The primary objective of this study is to collect de-identified, clinically-characterized stool and whole blood specimens for use in developing and evaluating the performance of new biomarker assays for the detection of colorectal cancer (CRC).

Participants will be 40 years of age or older, with a diagnosis of CRC, at any stage, confirmed with a tissue biopsy or a colorectal lesion at least 1 cm in size suspicious for adenoma (including sessile serrated adenoma) or CRC on a pre-enrollment colonoscopy, sigmoidoscopy, or computed tomography (CT) colonography. Approximately 1500 participants will be enrolled.

Inclusion Criteria:

1. Participant is 40 years of age or older.
2. Participant has a diagnosis of CRC, at any stage, confirmed with a tissue biopsy or a colorectal lesion at least 1 cm in size suspicious for adenoma (including sessile serrated adenoma) or CRC on a pre-enrollment colonoscopy, sigmoidoscopy, or CT colonography.
3. Postcolonoscopy, the residual lesion in the colon must be at least 1 cm in size as to require additional surgical excision or complex colonoscopic polypectomy.
4. Participant understands the study procedures and is able to provide informed consent to take part in the study and authorization for release of relevant protected health information to the study Investigator.

Exclusion Criteria:

1. Any previous cancer diagnosis (with the exceptions of basal cell or squamous cell skin cancers) and/or cancer related treatment (e.g., chemotherapy, immunotherapy, radiation, and/or surgery) within the past 5 years.
2. Less than 7 days between colonoscopy and blood and/or stool specimen collection.
3. IV contrast (e.g., CT or MRI) within 1 day [or 24 hours] before blood and/or stool collection.
4. Participant has any condition that in the opinion of the Investigator should preclude taking part in the study.

Approximately 1500 subjects will be enrolled. Participants will be 40 years of age or older, with a diagnosis of CRC, at any stage, confirmed with a tissue biopsy or a colorectal lesion at least 1 cm in size suspicious for adenoma (including sessile serrated adenoma) or CRC on a pre-enrollment colonoscopy, sigmoidoscopy, or computed tomography (CT) colonography.