, 2026)