This open label, multicenter study will be conducted in 2 stages: a dose-finding stage (Phase IIa) and a dose-expansion stage (Phase IIb/III).~In phase IIa, eligible patients will be assigned to receive oral D07001-softgel on Days 1, 3, 5, 8, 10, 12, 15, 17, and 19 of a 21-day cycle (9 doses per cycle) and Xeloda (or TS-1) twice daily on Day 1-14 of a 21-day cycle.~A modified 3+3 dose-finding design method will be applied to identify dose-limiting toxicities (DLTs) and establish the selected dose of D07001-softgel capsules plus Xeloda (or TS-1).~In phase IIb/III,the first 40 subjects (20 subjects per arm) will be randomly allocated in a 1:1 ratio in two arms. Arm A will receive active symptom control (ASC) with the selected dose from dose-finding stage of D07001-softgel capsules and Xeloda (or TS-1), in 21-day cycles. In arm B, subjects will receive ASC with mFOLFOX treatment. After the last subject of first 40 subjects will be completed the visit in the end of treatment, an adaptive interim analysis will be planned to re-estimate the required sample size based on the result of DCR if needed. The sponsor team will determine whether the study will be continued or stopped for futility.~If the study continues to proceed, the total subject number will be based on the decision from the results of interim study. The rest of subjects will be randomized to receive the combination of study drug or active-control drug with the same allocation in two arms. Both groups will continue the therapy until disease progression, withdrawn consent, or when another treatment discontinuation criterion is met.
The primary objective are:~To assess the safety and tolerability of the combination of D07001-softgel capsules and Xeloda/TS-1.~To evaluate the efficacy of the combination of D07001-softgel capsules and Xeloda/TS-1, as assessed by disease control rate (DCR).