Promising surgical techniques are still in clinical trials. Surgery in general is vastly improved over 20 years ago. The incidence is decreasing, for women more rapidly than for men. The difference in decrease between men and women is more striking for colon cancer than for rectal cancer. There is a geographic gradient in which, as you proceed away from the equator either northward or southward to areas of less sunlight, increasingly higher rates of colorectal cancer are found.
Colorectal cancer is virtually nonexistent at the equator.
But rates of colorectal cancer are also lower among those who take a daily vitamin that contains vitamin D, calcium, and folic acid. It's also possible that colorectal cancer is decreasing more rapidly among women than men because of the use of estrogen by women. That, and an increased use of birth control pills. They have to be vigilant. That's even true for people with an ostomy.