RecruitingPhase 2Drug trialTAS-102 With or Without Celecoxib in ctDNA-defined Minimal Residual Disease in Colorectal Cancer After Completion of Adjuvant ChemotherapyTo measure the level of circulating tumor DNA (ctDNA) in the blood of colorectal cancer patients after 6 months of receiving TAS-102 therapy. ctDNA is genetic material from tumor cells that can be found and measured in the blood.