Please dont panic. he will do fine.
Thanks for the query and also thanks for providing the reports.
According to the CT scan
the growth is in the sigmoid colon
and not in the rectum (we call it - above the peritoneal reflection). In such cases, surgery is the first choice of treatment as was correctly done in your case.
According to the Histopathology report, it is stage III disease. The chemo he is receiving is also the current standard of care. Chemotherapy
is associated with complications, but they can be managed. Your medical oncologist
will take care of that.
As per definition, your father's tumor qualifies as colon cancer
and not rectal cancer
. There is no need for radiation
as per the reports that you have provided. Only the operating surgeon will be able to tell you whether the tumor had extended to the rectum based on his operative findings (i.e. if it has gone below the peritoneal reflection). If he says radiation is not necessary, then it is not necessary.
8 cycles of chemtherapy are better than 6 if he can tolerate them.
I hope I have answered your query. Please get back incase you have any other queries.