Colorectal Cancer

Why would CT scan show cancer spread but PET scan show none?

My son was diagnosed with stage 4 colon cancer in April, 2025. After 12 rounds of chemo the doctor did a CT scan to check progress. Told us results showed tumor in colon smaller but tumors in peritoneal area around abdomen larger and has some new ones plus possible lymph nodes involvement. Did a PET scan a couple weeks later and now says results of PET scan show no cancer except tumor still present in colon. I want to be happy about this news but don't understand how the CT scan and the PET scan can be so different. Has anyone seen this. Which test do we trust?

What to expect after colon cancer surgery with liver involvement?

Hi everyone! Was diagnosed 10/16/25 with colorectal cancer. Surgery was 10/31 to remove ascending colon, appendix, gall bladder and several lymph nodes. Also found concern on liver and biopsies of all listed above were positive cancers. Not a lot more info just yet, other than my Dr mentioned stage 4. Have had extreme back and side pain since surgery, with low energy and fatigue. Waiting for initial oncologist appointment....anyone here with similar ?

Has anyone had a positive Signatera blood test after being cancer free?

I was diagnosed with stage 3c colorectal cancel in July 2024. I had surgery in August 2024 and started chemotherapy Sept 2024. By Feb 2025 I developed chemo induced toxicity and soentb2 weeks in hospital. But they said I was cancer free because if I was this sick so was the cancer. Since then I've had 2 CT scans and 3 signatera blood tests to test for tumor DNA. The 1st 2 came back negative (no tumor DNA) but the latest one came back with 1.54 MTM/ml. My oncologist wants to retest on Dec 1st but I don't know much more about this test except it test for tumor DNA in my blood and that could signal a recurrence of the cancer. Has anyone else had this test and had a positive result?

What to do when you lose your taste and can't eat?

What do you do when you lose your taste? I can't taste anything hardly. Makes it so hard to eat .

How do I understand my cancer pathology reports and test results?

Hello everyone, i am a 60 year old grandma. I had a colonoscopy on 8/21/25 where cancer was found. On 9/9/25 colon resection - sigmoid/part of rectal. I had 19 lymph nodes removed, 11 were infected. Pathology report staged it as cancer stage 3 c aggressive is what I understand so far. On 10/9/25 port placement and on 11/17/25 start flofox chemotherapy. Chemo was delayed twice because I got sick back to back with sinus infection then bronchitis. I would love to learn how to understand and read my reports. Like what are my biomarkers then what does that mean? What kind of test and what the test I took means. What can I do? Etc, instead of going down the rabbit hole. UPDATE: went to my first chemotherapy, found out I’m a stage IV. I currently have the following: • A lung nodule that grew from 7 mm → 1.4 cm (I had bronchitis so it may have accelerated- didn’t ask doctor) • A liver metastasis that is 3 cm • Additional smaller liver metastases also present • Original Signatera = 5

What should I know about Vetabix for cancer treatment?

Please share info on vetabix

How can I manage severe leg pain from chemo treatments?

I have colon cancer .For 2 and half years.My colon cancer has not given me pain but all the chemo I have cause cause me alot of pain in my legs.

How did others do on Keytruda immunotherapy for colon cancer?

I just had my first chemo today. Immunotherapy using Keytuda. I’m interested how other people have done on this. I have 1 tumor on my asending colon but have lymph node involvement. I’ve heard good stuff about this product but it is very expensive

How to manage severe rectal pain that makes sitting and bowel movements unbearable?

What are people doing for pain mine is in the lower part of rectum and it hurts just to even sit but a bowl movement is awful