Pyrotinib in Combination With Trastuzumab in Treatment-refractory, HER2-positive Metastatic Colorectal Cancar.

Inclusion Criteria: Patients should be histologically diagnosed with metastatic colorectal cancer or postoperative recurrence; Patients with ALK mutation(including mutation, fusion, rearrangements ); Patients have measurable lesions; Patients are not available for targeted therapy or patients refuse to receive targeted therapy afer second-line treatment; Over 3 weeks after radiotherapy and the radiotherapy focus was not be measured; Age should be 18-25 years; Performance status should be 0-2; Life expectancy should be more than 12 weeks; Exclusion Criteria: Patients underwented major surgery or severe trauma within 4 weeks; Patients allergiced to experimental drugs; Patient ready to give birth or who is pregnant; Patients with brain metastases; Patients with chemotherapy contraindication; Patients could not tolerate chemotherapy; Patients have secondary primary tumor.