The drug dose that taken by the subject is gradually increased to the maximum dose tolerated by the patient according to individualization. Specifically, the initial dose of 80 mg/day was gradually increased to 120 mg/day (80 mg/day in the first week, 120 mg/day in the second week, and a maximum tolerated dose of 160 mg/day). The maximum tolerated dose is 160 mg/day. The dose is administered once daily in a 4-week cycle (3 weeks of dosing and 1 week of rest) and the maximum dose achieved in the first treatment cycle is maintained.At the discretion of the investigator, regorafenib may be delayed or discontinued. Dose adjustments and interruptions due to toxicity are made according to the recommendations specified in the protocol.

The drug dose that taken by the subject is gradually increased to the maximum dose tolerated by the patient according to individualization. Specifically, the initial dose of 80 mg/day was gradually increased to 120 mg/day (80 mg/day in the first week, 120 mg/day in the second week, and a maximum tolerated dose of 160 mg/day). The maximum tolerated dose is 160 mg/day. The dose is administered once daily in a 4-week cycle (3 weeks of dosing and 1 week of rest) and the maximum dose achieved in the first treatment cycle is maintained.At the discretion of the investigator, regorafenib may be delayed or discontinued. Dose adjustments and interruptions due to toxicity are made according to the recommendations specified in the protocol.

From second-line treatment initiation to third disease progression

Subjects were censored from the time of enrollment to the time of death from any cause, and the date of censoring was the date of the last follow-up visit if the subject's last status was alive.