Colorectal polyps cancer

All of the following statements are true regarding colorectal cancer EXCEPT:

1: Carcinoembryonic antigen is used as a marker to screen for and diagnose colorectal cancer.
2: COX-2 inhibition has been associated with lower rates of colon cancer.
3: Serrated polyps and adenomas are more likely to transform into malignancy as compared to hamartomatous and hyperplastic polyps.
4: Ulcerative colitis increases the risk for colorectal cancer.