This is a Phase 1, open-label study evaluating the mass balance of FTD and TPI after a single dose of TAS-102 with a light tracer dose of [14C]FTD or [14C]TPI. The study will be conducted in 2 parts: mass balance part and TAS-102 extension part. After completion of the mass balance part, patients will receive continued treatment with TAS-102 during the study extension part.
The purpose of this study is to evaluate, in patients with advanced solid tumors, the mass balance of FTD and TPI after a single dose of TAS-102 with a light tracer dose of [14C]FTD or [14C]TPI.