Overview

Following systemic therapy in metastatic colorectal cancer(mCRC),RAS (including KRAS, NRAS and HRAS gene) status may change from a mutant(MT) to a wild-type(WT),a phenomenon known as "NeoRAS WT"mCRC.NeoRAS WT can be detected by longitudinal circulating tumor DNA(ctDNA) analysis.Therefore, this prospective phase II Study was design to explore the detection rate of peripheral blood ctDNA testing for NeoRAS WT and its guiding value for subsequent treatment for mCRC.

Eligibility

Inclusion Criteria:

1. Metastatic colorectal cancer with tissue RAS mutation-type;
2. ECOG (Eastern Cooperative Oncology Group) performance score is 0-1;
3. Obtaining informed consent;
4. Surgical specimens or punctured tissue specimens containing tumors can be obtained; 10ml of peripheral blood can be obtained

Exclusion Criteria:

1. The pathology was not confirmed by colonoscopy biopsy or biopsy of metastasis;
2. Colorectal cancer patients with clinical stage I-III;Patients with RAS wild-type metastatic colorectal cancer confirmed by histological genetic testing;Lack of adequate organ functions, such as severe abnormalities in blood, liver and kidney function