The survey is a retrospective study to evaluate the prognotic value of EGFR expression, KRAS mutations and tumor sideness in patients with metastatic colorectal cancer treated with regorafenib and FOLFIRI as a third- or fourth-line setting.

Primary objective:

Progression-free survival

Secondary objecive:

Overall survival, best objective response, disease control rate and adverse events

Number of Subjects: 41 patients with metastatic colorectal cancer treated with regorafenib and FOLFIRI as a third- or fourth-line setting.

Plan of the Study:

1. This is a retrospective study.
2. Study Schedule Study date: the time getting approval letter issued by both regulatory authority and institutional review board (IRB). Duration of the study: 5 years.
3. Duration of Treatment: Treatment was administered until disease progressed.

Inclusion Criteria:

• Age between 20-85 years old
• Histologically proven metastatic colorectal cancer (mCRC).
• Patients with progressing mCRC who were previously treated with FOLFOX, FOLFIRI, anti-VGFR monoclonal antibody (MoAb), and anti-EGFR MoAb if KRAS-wild-type tumors were identified.
• Patient was able to understand the requirements of the study and written informed consent was obtained from each subject.

Exclusion Criteria:

• Patients who do not meet the including criteria or unwilling to participate