My pathology report states T4a N2a M1c......all the charts I find state M1a and M1b.....is there a M1c? Found something on it Colon Cancer Staging Updated: Jan 09, 2018 | Author: Lewis J Rose, MD; Chief Editor: N Joseph Espat, MD, MS, FACS more... https://emedicine.medscape.com/article/2006674-overv...