NRG-GI008 Colon Cancer

What is the Purpose of this Study?

We are doing this study to find out if a blood test for circulating tumor DNA (ctDNA) can provide information that might help doctors figure out the most appropriate therapy for patients with colon cancer after they have surgery.

What is the Condition Being Studied?

Colon Cancer

Who Can Participate in the Study?

Adults ages 18+ who:

  • Are diagnosed with Stage II or III adenocarcinoma of the colon
  • Have had their tumor removed by surgery fewer than 60 days before joining the study

For more information about who can join this study, please contact the study team at

Age Group

What is Involved?

If you choose to join this study, we will test your blood for ctDNA, even if you've already had a previous Signatera test to check for the presence of ctDNA.

If your ctDNA test is positive, you will begin taking a standard chemotherapy regimen.

If your ctDNA test is negative, you will get a random assignment (like a coin flip) to 1 of 2 groups:

  • One group will not start a chemotherapy regimen and will have their ctDNA routinely checked (the first test will be 3 months after joining the study, and then every 6 months for 4.5 years)
  • The other group will start a standard chemotherapy regimen

If you are assigned to the group that receives ctDNA monitoring but not chemotherapy, you will be started on a standard chemotherapy regimen if you ever have a positive ctDNA test during your monitoring period.

Study Details

Full Title
NRG-GI008: Colon Adjuvant Chemotherapy Based on Evaluation of Residual Disease (CIRCULATE-US)
Principal Investigator
Clinical Associate in the Department of Medicine
Protocol Number
IRB: PRO00112650
NCT: NCT05174169
Phase II/III
Enrollment Status