8cm LST -GM

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Hello, can anyone please help me?

I am currently having treatment for Endometrioid Ovarian and Uterine Cancer.

Diagnosed August 2024

Ascites drained, full hysterectomy, ovaries, omentum, appendix, cervix, liver scrape and diaphragm scrape. Deposits on peritoneum removed. Sept and Nov 2024.
Six cycles of chemo ended in April 2025, now in remission and taking Niarparib chemo maintenance tablets.

Before my ovarian cancer I was also referred to Gastro team as positive fit test and blood in stool.
Colonoscopy in Nov 2024 showed a laterally spreading polyp in my rectum of 3 cm. (LST-Gm) This appeared benign but could not be snared out so treatment put on hold until after chemo.

Fast forward to August 2025 when another colonoscopy showed the polyp had grown from 3cm to 8cm. No worrying signs.

I am due to have this polyp removed by ESD soon but am not convinced that this polyp isn’t cancerous. MRI scan showed nothing other than polyp.
Everything I’ve read about polyps says they take years to grow so why has mine grown to a giant size in a few months?

Has anyone experienced similar diagnosis and can offer any reassurance as I’m going out of my mind with worry.

Sorry for long post and thanks for bearing with me xxx

Susan13 1 day ago

Traditionally, bowel cancer is very slow growing. So the speed of growth argues against malignancy. I think the polyp information includes the slow growing cancers and may not be accurate for noncancerous growths.

The fact that they aren't concerned is also good news. When they looked at my tumor, the doctor could tell it was cancer. They waited on the biopsy to make it official but they knew and talked to me like they were sure.

That said, yes it is possible to get a faster growing colorectal cancer. Mine was exceptionally fast growing. But I have yet to meet anyone else with a fast growing colorectal cancer so I think this is exceedingly rare.

If you had a PET scan as part of your ovarian cancer work up, I would expect that any cancer in your colon would have been detected at that time. If you had the scan and no cancer was identified in the colon, that should be very reassuring.

Good luck to you! I hope your ovarian cancer stays in remission. My sister has ovarian cancer and has really struggled so it's nice to meet someone in remission.