My heart is with you. I am 45, have three children; boys 7 & 3, and girl 5. Last year, I went to the emergency room with severe abdominal pain, and spent 18 days in the hospital. I was/am 3C colon cancer. My family was devasted, to say the least. Stage C colorectal cancer is tough. While we are happy to not be stage D, we still face 5-year disease free survival of about 25%, and the liver is the primary site of metastisis. Many oncologists will toss around different percentages, but when you find it in writing, 25%-40% is the best anybody seems to offer. Colorectal cancer is definitely not good.
While I may or may not have active cancer in my body now, my attitude has been to fight as if I do. I can not simply wait around and hope that I am in the "lucky" group. I had chemo. Now, I am on vigorous nutritional program. Likewise, my advice to your husband would be to devise a nutritional plan and go forward. Don't wait.
I recommend that you start with a few good books. "A cancer Battle Plan", by Anne Frame, and "Antioixdants Against Cancer" by Dr. Ralph Moss are great starting point. You can get both at Amazon.