Durvalumab for MSI-H or POLE Mutated Metastatic Colorectal Cancer

"Study treatment consists of durvalumab 1500 mg Q4W for patients \> 30 kg, and will be repeated every 4 weeks. For patients ≤ 30 kg, weight based dosing of 20 mg/kg durvalumab Q4W will be used.~Response evaluation will be performed every 8 weeks (± 1-week window period). Treatment will be continued until disease progression, unacceptable adverse events or the patient's refusal.~Treatment through progression is at the investigator's discretion, and the investigator should ensure that patients do not have any significant, unacceptable, or irreversible toxicity that indicate that continuing treatment will not further benefit the patient. The Investigator should ensure that patients still meet all of the inclusion criteria and none of the exclusion criteria for this study."