DarknessEmbraced, Skimom and Ginny, thanks for your kind words.
Regarding Ginny's question on tumor marker ca19.9
CEA is typically the most specific marker for CRC, but it also can be raised by inflammation and/or liver stress (the liver cleans up CEA)
CA19.9 is typically used for Pancreatic Cancer but when CA199 is elevated it often indicates CRC presence or progression.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8006010/
I also get another marker, CA125, which is a marker mostly used for ovarian cancer but it seems to also increase when for CRC specially in the presence of Peritoneal dissemination (i.e. when the colon cancer invades the peritoneum) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5134852/https://pubmed.ncbi.nlm.nih.gov/33935125/
Hope this helps, Best regards