D07001 Softgel-Capsules and Capecitabine Combination Therapy in Patients With Advanced Biliary Tract Cancer

This is a Phase III, randomized, double-blind, multicenter, placebo-controlled, parallel-group study to evaluate the efficacy and safety of D07001-softgel capsules + capecitabine tablets in participants with advanced BTC after failure on an intravenous gemcitabine and cisplatin-based, and also failed on or refused FOLFOX or failed on irinotecan and fluorouracil regimen. Approximately 195 participants (approximately 65 per treatment arm) will be randomized 1:1:1 to one of the following treatment arms: * Oral D07001 softgel capsules, 100 mg/day + capecitabine tablets (1000 mg/m2 twice daily \[bid\]) * Oral D07001 softgel capsules, 60 mg/day + capecitabine tablets (1000 mg/m2 bid) * Oral placebo softgel capsules + capecitabine tablets (1000 mg/m2 bid) A formal interim futility analysis will be conducted when approximately 80 participants have either experienced disease progression or death. Study participants will continue study treatment until unacceptable toxicity, disease progression, death, withdrawal of consent to treatment, or completing 12 treatment cycles, whichever comes first. The EOT Visit will occur following unacceptable toxicity, disease progression, completing 12 treatment cycles or withdrawal of consent to treatment. Follow-up Period/Visits over phone call will be conducted for participants on 30 ± 3 days, every month; and at 365 ± 3 days following the EOT Visit.