The purpose of this study is to determine the feasibility of establishing patient-derived organoids from pre-treatment rectal adenocarcinoma biopsies.

Inclusion

1. Age ≥18 years old.
2. Able to provide informed consent.
3. Undergoing proctoscopy.

Exclusion

1. Patient not planned to receive neoadjuvant radiotherapy

Data and organoids may be shared with other researchers

6 months after publication

Researchers should request data and/or organoid lines from the principal investigator

Adverse Event data was not collected.

Adverse Event data was not collected.