My brother of 50 was diagnosed with stage 4 bowel cancer 3 months ago spread to his liver and peritoneum. He had 2 colonoscopies to get results and we were told adenocarcinoma not amenable to immunotherapy. He has started his chemo and had 2 rounds. The last round has been put off a week but he has received an appointment notification for an FNA biopsy of his liver. We’re confused as to why they want to perform a potentially risky procedure when we know it’s stage 4 and an adenocarcinoma. What good could this do. We also have not had any discussion about this plan as he’s in the middle of his treatment and we will not know how he’s responded without repeat scans. Can yo please advise as to possible reasoning behind this plan? Thank you