A Clinical Trial of Durvalumab and Tremelimumab, Administered With Radiation Therapy or Ablation in Patients With Colorectal Cancer

Inclusion Criteria

• Be willing and able to provide written informed consent for the trial.
• Histologically- or cytologically- confirmed CRC.
• Metastatic CRC.
• Subjects have received at least two standard chemotherapy regimens for which they would be considered eligible (at least one containing a 5-fluoropyrimidine), or systemic chemotherapy is not indicated in the setting of low volume metastatic disease.
• At least one tumor for which palliative RT is considered appropriate standard therapy (cohort 1); or, at least one tumor for which palliative ablation is considered appropriate standard therapy (cohort 2).
• At least one index lesion that will not undergo RT or ablation, and which is measurable based on RECIST 1.1.
• Be ≥ 18 years of age on day of signing informed consent.
• Consent for tumor biopsies (for patients enrolled in stage 1 only) and blood draws for research purposes (for all patients).
• Consent for use of available archived tissue and tumor obtained during a standard procedure, for research purposes.
• Have a performance status of 0 or 1 on the ECOG Performance Scale.
• Female subjects must either be of non-reproductive potential (i.e., post-menopausal by history: ≥60 years old and no menses for ≥ 1 year without an alternative medical cause; OR history of hysterectomy, OR history of bilateral tubal ligation, OR history of bilateral oophorectomy) or must have a negative serum pregnancy test within 2 weeks prior to starting treatment.
• Demonstrate adequate organ function as defined all screening labs should be performed within 4 weeks prior to treatment initiation.
• Hemoglobin ≥ 8.0 g/dL
• Absolute neutrophil count (ANC) ≥1,500 /mcL
• Platelets ≥100,000 / mcL
• Serum creatinine ≤1.5 X upper limit of normal (ULN) OR
• Measured or calculated creatinine clearance (GFR can also be used in place of creatinine or CrCl) OR
• Serum creatinine CL>40 mL/min by the Cockcroft-Gault formula (Cockcroft and Gault 1976) or by 24-hour urine collection for determination of creatinine clearance.
• Serum total bilirubin ≤ 1.5 X ULN OR Direct bilirubin ≤ ULN for subjects with total bilirubin levels > 1.5 ULN
• AST (SGOT) and ALT (SGPT) ≤ 2.5 X ULN OR ≤ 5 X ULN for subjects with liver metastases.

aCreatinine clearance should be calculated per institutional standard.

Exclusion Criteria

• Is currently participating in or has participated in a study of an investigational agent or using an investigational device within 4 weeks of the first dose of treatment.
• Chemotherapy, monoclonal antibody, targeted small molecule therapy, within 4 weeks prior to dose #1 or who has not recovered (i.e., ≤ Grade 1 or at baseline) from adverse events due to a previously administered agent (excluding alopecia or toxicity not anticipated to interfere with planned treatment on study).
• Known or suspected MSI-H CRC.
• Any prior Grade ≥3 immune-related adverse event (irAE) while receiving any previous immunotherapy agent, or any unresolved irAE >Grade 1, including anti-PD-1, anti-PD-L1, anti-CD137, anti-CTLA-4 antibody or any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways, except for endocrinopathies and asymptomatic amylase/lipase.
• If subject received major surgery, they must have recovered adequately from the toxicity and/or complications from the intervention per clinical discretion of the investigator prior to starting therapy.
• Concurrent active malignancy that requires systemic treatment.
• Known CNS metastases and/or carcinomatous meningitis. Subjects with previously treated brain metastases may participate provided they are stable without evidence of new or enlarging brain metastases, and are not using steroids for at least 7 days prior to trial treatment. The use of topical steroids is permitted.
• Active autoimmune disease requiring systemic immune suppressive treatment within the past 2 years. NOTE: Subjects with vitiligo, Grave's disease, or psoriasis not requiring systemic treatment (wi