Brief Answer:
.
Detailed Answer:
Yes,
pancreas cancer is ruled out with CT. You should forget about this cancer.
Colon cancer in the family is a risk factor if your sister was younger than 50 when it was diagnosed. You should have
colonoscopy 10 years earlier than your sister diagnose age.
Regular FOBT test should be done 3 times. Before this test, you should not eat meat for 3 days.
Immunoassay FOBT is a better one and allows to assume that you are free of blood in the stool. But there is always a possibility of some small lesion in large intestine (polyps) which needs to be removed. So colonoscopy seems advisable.
If its about your
abdominal pain, as all other things seems to be rule out, gastroscopy is a next step to see stomach condition.
Intermittent pain does not indicate anything significant. Every person has abdominal pain from time to time and usually it does not point to a cancer.
In conclusion, please do not worry about cancer. Pancreas cancer is very rare and as you have CT seems hardly possible at your case. Colon cancer grows about 10 years and abdominal pain is not specific symptoms. Before the pain usually
blood in stool, weakness, bloating,
constipation appear. As you havent mentioned any of these symptoms, your FOBTs are negative, the risk of colon cancer is also very low. So please treat colonoscopy as a precaution.
Hope this will help.
Regards.